JP2015027262A - Method for raising cutting seedlings of forest trees - Google Patents
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Abstract
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本発明は山林樹木挿し木苗を効率的に製造（生産）する方法に関する。 The present invention relates to a method for efficiently producing (producing) mountain forest tree cuttings.
我が国におけるスギ、ヒノキ等の山林樹木苗の生産は、露地又は温室等の施設内において実生で行われるほか、挿し木によって行われる。
一方、海外の林業先進国では、樹木苗木育成用のコンテナを用いるコンテナ育苗技術の技術が確立され、近年、わが国でも国内林業向けのマルチキャビティコンテナが開発され普及が拡大している。樹木苗木育成用のコンテナは多数の苗育成孔を有する硬質プラスティック製の育苗容器であり、樹種、育苗環境、作業性に応じて、容量、形状等様々なタイプがある。
コンテナ育苗のメリットは、（i）低コストであること、（ii）貯蔵や運搬などのハンドリングに優れること、（iii）培地付き苗なので植栽適期の拡大が可能であること、（iv）小型軽量のため植栽効率が高いこと等があげられる。
挿し木育苗において、育苗用コンテナを用いる場合は、台木（母樹）の穂を含む部分を切り取り（切り取られた部分を「挿し穂」という）、該挿し穂をコンテナに充填された挿し床に直接挿し木するか、あるいは露地から床替えした穂を挿し木して発根させ、育苗する方法が採られる。かかる方法による育苗（以下「挿し木育苗」という）においては、挿し穂を約２００本／ｍ２以上の高い密度で生育せしめるといった面積当たり生産量を高める育苗が可能である（露地育苗では100本/m2程度）。なお、挿し木（又は挿し付け）とは、挿し穂を植え付ける工程を意味する。
In Japan, forest tree seedlings such as cedar and cypress are produced by seedlings in open-air facilities or greenhouses, and by cuttings.
On the other hand, in overseas forestry advanced countries, container seedling technology using containers for growing tree seedlings has been established. In recent years, multi-cavity containers for domestic forestry have been developed and spread in Japan. A container for tree seedling growing is a hard plastic seedling container having a large number of seedling growing holes, and there are various types such as capacity and shape according to tree species, seedling environment and workability.
Advantages of container seedlings are (i) low cost, (ii) excellent handling such as storage and transportation, (iii) the seedling with medium can expand the optimal planting time, and (iv) small size The planting efficiency is high due to its light weight.
In the case of using a container for raising seedlings in cutting seedlings, cut off the part of the rootstock (mother tree) containing the ears (the cut part is called "inserting ear") and place the cuttings directly on the insertion floor filled in the container. A method of cutting or raising seedlings that have been cut from the ground or by cutting the roots and raising seedlings is employed. In raising seedlings by this method (hereinafter referred to as “cutting seedling raising seedlings”), it is possible to raise seedlings that increase the production per area, such as growing cuttings at a high density of about 200 / m 2 or more (100 / m 2 ). In addition, cutting (or insertion) means the process of planting cuttings.
挿し付け直後の挿し穂は、根を有しないため水分の吸収能が低い一方、蒸散は活発に行われるため、水分収支がアンバランスであり挿し穂内における水分は不足しやすい。そのため挿し木育苗においては、発根するまで、挿し木後の挿し穂における水分の亡失を防ぐことが、最も重要な管理項目の一つである。とくに夏場は挿し穂の蒸散・光合成が活発であるため、水分収支が一層アンバランスになりがちである。 The cuttings immediately after insertion do not have roots and thus have a low water absorption capacity. However, since transpiration is actively performed, the moisture balance is unbalanced, and the moisture in the insertions tends to be insufficient. Therefore, in cutting seedlings, it is one of the most important management items to prevent the loss of water in the cuttings after cutting until rooting. Especially in summer, the water balance tends to become more unbalanced due to active transpiration and photosynthesis.
一般的な挿し木育苗では、挿し穂における水分の亡失を防ぐために、温度、湿度、光といった、主に蒸散を抑える地上部の環境要因の制御が行われる。特に潅水管理は、穂の上部にのみ霧状のミストを与えること（頭上潅水）によって穂からの蒸散の抑制、適度な水分供給が行われる。
更に、ミストの頭上潅水を行うに際しては、ミストを与えすぎると培土（培地）の表面付近、すなわち挿し穂の地上部の基部付近が過湿状態になり、病気が発生しやすくなる（非特許文献１）。そのため、当該箇所が過湿にならないようにする湿度コントロールも不可欠である。
In general cuttings raising seedlings, in order to prevent the loss of moisture in the cuttings, environmental factors such as temperature, humidity, light, etc., which mainly suppress transpiration are controlled. In particular, in the irrigation management, mist-like mist is given only to the upper part of the ear (overhead irrigation) to suppress transpiration from the ear and to supply an appropriate amount of water.
Furthermore, when performing irrigation of the mist overhead, if too much mist is applied, the vicinity of the surface of the soil (medium), that is, the vicinity of the base of the above-ground part of the cutting head becomes overhumid, and disease is likely to occur (non-patent document). 1). For this reason, it is also indispensable to control the humidity so that the portion does not become excessively humid.
挿し木苗の大量生産においては、面積当たりの挿し付け密度が高いため、頭上潅水において過湿を避けようとすると培土に均等に水が行き渡らず、培土の部位間における含水率のバラつきが大きくなりやすい。とくに、近年普及しているコンテナを用いる場合には、一株に与えられる培土の量が小さいこともあり、培土が乾燥しやすい。側面にスリットが刻まれたコンテナにおいては、培土が一層乾燥しやすい。そのため、コンテナを用いる育苗においては、湿度コントロールは一層困難である。
すなわち、挿し穂からの蒸散を抑制し、かつ挿し穂の地上部の基部付近を過湿状態にしないようにするためには、潅水管理及び温湿度管理による水分環境の制御が必要であるが、かかる制御はきめ細かく、特に山林樹苗の育苗では長期間（約３ヶ月）にわたり行わなければならず、煩雑であるうえに労力を要するのが現状である。
In mass production of cutting seedlings, the insertion density per area is high, so if you try to avoid over-humidity during overhead irrigation, water will not spread evenly over the soil, and the water content will vary widely between the soil sites . In particular, in the case of using a container that has been widely used in recent years, the amount of soil provided to one stock may be small, and the soil is easily dried. In containers with slits on the sides, the soil is more dry. Therefore, humidity control is more difficult for seedlings using containers.
That is, in order to suppress the transpiration from the cuttings and to prevent the vicinity of the base of the above-ground part of the cuttings from being overhumid, it is necessary to control the water environment by irrigation management and temperature and humidity management, Such control is fine, especially for raising seedlings of mountain forest trees, and must be performed over a long period (about 3 months), which is complicated and labor-intensive.
したがって、本発明は、山林樹木挿し木苗の生産において、より簡便に水分環境を制御することを可能とする方法を与えることを目的とする。 Therefore, an object of the present invention is to provide a method that makes it possible to more easily control the water environment in the production of mountain forest tree cuttings.
本発明者らは、上記課題の解決を志向して、環境を制御するより簡便な方法について研究を行ったところ、驚くべきことに潅水の方法を変更することによって水分環境のコントロールがより簡便に行い得る可能性があることを見出し、さらに研究を進めた結果本発明を完成するに至った。
すなわち本発明は、少なくとも以下の発明に関する：
［１］ 以下の工程を含む、山林樹木挿し木苗を製造する方法：
（１）発根前の挿し穂を、高密度で培土に栽植する工程；
（２）前記培土の底面から潅水して、前記挿し穂の切り口に水分を供給する工程；及び
（３）挿し穂を発根させ、施設内及び屋外において山林樹木挿し木苗を育苗する工程。
The inventors of the present invention have conducted research on a simpler method for controlling the environment in order to solve the above-mentioned problems, and surprisingly, the water environment can be more easily controlled by changing the irrigation method. As a result of further finding out that there is a possibility of being able to do it, the present invention has been completed.
That is, the present invention relates to at least the following inventions:
[1] A method for producing a mountain forest tree cutting seedling including the following steps:
(1) A process of planting cuttings before rooting at high density on the cultivation soil;
(2) irrigating from the bottom of the cultivated soil and supplying moisture to the cut end of the cutting ear; and (3) rooting the cutting tip and raising a mountain forest tree cutting seedling in the facility and outdoors.
［２］挿し穂が発根した後に、培土の底面からの潅水を行わない前記［１］の方法。 [2] The method according to [1] above, wherein irrigation from the bottom of the soil is not performed after the cuttings have rooted.
［３］ 以下の工程を含む、山林樹木挿し木苗を製造する方法：
（１）発根前の挿し穂を高密度で培土に栽植する工程；
（２）前記培土の底面から潅水して、前記挿し穂の切り口に水分を供給する工程；及び
（３’）挿し穂を発根させ、発根した後に、培土の底面からの潅水を停止し、頭上潅水を行って前記発根後の挿し穂を施設内及び屋外において山林樹木挿し木苗を育苗する工程。
［４］培土の底面からの潅水を、培土を水に浸漬して行う、前記［１］〜［３］のいずれかの方法。
［５］水に浸漬される培土の高さが、培土全体の高さの３％以上、４０％以下に保たれる、前記［４］の方法。
［６］山林樹木がスギ又はヒノキである前記［１］〜［５］のいずれかの方法。
［７］挿し穂の栽植密度が約２００本／ｍ２以上である前記［１］〜［６］のいずれかの方法。
［８］栽植が、コンテナに入れた培土に行われる前記［１］〜［７］のいずれかの方法。
［９］コンテナがサイドスリット付きのコンテナである、前記［８］の方法。
［１０］前記［１］〜［９］のいずれかの方法により製造される山林樹木挿し木苗。
[3] A method for producing a mountain forest tree cutting seedling including the following steps:
(1) A process of planting cuttings before rooting at a high density on the cultivation soil;
(2) irrigating from the bottom of the soil and supplying moisture to the cut end of the cutting ear; and (3 ') irrigating from the bottom of the soil after rooting and rooting the cutting ear. The process of carrying out overhead irrigation and raising the above-mentioned rooting cuttings in the facility and outdoors in the forest forests.
[4] The method according to any one of [1] to [3], wherein the irrigation from the bottom surface of the soil is performed by immersing the soil in water.
[5] The method according to [4] above, wherein the height of the soil immersed in water is maintained at 3% or more and 40% or less of the overall height of the soil.
[6] The method according to any one of [1] to [5] above, wherein the forest tree is cedar or cypress.
[7] The method according to any one of the above [1] to [6], wherein a planting density of cuttings is about 200 / m 2 or more.
[8] The method according to any one of [1] to [7], wherein the planting is performed on the cultivated soil in a container.
[9] The method according to [8] above, wherein the container is a container with a side slit.
[10] A mountain forest tree cutting seedling produced by the method of any one of [1] to [9].
特許文献１〜３には、底面から給水・潅水するための方法・装置が示されている。しかしながら、これらの方法・装置における対象植物として、山林樹木についてはこれらの文献には記載されていないし、発根前のステージにあるものについての開示もなされていない。また、挿し木を水に浸漬することは病害の蔓延を助長し、カルス形成を阻害するため、一般的には避けるべきことであることが知られている（非特許文献２）。したがって、本発明の方法は、上記各従来技術とはまったく別異の方法であるばかりでなく、これらの技術からは想到することができないものなのである。 Patent Documents 1 to 3 show a method and apparatus for supplying and irrigating water from the bottom surface. However, as the target plants in these methods and apparatuses, mountain forest trees are not described in these documents, and those in the stage before rooting are not disclosed. In addition, it is known that soaking cuttings in water promotes the spread of disease and inhibits callus formation, and thus should generally be avoided (Non-Patent Document 2). Therefore, the method of the present invention is not only completely different from the above-described conventional techniques, but cannot be conceived from these techniques.
本発明によれば、挿し付け後から発根までの期間に挿し穂内の水分損失、あるいは挿し穂基部の過湿による枯損が抑えられ、更に山林樹木挿し木苗の発根率が総体的に向上するとともに、発根が促進され、挿し付けから発根までの期間、更に植栽までの期間を短縮することができる。したがって、本発明の方法によれば、効率的な挿し木苗の生産が可能になる。その結果本発明の方法によれば、山林樹木挿し木苗の生産において、綿密な潅水管理及び湿度管理が不要となり、施設内の水分環境をより簡便に制御することができる。
理論に束縛されるものではないが、本発明の方法によれば、培土の水分環境が一定かつ好適な状態に保たれ、挿し穂における発根が促進され、その後の旺盛な生育がもたらされると考えられる。
According to the present invention, it is possible to suppress moisture loss in the cutting head during the period from insertion to rooting, or withering of the cutting head due to overhumidity, and further improve the rooting rate of the forest tree cuttings. In addition, rooting is promoted, and the period from insertion to rooting, and further the period until planting can be shortened. Therefore, according to the method of the present invention, efficient cuttings can be produced. As a result, according to the method of the present invention, detailed irrigation management and humidity management are not required in the production of mountain forest tree cuttings, and the water environment in the facility can be controlled more easily.
Without being bound by theory, according to the method of the present invention, the moisture environment of the cultivation soil is maintained in a constant and suitable state, rooting in cuttings is promoted, and subsequent vigorous growth is brought about. Conceivable.
本発明の方法のうち挿し穂が発根した後に、培土の底面からの潅水を行わない前記方法によれば、より早期に発根させ、かつ側根及び細根を増やすことができる。 According to the method of the present invention in which irrigation from the bottom surface of the soil is not performed after the cuttings have rooted, rooting can be started earlier and the side roots and fine roots can be increased.
本発明の方法のうち培土の底面からの潅水を、培土を水に浸漬して行う、前記いずれかの方法によれば、培土の底面からの潅水を簡便に行うことができる。
本発明の方法のうち水に浸漬される培土の高さ（コンテナを用いる場合は、コンテナ底面から水面までの高さに相当）が培土全体の高さ（コンテナを用いる場合は、コンテナ全体の高さに相当）の３％以上、４０％以下に保たれる前記方法によれば、潅水をより適切に行うことができる。
本発明の方法のうち山林樹木がスギ又はヒノキである前記いずれかの方法によれば、スギ又はヒノキの山林樹木挿し木苗の生産において、簡便に水分環境を制御することができる。
本発明の方法のうち挿し穂の栽植密度が約２００本／ｍ２以上である前記いずれかの方法によれば、きわめて高い栽植密度において簡便に水分環境を制御することができる。
According to any one of the methods of the present invention, irrigation from the bottom surface of the soil is performed by immersing the culture soil in water.
In the method of the present invention, the height of the soil immersed in water (when using a container, the height from the bottom of the container to the water surface) is the height of the entire soil (when using a container, the height of the entire container According to the above method, which is maintained at 3% or more and 40% or less), irrigation can be performed more appropriately.
According to any one of the methods of the present invention in which the forest tree is a cedar or cypress, the water environment can be easily controlled in the production of a cedar or cypress forest tree cutting.
According to any one of the methods of the present invention, the planting density of cuttings is about 200 / m 2 or more, the water environment can be easily controlled at a very high planting density.
本発明の方法のうち挿し木育苗を、コンテナを用いて行う前記いずれかの方法によれば、培土の最適な水分状態を均一に保つことにより、水分不足による挿し穂の枯死を大幅に削減することができ、更には頭上からのミスト等による潅水を必要としないため、過湿による挿し穂基部の枯死を大幅に削減することができ、故に得苗率を高め、発根率を均一にすることができるため、山林樹木苗をより簡便かつ効率的に大量に生産することができる。
本発明の方法のうちコンテナがサイドスリット付きのコンテナである前記方法においては、培土乾燥を防ぎつつ、良好な根系を得ることができる。
前記いずれかの本発明の方法により製造される山林樹木挿し木苗は、水分環境を簡便に制御しつつ生産することができる。
According to any one of the methods of the present invention, in which cutting seedlings are grown using a container, the optimal moisture state of the cultivation soil is kept uniform, thereby greatly reducing the mortality of cuttings due to lack of moisture. In addition, since irrigation with mist from the overhead is not required, it is possible to drastically reduce the death of the cutting head due to overhumidity, thus increasing the yield of seedlings and making the rooting rate uniform. Therefore, it is possible to produce a large amount of mountain forest tree seedlings more easily and efficiently.
In the method of the present invention in which the container is a container with side slits, a good root system can be obtained while preventing the soil from being dried.
Mountain forest tree cuttings produced by any one of the methods of the present invention can be produced while simply controlling the water environment.
以下に本発明についてさらに詳細に説明する。
前記のとおり、本発明は以下の工程を含む、山林樹木挿し木苗を製造する方法に関する：
（１）発根前の挿し穂を、高密度で培土に栽植する工程；
（２）前記培土の底面から潅水して、前記挿し穂の切り口に水分を供給する工程；及び
（３）挿し穂を発根させ、施設内及び屋外において山林樹木挿し木苗を育苗する工程。
The present invention is described in further detail below.
As described above, the present invention relates to a method for producing a mountain forest tree cutting seedling comprising the following steps:
(1) A process of planting cuttings before rooting at high density on the cultivation soil;
(2) irrigating from the bottom of the cultivated soil and supplying moisture to the cut end of the cutting ear; and (3) rooting the cutting tip and raising a mountain forest tree cutting seedling in the facility and outdoors.
工程（１）
工程（１）は発根前の山林樹木挿し穂を、高密度で培土に栽植する工程である
本発明における山林樹木は限定されないところ、スギ、ヒノキ、クロマツ、カラマツ、エゾマツ等の針葉樹、ミズキ、サクラ、シイ、カシ、カエデ、コナラ、ハンノキ等の広葉樹、その他主として海外で植林される樹種であるアカシア、ユーカリ等が例示される。山林樹木がスギ又はヒノキである本発明の方法は好ましく、スギであるものはより好ましい。
本発明における挿し穂の大きさは限定されず、約２０ｃｍ〜約４０ｃｍであってよい。
本発明において培土の種類は限定されないところ、赤玉土、鹿沼土、ピートモス、ココピートが例示される。培土が、赤玉土主体の培土である本発明の方法は好ましい。また、培土に替えて毛管力に優れた他の媒体（マット材、保水材等）を用いてもよい。したがって、本発明における「培土」には、上記したような毛管力に優れた他の媒体も包含される。
Process (1)
The step (1) is a step of planting the pre-rooted forest forest cuttings at high density in the cultivation soil. The forest forest trees in the present invention are not limited, but conifers such as cedar, cypress, black pine, larch, and spruce, Examples include broad-leaved trees such as cherry blossom, shii, oak, maple, Japanese oak, alder, and other species such as acacia and eucalyptus that are mainly planted overseas. The method of the present invention in which the forest is a cedar or cypress is preferred, and the one that is a cedar is more preferred.
The size of the cutting head in the present invention is not limited, and may be about 20 cm to about 40 cm.
In the present invention, the type of cultivated soil is not limited, but examples include red jade soil, kanuma soil, peat moss, and cocopyt. The method of the present invention in which the cultivating soil is a cultivating soil mainly composed of red jade soil is preferable. In addition, other medium (mat material, water retention material, etc.) excellent in capillary force may be used instead of the soil. Therefore, the “culture” in the present invention includes other media having excellent capillary force as described above.
本発明における挿し木の時期は限定されず、通常の挿し木が行われる時期に挿し木を行ってよい。例えば九州地方においては３月中旬〜４月中旬に挿し付けられる春挿し、あるいは９月上旬〜１０月中旬に補完的に行われる秋挿しであってよく、冬挿しであってもよい。
本発明の方法において挿し穂の栽植密度は、高密度であれば限定されないところ、約２００本／ｍ２以上は好ましく、約２４０本／ｍ２以上はより好ましく、約３００本／ｍ２以上は一層より好ましい。なお、通常の露地における挿し穂においては、密度は約１００株／ｍ２にすぎない。
The cutting time in the present invention is not limited, and cutting may be performed at a time when normal cutting is performed. For example, in the Kyushu region, it may be spring insertion that is inserted from mid-March to mid-April, or autumn insertion that is complementarily performed from early September to mid-October, or winter insertion.
In the method of the present invention, the planting density of cuttings is not limited as long as the density is high, but is preferably about 200 / m 2 or more, more preferably about 240 / m 2 or more, and about 300 / m 2 or more. Even more preferred. In addition, in the cuttings in a normal outdoor field, the density is only about 100 strains / m 2 .
工程（２）
工程（２）は、前記培土の底面から潅水して、前記挿し穂の切り口に水分を供給する工程である。
本工程では、温湿度管理、潅水が目的で通常行われるミストの潅水等は必要ないが、挿し木が行われた直後から約１日〜約７日間は頭上潅水によるミストの潅水を行ってよく、その後の期間においても、場合によっては適宜頭上潅水によるミストの潅水を行ってもよい。
Step (2)
Step (2) is a step of irrigating water from the bottom of the cultivated soil and supplying moisture to the cut end.
In this process, mist irrigation, which is usually performed for the purpose of temperature and humidity control and irrigation, is not necessary, but mist irrigation by overhead irrigation may be performed for about 1 day to about 7 days immediately after cutting is performed, In the subsequent period, mist may be appropriately irrigated by overhead irrigation as occasion demands.
本発明における「底面から潅水する」とは、通常の頭上潅水とは異なり培土の下方から潅水することを意味し、底面のみからの潅水、底面及び近傍の側面からの潅水、ならびに底面近傍の側面のみからの潅水等が包含される。
かかる潅水により、各挿し穂が水分を利用し得る各培土の含水量を、約４５％〜約６５％に保つ本発明の方法は好ましく、約５０％〜約６５％に保つ本発明の方法はより好ましく、約５０％〜約６０％に保つ本発明の方法は一層より好ましい。
土壌水分量をｐＦ値によって規定するに、ｐＦ値は限定されず、挿し木苗の育苗において通常採用される値であってよい。ｐＦ値が、約１．０〜約２．５に保たれる本発明の方法は好ましく、約１．５〜約２．３に保たれる本発明の方法はより好ましい。
In the present invention, “irrigation from the bottom surface” means irrigation from below the soil, unlike normal overhead irrigation, irrigation from the bottom surface alone, irrigation from the bottom surface and nearby sides, and side surfaces near the bottom surface. Irrigation from only the water is included.
The method of the present invention in which the water content of each cultivated soil in which each cutting head can utilize moisture is preferably about 45% to about 65% by such irrigation, and the method of the present invention to maintain about 50% to about 65% is preferable. More preferably, the process of the present invention which is maintained at about 50% to about 60% is even more preferred.
When the soil moisture content is defined by the pF value, the pF value is not limited, and may be a value that is usually employed in raising seedlings of cuttings. The method of the present invention in which the pF value is maintained at about 1.0 to about 2.5 is preferred, and the method of the present invention in which the pF value is maintained at about 1.5 to about 2.3 is more preferred.
底面から潅水を行う時期・タイミングは、発根が促進されるものであれば限定されない。定期的に、例えば毎日、１日おき又は２日おきに潅水する方法や、培土の乾燥具合を観察して適宜潅水する方法、あるいは挿し付け後一定期間（例えば１〜３ヶ月間）にわたり培土を湛水状態の容器に常時浸漬させる方法が例示される。
定期的に潅水する方法における潅水する方法及び上記適宜潅水する方法における潅水量は限定されず、各挿し穂の切り口部分に十分に水分が与えられる潅水量であればよい。
The timing and timing of irrigation from the bottom are not limited as long as rooting is promoted. Periodically, for example, irrigating every day or every other day, observing the dryness of the soil, irrigating appropriately, or soiling over a certain period of time (for example, 1 to 3 months) The method of always immersing in the container of a flooded state is illustrated.
The irrigation amount in the method of irrigating regularly and the method of irrigating as appropriate are not limited, and any irrigation amount may be used as long as sufficient water is given to the cut portion of each cutting head.
培土を常時浸漬させる方法においては、培土を入れた浸水が可能な容器ごと、水を張った容器（プール）に浸漬して培土を浸漬する方法が例示される（図１及び２）。
培土を常時浸漬させる方法においては、水に浸漬される培土の高さ（例えば図１におけるａ。コンテナを用いる場合は、コンテナ底面から水面までの高さに相当）は限定されず、当該高さが培土全体の高さ（例えば図１におけるｂ。コンテナを用いる場合は、コンテナ全体の高さに相当）の約３％以上、約４０％以下に保たれる方法は好ましく、約５％以上、約３５％以下に保たれる方法はより好ましく、約５％以上、約３０％以下に保たれる方法は一層より好ましい。
培土全体の高さが約１５ｃｍの場合は、水に浸漬される培土の高さが約０．７ｃｍ〜約６ｃｍである本発明の方法は好ましい。
水深はプールの面積、培土の表面積、時期等を考慮して適宜調節してよい。また、発根をより効率的に促進するために、潅水量を徐々に低減してもよい。
Examples of the method of always immersing the culture medium include a method of immersing the culture medium by immersing it in a container (pool) filled with water together with a container that can be immersed in the culture medium (FIGS. 1 and 2).
In the method of always immersing the culture soil, the height of the culture soil immersed in water (for example, a in FIG. 1. When using a container, it corresponds to the height from the bottom surface of the container to the water surface) is not limited. Is preferably about 3% or more and about 40% or less of the height of the entire cultivated soil (for example, b in FIG. 1; corresponding to the height of the whole container when a container is used). A method that is maintained at about 35% or less is more preferable, and a method that is maintained at about 5% or more and about 30% or less is even more preferable.
When the height of the whole soil is about 15 cm, the method of the present invention in which the height of the soil immersed in water is about 0.7 cm to about 6 cm is preferable.
The water depth may be appropriately adjusted in consideration of the area of the pool, the surface area of the cultivated soil, the time, and the like. Moreover, in order to promote rooting more efficiently, the amount of irrigation may be gradually reduced.
本発明における施設は限定されないところ、通常の温室や実験室ならびに恒温室等を挙げることができる。本発明において、挿し木直後から施設を用いることは好ましい。 The facility in the present invention is not limited, and examples thereof include a normal greenhouse, a laboratory, and a temperature-controlled room. In the present invention, it is preferable to use the facility immediately after cutting.
本発明の方法において、施設内の温度は、挿し付けされた山林樹木の穂が発根・生育する温度に調節されていればよい。本発明において、温度調節された温度が、夜温１０°Ｃ以上および／または平均温度２０°Ｃ以上３５°Ｃ以下である方法は好ましい。夜温１５°Ｃ以上および／または平均温度２５°Ｃ以上３０°Ｃ以下である方法は、より好ましい。
本発明の方法において、施設内の温度以外の育苗条件は通常の条件を用いることができる。
In the method of the present invention, the temperature in the facility may be adjusted to a temperature at which the ears of the inserted forest trees are rooted and grown. In the present invention, a method in which the temperature-controlled temperature is 10 ° C. or higher and / or the average temperature is 20 ° C. or higher and 35 ° C. or lower is preferable. A method in which the night temperature is 15 ° C or higher and / or the average temperature is 25 ° C or higher and 30 ° C or lower is more preferable.
In the method of the present invention, normal conditions can be used for raising seedlings other than the temperature in the facility.
本発明の方法において、施設内の湿度はとくに限定されない。本発明の方法のうち、湿度が調節され、該湿度が相対湿度６０％以上である方法は好ましく、相対湿度７０％以上である方法はより好ましい。
本発明の方法において、他の条件や器具等は、施設を利用した通常の山林樹木挿し木苗を製造する方法におけるものを用いることができる。
本発明の方法において、施設内の光条件はとくに限定されないところ、採穂後の挿し穂の光合成および呼吸活性を抑制するために、施設の遮光が行われる方法は好ましい。遮光が行われる場合、遮光率は、４０％〜５５％が好ましく、４０％〜５０％がより好ましい。
本発明の方法のうち、挿し付け後の穂の生育が、温度条件に加えて湿度条件および光条件が調節された施設内において行われる方法は好ましい。
本発明において、低温期には、プールの水を加温して、例えば夜間における水温を１０℃以上に保つことは好ましく、１５℃以上に保つことはより好ましい。
In the method of the present invention, the humidity in the facility is not particularly limited. Among the methods of the present invention, a method in which the humidity is adjusted and the humidity is 60% or more is preferable, and a method in which the relative humidity is 70% or more is more preferable.
In the method of the present invention, other conditions, instruments, and the like in the method for manufacturing a normal forest tree cutting seedling using a facility can be used.
In the method of the present invention, the light conditions in the facility are not particularly limited, but a method in which the facility is shielded is preferable in order to suppress photosynthesis and respiratory activity of the cuttings after harvesting. When light shielding is performed, the light shielding rate is preferably 40% to 55%, and more preferably 40% to 50%.
Among the methods of the present invention, a method in which the ear growth after insertion is performed in a facility where the humidity condition and the light condition are adjusted in addition to the temperature condition is preferable.
In the present invention, in the low temperature period, it is preferable to heat the water in the pool, for example, to keep the water temperature at night at 10 ° C. or higher, and more preferably at 15 ° C. or higher.
挿し穂を挿し付けした後、該培土の表面を押圧して、培土をより緊密にする本発明の方法は、培土における毛管力を高め、底面から潅水された水分の拡散をより効率的に行うことができるため好ましい。 After inserting the cutting head, the method of the present invention that presses the surface of the soil to make the soil more tight increases the capillary force in the soil and more efficiently diffuses water irrigated from the bottom surface. This is preferable.
本発明の方法のうち、挿し付けをコンテナを用いて行う方法は好ましい。
コンテナとは山林樹木の育苗に用いられる細長形状の容器である。コンテナのサイズは、例えば上径約５ｃｍ、下径約１．５ｃｍ、高さ約１５ｃｍであり、先細りの形状である（図１）。また、コンテナの底部の穴の大きさ、形状も、底部からの潅水による水分をコンテナ内に供給できるものであれば限定されない。
コンテナの形状は限定されず、実質的に四角錐台形状あるいは円錐台形状であってよい。
隣接するコンテナ同士が連結され、数十個の単位で一体化したものはトレイ又は育苗トレイと称されるところ、本発明においてはかかるトレイを用いることができる。
コンテナとして、側面における細い切れ込み部（サイドスリット）を有することは必須ではないが、サイドスリットを有することは好ましい。サイドスリットにより空気根切り（air pruning）がなされ、側根を生じさせることができる。また、リブ付きのコンテナも本発明の方法において好適に用いることができる。
コンテナとしてＢＣＣ社製のもの（商品名：Flexi Flame）や日新農工産業製のもの（３８連樹木用トレイ、商品名：トレイマスター）等が例示されるところ、これらの市販のコンテナは本発明の方法において好適に用いることができる。
Among the methods of the present invention, a method of performing insertion using a container is preferable.
A container is an elongate container used for raising seedlings of mountain forest trees. The size of the container is, for example, an upper diameter of about 5 cm, a lower diameter of about 1.5 cm, and a height of about 15 cm, and has a tapered shape (FIG. 1). Further, the size and shape of the hole at the bottom of the container are not limited as long as the water by irrigation from the bottom can be supplied into the container.
The shape of the container is not limited, and may be substantially a truncated pyramid shape or a truncated cone shape.
A container in which adjacent containers are connected and integrated in units of several tens is called a tray or a seedling raising tray. In the present invention, such a tray can be used.
Although it is not essential to have a thin notch (side slit) on the side as a container, it is preferable to have a side slit. Air pruning can be performed by the side slits to produce side roots. Ribbed containers can also be suitably used in the method of the present invention.
Examples of containers include those manufactured by BCC (trade name: Flexi Flame) and those manufactured by Nissin Agricultural Industry (38-tree tree tray, product name: tray master). This method can be suitably used.
工程（３）
工程（３）は、挿し穂を発根させ、施設内及び屋外において山林樹木挿し木苗を育苗する工程である。当該育苗する方法は限定されず、通常の方法で行ってよい。潅水の方法は頭上潅水又は浸漬による潅水を継続してよく、挿し穂が発根した後に、培土の底面からの潅水を行わない本発明の方法は好ましい。したがって、以下の工程を含む、山林樹木挿し木苗を製造する方法は好ましい：
（１）発根前の挿し穂を高密度で培土に栽植する工程；
（２）前記培土の底面から潅水して該培土に浸水せしめ、前記挿し穂の切り口に水分を供給する工程；
（３’）挿し穂を発根させ、発根した後に、培土の底面からの潅水を停止し、頭上潅水を行って前記発根後の挿し穂を施設内及び屋外において山林樹木挿し木苗を育苗する工程。
Step (3)
Step (3) is a step of rooting cuttings and raising seedlings of mountain forest trees in and outside the facility. The method for raising the seedling is not limited, and may be performed by a normal method. As the irrigation method, overhead irrigation or irrigation by immersion may be continued, and the method of the present invention in which irrigation from the bottom of the soil is not performed after the cuttings have rooted is preferable. Therefore, a method for producing a mountain forest tree cutting seedling comprising the following steps is preferred:
(1) A process of planting cuttings before rooting at a high density on the cultivation soil;
(2) irrigating from the bottom of the cultivated soil to immerse the cultivated soil, and supplying water to the cut end of the cutting ear;
(3 ') After rooting the roots and rooting, stop irrigation from the bottom of the soil, perform overhead irrigation, and raise the cuttings after the rooting in the facility and outdoors Process.
本発明は、上記本発明の方法によって製造される山林樹木挿し木苗にも関する。当該挿し木苗のうち、挿し穂が発根した後に、培土の底面からの潅水を行わない本発明の方法によって製造される挿し木苗は、側根及び細根の発達が促進されるため好ましい。 The present invention also relates to mountain forest tree cuttings produced by the method of the present invention. Among the cuttings, the cuttings produced by the method of the present invention in which the water is not irrigated from the bottom of the soil after the cuttings have rooted are preferable because the development of lateral roots and fine roots is promoted.
実施例によって、本発明をさらに詳細に説明するが、これらの実施例はいかなる意味においても本発明を限定するものではない。
（実施例１）浸漬試験
［目的］
コンテナ底部を水に浸漬することにより地下部の水分状態を均一に保つことによる、発根に対する効果の有無を調べる。
［材料と方法］
・試験地：宮崎県
・山林樹木の種類：スギ（品種：アオシマアラカワ）
・穂の形態：穂の形態の違いによる影響を見るため、比較的堅い穂及び比較的柔らかい穂の両方を供試した。穂長を３０ｃｍに調整し、切り口から５ｃｍを培土に挿し付けた。
・挿し付け年月日：２０１２年９月１８日
・処理（培地水分管理）：底面浸水処理区（本発明：水を溜めたバットにコンテナ下部が浸水するように浸漬）及びミスト潅水処理区（対照）を設けた。
・調査内容：同年１１月２７日（挿し付け後７０日目）に生存率及び発根率を調査した。
The present invention will be described in more detail by way of examples, but these examples do not limit the present invention in any way.
(Example 1) Immersion test [Purpose]
Investigate whether or not there is an effect on rooting by keeping the moisture state of the underground part uniform by immersing the container bottom in water.
[Materials and methods]
・ Test site: Miyazaki ・ Types of forest trees: Japanese cedar (variety: Aoshima Arakawa)
-Ear morphology: In order to see the effects of different ear morphology, both relatively hard and relatively soft ears were tested. The head length was adjusted to 30 cm, and 5 cm from the cut end was inserted into the cultivation soil.
-Insertion date: September 18, 2012-Treatment (medium moisture management): Bottom water immersion treatment zone (the present invention: soaking the bottom of the container in a vat containing water) and mist irrigation treatment zone ( Control) was provided.
-Survey contents: Survival rate and rooting rate were investigated on November 27 of the same year (70th day after insertion).
［結果・考察］
底面浸水処理区（本発明：「底水−柔穂」及び「底水−堅穂」）において、発根が顕著に促進されていた（図３）。目視によれば、これらの底面浸水処理区における発根時期は対照区より約１ヶ月早く、枯死する個体も少なかった。
以上の結果から、本発明の方法は発根を促進する効果を奏することが明らかになった。
[Results and Discussion]
Rooting was remarkably promoted in the bottom-flooded water treatment zone (the present invention: “bottom water-soft ear” and “bottom water-hard ear”) (FIG. 3). Visually, the rooting time in these bottom-flooded treatment sections was about one month earlier than the control section, and few individuals died.
From the above results, it was revealed that the method of the present invention has an effect of promoting rooting.
（実施例２）低温期浸漬試験
［目的］
本発明の方法の低温期における効果を調べる。
［材料と方法］
・試験地：宮崎県
・山林樹木の種類：スギ（品種：不明（山採り穂））
・穂の形態：穂長を３０ｃｍに調整し、切り口から５ｃｍを培土に挿し付けた。
・挿し付け年月日：２０１３年２月４日に挿し付け、底面浸水処理は挿し付けから４月２４日まで行った。
なお、コンテナとしてサイドスリット付きコンテナ（BCC社製：容量１５０ｍｌ）を用いた。
培土配合：赤玉土とピートモスとの混合培土
・処理（培地水分及び夜温管理）：底面浸水処理区（本発明：水を溜めたプールにコンテナ下部が浸水するように浸漬）ならびにミスト管理処理の区（対照）を設けた（表１）。
底面浸水処理区については、底部の浸水を挿し付け後２ヶ月間（４月２４日まで）行い、その後は通常処理の区と同様に頭上潅水のみを行った。
ミスト潅水処理区においては、AM9：00〜PM4：00の間に、１回／時間の割合で潅水を十分に（１分間）行った。
・調査内容：同年５月３１日に生存率及び発根率を調査した。
(Example 2) Low temperature period immersion test [Purpose]
The effect of the method of the present invention in the low temperature period will be examined.
[Materials and methods]
・ Test site: Miyazaki Prefecture ・ Types of forest trees: Japanese cedar (variety: unknown (mountain harvest))
-Shape of the spike: The length of the spike was adjusted to 30 cm, and 5 cm from the cut end was inserted into the soil.
-Insertion date: Insertion was made on February 4, 2013, and the bottom water immersion treatment was performed from the insertion until April 24.
In addition, the container with a side slit (BCC company_made: capacity | capacitance 150 ml) was used as a container.
Cultivation soil mix: Mixed soil with red crust and peat moss ・ Treatment (medium moisture and night temperature control): Bottom water immersion treatment zone (invention: soaked in the bottom of the container in a pool of water) and mist management treatment A ward (control) was established (Table 1).
The bottom-flooded treatment section was carried out for 2 months (until April 24) after inserting the bottom flooding, and thereafter, only overhead irrigation was carried out in the same manner as the normal treatment section.
In the mist irrigation treatment section, irrigation was sufficiently carried out at a rate of once per hour (1 minute) between AM 9:00 and PM 4:00.
・ Investigation contents: Survival rate and rooting rate were investigated on May 31 of the same year.
［結果・考察］
底面浸水処理区（本発明）においては生存率、発根率ともに高かった（表２）。
したがって、本発明の方法は低温期の挿し付けにおいても発根を促進する効果を奏するとともに、挿し穂の歩留まりを向上せしめることが明らかになった。
In the bottom flooded area (invention), both survival rate and rooting rate were high (Table 2).
Therefore, it has been clarified that the method of the present invention has an effect of promoting rooting even in insertion at a low temperature period and improves the yield of cuttings.
本発明によれば、山林樹木挿し木苗の発根率が向上するとともに、発根が促進され、挿し付けから発根までの期間、更に植栽までの期間を短縮することができる。したがって、本発明は、山林樹木苗生産業及び関連産業の発展に資するところ大である。 ADVANTAGE OF THE INVENTION According to this invention, while the rooting rate of a forest forest tree cutting seedling improves, rooting is accelerated | stimulated and the period from planting to rooting and also the period until planting can be shortened. Therefore, the present invention greatly contributes to the development of mountain forest tree seedling industry and related industries.
１・・・挿し穂
２・・・コンテナ
３・・・育苗トレイ
４・・・プール（育苗ベンチ）
５・・・水
1 ... cutting ear 2 ... container 3 ... seedling tray 4 ... pool (nursing bench)
5 ... water
Claims (10)
（１）発根前の挿し穂を、高密度で培土に挿し付けする工程；
（２）前記培土の底面から潅水して、前記挿し穂の切り口に水分を供給する工程；及び
（３）挿し穂を発根させ、施設内及び屋外において山林樹木挿し木苗を育苗する工程。 A method for producing a mountain forest tree cutting seedling including the following steps:
(1) A process of inserting the cuttings before rooting into the soil at high density;
(2) irrigating from the bottom of the cultivated soil and supplying moisture to the cut end of the cutting ear; and (3) rooting the cutting tip and raising a mountain forest tree cutting seedling in the facility and outdoors.
（１）発根前の挿し穂を約２００本／ｍ２以上の密度で培土に栽植する工程；
（２）前記培土の底面から潅水して、前記挿し穂の切り口に水分を供給する工程；及び
（３’）挿し穂を発根させ、発根した後に、培土の底面からの潅水を停止し、頭上潅水を行って前記発根後の挿し穂を施設内及び屋外において山林樹木挿し木苗を育苗する工程。 A method for producing a mountain forest tree cutting seedling including the following steps:
(1) Planting the cuttings before rooting at a density of about 200 / m 2 or more on the cultivation soil;
(2) irrigating from the bottom of the soil and supplying moisture to the cut end of the cutting ear; and (3 ') irrigating from the bottom of the soil after rooting and rooting the cutting ear. The process of carrying out overhead irrigation and raising the above-mentioned rooting cuttings in the facility and outdoors in the forest forests.
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