JP5040158B2 - Fertilization method in the cultivation of straw - Google Patents

Fertilization method in the cultivation of straw Download PDF

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JP5040158B2
JP5040158B2 JP2006120174A JP2006120174A JP5040158B2 JP 5040158 B2 JP5040158 B2 JP 5040158B2 JP 2006120174 A JP2006120174 A JP 2006120174A JP 2006120174 A JP2006120174 A JP 2006120174A JP 5040158 B2 JP5040158 B2 JP 5040158B2
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JP2007289060A (en
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有之 長久保
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Sumitomo Chemical Co Ltd
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Description

本発明は芋の栽培における施肥方法に関する。 The present invention relates to a fertilization method in cultivation of straw.

野菜生産においては、水稲栽培ほどの機械化が進んでおらず、収益性向上は主として単位面積当たりの収量の向上に向けられている。
単位面積当たりの収量を向上させることを目的として、作物毎に適切な栽培方法(土壌、温度、肥料、栽培器具等)が種々検討されている。例えば、特許文献1にはジベレリン生合成阻害型植物生長調節剤を用いたサツマイモの増収方法が記載されている。
In vegetable production, mechanization is not progressing as much as paddy rice cultivation, and profitability improvement is mainly aimed at improving yield per unit area.
In order to improve the yield per unit area, various cultivation methods (soil, temperature, fertilizer, cultivation tools, etc.) appropriate for each crop have been studied. For example, Patent Document 1 describes a method for increasing the yield of sweet potato using a gibberellin biosynthesis-inhibiting plant growth regulator.

特開平9−70号公報JP-A-9-70

本発明は、単位面積当りの芋の収量を増加させる、芋の栽培における施肥方法を提供することを課題とする。 This invention makes it a subject to provide the fertilization method in cultivation of a cocoon which increases the yield of the cocoon per unit area.

本発明者は芋の栽培における施肥方法について、鋭意検討を重ねた結果、元肥施用される化学肥料において、窒素肥料成分及び加里肥料成分の特定割合を被覆粒状肥料として元肥施用することにより、単位面積当りの芋の収量が増加し、更には収穫される芋の形状が良好となるという副次的な効果を有することを見出し、本発明に至った。 As a result of intensive studies on the fertilization method in cultivation of persimmon, the present inventor applied a specific ratio of nitrogen fertilizer component and kari fertilizer component as a coated granular fertilizer in the unit fertilizer applied chemical fertilizer, so that the unit area The present inventors have found that there is a secondary effect that the yield of persimmon is increased and the shape of the harvested persimmon is improved, leading to the present invention.

即ち、本発明は以下の発明を含む。
[発明1]
芋の栽培における施肥方法であって、元肥施用される化学肥料における総窒素肥料成分の40〜60%の窒素肥料成分及び総加里肥料成分の30〜80%の加里肥料成分を被覆粒状肥料として元肥施用する工程を有することを特徴とする栽培方法。
[発明2]
被覆粒状肥料が尿素及び硫酸加里を含有することを特徴とする発明1に記載された栽培方法。
[発明3]
被覆粒状肥料として、25℃水中において窒素肥料成分の80%溶出に要する期間が60〜140日の範囲である被覆粒状肥料を用いることを特徴とする発明1又は2に記載された栽培方法。
[発明4]
被覆粒状肥料として、25℃水中において加里肥料成分の80%溶出に要する期間が80〜140日の範囲である被覆粒状肥料を用いることを特徴とする発明1又は2に記載された栽培方法。
[発明5]
芋がナガイモであることを特徴とする発明1〜4に記載された栽培方法。
That is, the present invention includes the following inventions.
[Invention 1]
A fertilization method for cultivation of persimmon, wherein 40 to 60% of the total nitrogen fertilizer component and 30 to 80% of the total fertilizer component of the chemical fertilizer applied to the original fertilizer are used as coated granular fertilizer. The cultivation method characterized by having the process to apply.
[Invention 2]
The cultivation method described in Invention 1, wherein the coated granular fertilizer contains urea and potassium sulfate.
[Invention 3]
The cultivation method described in Invention 1 or 2, wherein the coated granular fertilizer is a coated granular fertilizer in which the period required for 80% elution of nitrogen fertilizer components in water at 25 ° C is in the range of 60 to 140 days.
[Invention 4]
The cultivation method described in the invention 1 or 2, wherein the coated granular fertilizer is used in which the period required for 80% elution of the potato fertilizer component in 25 ° C water is in the range of 80 to 140 days.
[Invention 5]
The cultivation method described in Inventions 1 to 4, wherein the cocoon is yam.

本発明の施肥方法により、単位面積当りの芋の収量が増加する。 The fertilization method of the present invention increases the yield of cocoons per unit area.

次に、本発明を詳しく説明する。
本発明における芋とは、デンプン質を蓄えて肥大化した食用となる地下茎または根を有する作物であり、例えばナガイモ、イチョウイモ、ヤマトイモ、サツマイモ、ジャガイモ、サトイモ等が挙げられる。肥大化した地下茎または根の部分が芋である。
ナガイモ、サツマイモ等のように全体の形状が細長い芋において芋の形状が良好であるとは、芋の長さに対して十分な太さを有するもの、或いは曲がりの少ない形状であることを意味する。全体の形状が細長い芋において、形状が良好であることを数値的に表わす方法としては、例えば芋の単位長さに対する重量(以下、形状指数と記す。)を用いることができる。また、ジャガイモ、サトイモ等のように全体の形状が丸い芋において芋の形状が良好であるとは、表面の凹凸が少ないか、1個当たりの重さが重いことを意味する。同様に形状指数により、形状が良好であることを数値的に表わすことが可能である。
Next, the present invention will be described in detail.
The cocoon in the present invention is a crop having a rhizome or root that is edible and stores a starchy material, and examples thereof include Chinese yam, Ginkgo biloba, Yamatoimo, sweet potato, potato, and taro. The enlarged rhizome or root is a cocoon.
When the overall shape of the cocoon is long, such as a yam, sweet potato, etc., the cocoon shape being good means that the cocoon has a sufficient thickness with respect to the length of the cocoon or a shape with little bending. . As a method for numerically representing that the shape is good in the case where the overall shape is long and narrow, for example, the weight with respect to the unit length of the ridge (hereinafter referred to as shape index) can be used. In addition, when the overall shape of a potato, such as potato or taro, the shape of the ridge is good means that there are few surface irregularities or the weight per piece is heavy. Similarly, the shape index can numerically represent that the shape is good.

野菜等の作物においては、大きさ(重量)、形状などによる出荷規格があるが、例えばナガイモでは、大きさ(重量)の区分は一般に階級と言われ、200g刻みで小さい物から、S、M、L、2L等の階級に分類されている。S以下の階級の小さな芋は廃棄されるか、極めて安い価格で取引されるし、長さに対して十分な太さの無い芋は出荷用の箱に納まりきらずに、出荷が困難になる場合がある。出荷規格内の大きさ(重量)や形状の芋を生産することも、収量とともに重要である。 For crops such as vegetables, there are shipping standards depending on size (weight), shape, etc. For example, in Chinese yam, the classification of size (weight) is generally referred to as a class. , L, 2L, etc. Small cocoons of rank S or lower are discarded or traded at an extremely cheap price, and cocoons that are not thick enough for the length do not fit in the shipping box, making shipping difficult There is. It is also important to produce cocoons with a size (weight) and shape within the shipping standards.

本発明において元肥施用される化学肥料とは、窒素、加里、リン、珪素、マグネシウム、カルシウム、マンガン、ホウ素等の植物の成長に必要な種々の元素を含む無機化合物又は尿素(及び尿素誘導体)を含有する肥料である。
窒素肥料成分を含有する化学肥料としては、例えば尿素、硝酸アンモニウム、硝酸苦土アンモニウム、塩化アンモニウム、硫酸アンモニウム、リン酸アンモニウム、硝酸ソーダ、硝酸カルシウム、硝酸加里、石灰窒素、ホルムアルデヒド加工尿素(UF)、アセトアルデヒド加工尿素(CDU)、イソブチルアルデヒド加工尿素(IBDU)、グアニール尿素(GU)等の窒素肥料源化合物を含有する化学肥料が挙げられる。
加里肥料成分を含有する化学肥料としては、例えば塩化加里、硫酸加里、硝酸加里、硫酸加里ソーダ、硫酸加里苦土、重炭酸加里、リン酸加里等の加里肥料源化合物を含有する化学肥料が挙げられる。
本発明において、窒素肥料成分の量はN(窒素原子)換算の重量、加里肥料成分の量はP25(リン酸)換算の重量により求めるものである。
In the present invention, the chemical fertilizer applied in the original fertilizer includes inorganic compounds or urea (and urea derivatives) containing various elements necessary for the growth of plants such as nitrogen, potassium, phosphorus, silicon, magnesium, calcium, manganese, and boron. Contains fertilizer.
Examples of chemical fertilizers containing nitrogen fertilizer components include urea, ammonium nitrate, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate, sodium nitrate, calcium nitrate, potassium nitrate, lime nitrogen, formaldehyde processed urea (UF), and acetaldehyde. Examples include chemical fertilizers containing nitrogen fertilizer source compounds such as processed urea (CDU), isobutyraldehyde processed urea (IBDU), and guaneaure urea (GU).
Examples of chemical fertilizers containing potato fertilizer components include chemical fertilizers containing potato fertilizer source compounds such as potassium chloride, potassium sulfate, potassium nitrate, potassium sulfate soda, potassium sulfate bitter, bicarbonate potassium, potassium phosphate, etc. It is done.
In the present invention, the amount of the nitrogen fertilizer component is determined by the weight in terms of N (nitrogen atom), and the amount of the potassium fertilizer component is determined by the weight in terms of P 2 O 5 (phosphoric acid).

本発明の施肥方法において、元肥施用される化学肥料は被覆粒状肥料を含んでいる。被覆粒状肥料とは、粒状肥料の表面を硫黄や樹脂等の被膜にて表面を被覆することによって、粒状肥料中に含有される肥料成分の溶出を抑制した肥料である。
本発明の施肥方法は、元肥施用される化学肥料における総窒素肥料成分の40〜60%の窒素肥料成分及び総加里肥料成分の30〜90%の加里肥料成分を、より好ましくは総窒素肥料成分の40〜60%の加里肥料成分及び総加里肥料成分の40〜70%の加里肥料成分を、被覆粒状肥料(以下、本被覆粒状肥料と記す。)として元肥施用する工程を有することを特徴とする。本被覆粒状肥料は、窒素肥料成分と加里肥料成分との両方を含有している被覆粒状肥料(以下、本被覆複合肥料と記す。)であっても、窒素肥料成分のみを含有する被覆粒状肥料(以下、本被覆窒素肥料と記す。)と加里肥料成分のみを含有する被覆粒状肥料(以下、本被覆加里肥料と記す。)との混合物であってもよい。本発明の好ましい態様においては、本被覆粒状肥料は本被覆窒素肥料と本被覆加里肥料との混合物である。また、本被覆粒状肥料が、本被覆窒素肥料と本被覆加里肥料との混合物である場合、本被覆窒素肥料と本被覆加里肥料との被膜材料や被覆厚みが異なっていてもよい。また、本被覆窒素肥料が異なる種類の被覆窒素肥料の混合物であってもよく、本被覆加里肥料が異なる種類の被覆加里肥料の混合物であってもよい。
In the fertilization method of the present invention, the chemical fertilizer applied to the original fertilizer includes a coated granular fertilizer. The coated granular fertilizer is a fertilizer in which elution of fertilizer components contained in the granular fertilizer is suppressed by coating the surface of the granular fertilizer with a film such as sulfur or resin.
The fertilization method of the present invention comprises 40-60% of the nitrogen fertilizer component of the total nitrogen fertilizer component and 30-90% of the total fertilizer component of the total fertilizer component in the chemical fertilizer applied to the original fertilizer, more preferably the total nitrogen fertilizer component. 40 to 60% of the potato fertilizer component and 40 to 70% of the potato fertilizer component of the total potato fertilizer component are characterized by having a step of applying the original fertilizer as a coated granular fertilizer (hereinafter referred to as the present coated granular fertilizer). To do. Even if this coated granular fertilizer is a coated granular fertilizer containing both a nitrogen fertilizer component and a potassium fertilizer component (hereinafter referred to as this coated composite fertilizer), the coated granular fertilizer containing only the nitrogen fertilizer component (Hereinafter referred to as the present coated nitrogen fertilizer) and a coated granular fertilizer containing only the potassium fertilizer component (hereinafter referred to as the present coated potassium fertilizer) may be used. In a preferred embodiment of the present invention, the coated granular fertilizer is a mixture of the coated nitrogen fertilizer and the coated potato fertilizer. Moreover, when this coated granular fertilizer is a mixture of this coated nitrogen fertilizer and this coated potassium fertilizer, the coating materials and coating thicknesses of this coated nitrogen fertilizer and this coated potassium fertilizer may be different. Further, the present coated nitrogen fertilizer may be a mixture of different types of coated nitrogen fertilizer, or the present coated potato fertilizer may be a mixture of different types of coated potato fertilizer.

本被覆複合肥料、本被覆窒素肥料及び本被覆加里肥料は通常、窒素肥料成分及び/又は加里肥料成分を含有する粒状肥料の表面を硫黄や樹脂等で被覆することにより製造することができるが、その被覆方法としては特に限定されず、公知の方法により被覆することができるが、例えば特開平9−208355号公報に記載されているように、攪拌装置自身の回転により、粒状肥料を転動させながら、未硬化の熱硬化性樹脂を添加し、粒状肥料の表面にて樹脂を硬化させて被膜を形成する方法や、特開平10−158084号公報に記載されているように、噴流塔内にて粒状肥料を噴流状態とし、熱可塑性樹脂の溶液を噴霧し、熱風にて溶媒を除去することにより被膜を形成する方法等を用いることができる。
本発明で用いられる被膜材としては、例えば硫黄、ワックス、水溶性高分子、熱可塑性樹脂(例えばポリエチレン等のポリオレフィン)、熱硬化性樹脂(例えば、ポリウレタン、ポリウレタン)等が挙げられる。また、特開昭63−147888号、特開平2−275792号、特開平4−202078号、特開平4−202079号、特開平5−201787号、特開平6−56567号、特開平6−87684号、特開平6−191980号、特開平6−191981号、特開平6−87684号等に開示された各種の被覆材を挙げることができる。
The present coated composite fertilizer, the present coated nitrogen fertilizer and the present coated potato fertilizer can usually be produced by coating the surface of a granular fertilizer containing a nitrogen fertilizer component and / or a kari fertilizer component with sulfur or a resin, The coating method is not particularly limited and can be coated by a known method. For example, as described in JP-A-9-208355, the granular fertilizer is rolled by the rotation of the stirring device itself. However, an uncured thermosetting resin is added and the film is formed by curing the resin on the surface of the granular fertilizer, or as described in JP-A-10-158084, For example, a method of forming a film by making the granular fertilizer into a jet state, spraying a solution of a thermoplastic resin, and removing the solvent with hot air can be used.
Examples of the coating material used in the present invention include sulfur, wax, water-soluble polymer, thermoplastic resin (for example, polyolefin such as polyethylene), thermosetting resin (for example, polyurethane, polyurethane) and the like. JP-A 63-147888, JP-A 2-275792, JP-A 4-202078, JP-A 4-202079, JP-A-5-201787, JP-A-6-56567, JP-A-6-87684. And various coating materials disclosed in JP-A-6-191980, JP-A-6-191981, JP-A-6-87684, and the like.

本被覆粒状肥料は、被覆により窒素肥料成分及び/又は加里肥料成分の溶出が抑制されているが、その溶出抑制の程度は、窒素肥料成分の場合、25℃水中において、粒状肥料中の窒素肥料成分の80%溶出に要する期間が好ましくは60〜140日の範囲、より好ましくは80〜120日の範囲である。また、加里肥料成分の場合、25℃水中おいて、粒状肥料中の加里肥料成分の80%溶出に要する期間が好ましくは80〜140日の範囲、より好ましくは80〜120日の間である。
25℃水中における窒素肥料成分又は加里肥料成分の溶出率は、樹脂被覆肥料組成物を25℃恒温水中に、5〜10g/100〜200mlの割合で投じ、経時的に水中に溶け出した窒素肥料成分又は加里肥料成分を定量分析することにより、測定することができる。
In this coated granular fertilizer, the elution of the nitrogen fertilizer component and / or the potassium fertilizer component is suppressed by the coating, but the degree of the elution suppression is in the case of the nitrogen fertilizer component, the nitrogen fertilizer in the granular fertilizer in 25 ° C water. The period required for 80% dissolution of the component is preferably in the range of 60 to 140 days, more preferably in the range of 80 to 120 days. Moreover, in the case of a potato fertilizer component, in 25 degreeC water, the period required for 80% elution of the kari fertilizer component in a granular fertilizer becomes like this. Preferably it is the range of 80-140 days, More preferably, it is between 80-120 days.
The elution rate of nitrogen fertilizer component or potassium fertilizer component in water at 25 ° C. was determined by pouring the resin-coated fertilizer composition at a rate of 5 to 10 g / 100 to 200 ml in 25 ° C. constant temperature water, and the nitrogen fertilizer dissolved into water over time. It can be measured by quantitatively analyzing the component or the potato fertilizer component.

本被覆粒状肥料が本被覆窒素肥料と本被覆加里肥料との混合物であり、本被覆窒素肥料が異なる種類の被覆窒素肥料の混合物である場合、被覆窒素肥料の混合物は窒素肥料成分の80%溶出(25℃水中)に要する期間が15〜25日で、10%溶出(25℃水中)に要する期間が5日以上である被覆窒素肥料を、10〜50%(より好ましくは20〜40%)含有させることが好ましい。 When this coated granular fertilizer is a mixture of this coated nitrogen fertilizer and this coated potassium fertilizer, and this coated nitrogen fertilizer is a mixture of different types of coated nitrogen fertilizers, the coated nitrogen fertilizer mixture will dissolve 80% of the nitrogen fertilizer components 10 to 50% (more preferably 20 to 40%) of the coated nitrogen fertilizer that takes 15 to 25 days (25 ° C water) and 10% elution (25 ° C water) requires 5 days or more. It is preferable to contain.

本被覆窒素肥料に含有される窒素肥料源化合物としては、尿素、硝酸アンモニウム、硝酸苦土アンモニウム、塩化アンモニウム、硫酸アンモニウム、リン酸アンモニウム、硝酸ソーダ、硝酸カルシウム、石灰窒素が挙げられる。
本被覆加里肥料に含有される加里肥料源化合物としては、硫酸加里、塩化加里、硫酸加里ソーダ、硫酸加里苦土、重炭酸加里、リン酸加里が挙げられる。
本発明の好ましい態様においては、本被覆粒状肥料が尿素を含有しており、より好ましい態様においては、本被覆粒状肥料は尿素を含有する本被覆窒素肥料と硫酸加里を含有する本被覆加里肥料との混合物である。
また、本被覆複合肥料、本被覆窒素肥料及び本被覆加里肥料は、その他の肥料成分を含有していてもよく、その他の肥料成分としては、リン酸、珪素、マグネシウム、カルシウム、マンガン、ホウ素、鉄が挙げられる。
Examples of nitrogen fertilizer source compounds contained in the present coated nitrogen fertilizer include urea, ammonium nitrate, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate, sodium nitrate, calcium nitrate, and lime nitrogen.
Examples of the potassium fertilizer source compound contained in the present coated potassium fertilizer include potassium sulfate, potassium chloride, potassium sulfate soda, potassium sulfate sulfate, potassium carbonate, and potassium phosphate.
In a preferred embodiment of the present invention, the coated granular fertilizer contains urea, and in a more preferred embodiment, the coated granular fertilizer includes the coated nitrogen fertilizer containing urea and the coated coated fertilizer containing sulfuric acid potassium. It is a mixture of
In addition, the present coated composite fertilizer, the present coated nitrogen fertilizer and the present coated potato fertilizer may contain other fertilizer components, such as phosphoric acid, silicon, magnesium, calcium, manganese, boron, Iron.

本発明の施肥方法において、元肥施用される、被覆粒状肥料以外の化学肥料としては、例えば速効性の粒状化成肥料、ペースト状肥料、液体肥料等が挙げられる。これらの肥料には、例えば窒素、加里、リン酸、珪素、マグネシウム、カルシウム、マンガン、ホウ素、鉄等の肥料成分が含有される。 In the fertilization method of the present invention, examples of chemical fertilizers other than the coated granular fertilizer that are applied to the original fertilizer include fast-acting granular chemical fertilizers, pasty fertilizers, and liquid fertilizers. These fertilizers contain fertilizer components such as nitrogen, potassium, phosphoric acid, silicon, magnesium, calcium, manganese, boron and iron.

本発明の施肥方法によれば、元肥施用及び1回又は複数回の追肥施用からなる従来の慣行施肥方法に比して、芋の栽培に必要とされる総窒素肥料成分の量を、70〜98%の範囲とすることが可能である。また、芋の栽培に必要とされる総加里肥料成分の量を、慣行施肥方法に比して、20〜80%とすることが可能である。 According to the fertilization method of the present invention, the amount of total nitrogen fertilizer components required for cultivation of straw is 70 to 70% compared to the conventional conventional fertilization method consisting of original fertilization and one or more additional fertilization applications. A range of 98% is possible. Moreover, it is possible to make 20 to 80% of the quantity of the total potassium fertilizer component required for cultivation of a cocoon compared with the conventional fertilization method.

以下、本発明の方法を、青森県地区におけるナガイモの栽培を例として以下に詳しく説明する。
まず、ナガイモの植付け前の4月から5月にかけて圃場の耕起を行う。この際、通常は堆肥を全面施用し、土壌の状態に応じて土壌改良剤(例えば石灰、苦土炭酸カルシウム)を施用する。施用される堆肥の量は、通常10a当り1〜4t程度である。尚、圃場の耕起には、通常溝堀り機(トレンチャー)を使用して、幅約15cm、深さ約1m、即ち収穫されるナガイモに対して十分の深さまで耕起する。
Hereinafter, the method of the present invention will be described in detail below, taking as an example the cultivation of Chinese yam in Aomori Prefecture.
First, the field is plowed from April to May before planting the yams. At this time, generally, compost is applied over the entire surface, and a soil conditioner (eg, lime, calcium carbonate) is applied according to the state of the soil. The amount of compost to be applied is usually about 1 to 4 t per 10a. In addition, the plowing of the field is usually carried out using a trenching machine (trencher) to a width of about 15 cm and a depth of about 1 m, that is, a depth sufficient for a harvested Chinese yam.

次に、5月から6月にかけて種芋の植付けを行う。種芋には、むかご、一年子、2年子、切り芋等が使用することができる。好ましくは、ウイルス病徴のない植物体から採取された種芋を用いる。
通常の畝幅は110〜120cm、株間は18〜24cmで、10a当り4000〜5000本程度の植付けを行う。
元肥施用は種芋の植付けの前でも後でもよいが、通常は種芋の植付け後の約1ヶ月前後に行われる。ナガイモの元肥施用時に施肥される肥料は、通常10a当り窒素肥料成分として15〜30kg、加里肥料成分として10〜30kg、燐酸肥料成分として20〜80kgである。
Next, planting seeds from May to June. As seed potatoes, mukago, first-year children, second-year children, chopped rice cakes, etc. can be used. Preferably, seed culm collected from a plant body free from viral symptoms is used.
The normal ridge width is 110 to 120 cm, and between the strains is 18 to 24 cm, and about 4000 to 5000 plants are planted per 10a.
The original fertilizer application may be performed before or after planting the seed pod, but is usually performed about one month after planting the seed pod. The fertilizer to be applied at the time of applying the original fertilizer of yam is usually 15 to 30 kg as a nitrogen fertilizer component, 10 to 30 kg as a potassium fertilizer component, and 20 to 80 kg as a phosphate fertilizer component per 10a.

ナガイモは6月から7月にかけての茎葉伸長期、7月から8月にかけての茎葉繁茂期を迎えるが、茎葉伸長期において新芋が形成され、茎葉繁茂期に芋は生長肥大する。ナガイモの育成においては、必要により圃場をマルチ被覆し、茎葉が伸長し始めた頃に、蔓を巻きつかせるようにネット等を設置する。また、この時期に必要により、殺虫剤、殺菌剤等を散布する。慣行の施肥体系においては、7月から9月にかけて1〜4回の窒素肥料の追肥が行われる。
茎葉繁茂期の後期、9月以降にかけて、芋は成熟期を迎える。この時期における芋の生長により、収穫時の芋の大きさや形状がほぼ決定される。その後、10月から11月にかけて茎葉黄変期を迎えた後、芋を収穫する。
Chinese yam reaches the foliage growth period from June to July and the foliage growth period from July to August. New foliage is formed in the foliage growth period, and the buds grow and grow during the foliage growth period. In growing yams, if necessary, the field is multi-covered and a net or the like is installed so that the vines can be wrapped around when the foliage begins to grow. If necessary, spray insecticides, fungicides, etc. at this time. In the conventional fertilization system, nitrogen fertilizer is additionally fertilized 1 to 4 times from July to September.
The buds reach maturity during the late stem and leaf growth period and after September. The size and shape of the cocoon at the time of harvest are almost determined by the growth of the cocoon at this time. After that, from October to November, the stems and leaves turn yellow.

以下、実施例により本発明をさらに具体的に説明するが、本発明はこれらに限定されるものではない。
実施例1
青森県東部の2箇所の試験地(試験地A及び試験地B)において、下記の表1の条件にてナガイモを栽培した。
なお、該試験地においては、植付け前の耕起の際に10a当り堆肥3000kg、苦土炭カル120kg、及び苦土重焼リン120kgを全面施用した。
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto.
Example 1
Chinese yams were cultivated under the conditions shown in Table 1 below at two test sites (test site A and test site B) in eastern Aomori Prefecture.
In addition, in this test site, 3000 kg of compost, 120 kg of calcined coal cal, and 120 kg of burnt heavy phosphorus were applied to the entire area at the time of tilling before planting.

Figure 0005040158
*1:全窒素肥料成分に対して、約51%の窒素肥料成分を被覆尿素の形態にて施用した。
*2:全加里肥料成分に対して、約42%の加里肥料成分を被覆硫酸加里の形態にて施用した。
Figure 0005040158
* 1: About 51% nitrogen fertilizer component was applied to the total nitrogen fertilizer component in the form of coated urea.
* 2: Approximately 42% of the potato fertilizer component was applied in the form of coated sulfite potassium to the total potato fertilizer component.

比較例1
実施例1と、植付けから成熟期までに施用される肥料の施肥方法を表2のように変更した以外は同様にナガイモを栽培した。
Comparative Example 1
Chinese yam was cultivated in the same manner as Example 1 except that the fertilizer application method applied from planting to maturity was changed as shown in Table 2.

Figure 0005040158
*3:3回に別けて施用した。
Figure 0005040158
* 3: The application was divided into three times.

実施例1及び比較例1にて収穫されたナガイモの芋の平均重量及び単位長さ当りの重量を表3に示す。 Table 3 shows the average weight and weight per unit length of the potato pods harvested in Example 1 and Comparative Example 1.

Figure 0005040158
*4:単位長さ(cm)に対する重量(g)
Figure 0005040158
* 4: Weight (g) relative to unit length (cm)

実施例1及び比較例1において、単位面積当りの収穫された芋の本数はほぼ等しかった。試験地A及び試験地Bのいずれにおいても、本発明の施肥方法で栽培された場合、単位面積当りの収量が多く、芋の形状も良好であった。 In Example 1 and Comparative Example 1, the number of harvested pods per unit area was almost equal. In both the test site A and the test site B, when cultivated by the fertilization method of the present invention, the yield per unit area was large and the shape of the cocoon was good.

本発明の施肥方法によると、単位面積当りの芋の収量が増加する。
According to the fertilization method of the present invention, the yield of straw per unit area increases.

Claims (2)

ナガイモの栽培における施肥方法であって、元肥施用される化学肥料における総窒素肥料成分の40〜60%の窒素肥料成分及び総加里肥料成分の30〜80%の加里肥料成分を被覆粒状肥料として元肥施用する工程を有し、該被覆粒状肥料として、25℃水中において加里肥料成分の80%溶出に要する期間が80〜140日の範囲である被覆粒状肥料を用いることを特徴とする施肥方法。 A fertilizing method in cultivation of Chinese yam, basal 30-80% of the potassium fertilizer components 40 to 60% of the nitrogen fertilizer components and total potassium fertilizer components of the total nitrogen fertilizer components in fertilizers are basal applied as coated granular fertilizer fertilization method have a step of applying, as the coated granular fertilizer, and wherein Rukoto using coated granular fertilizer in the range of the period required for 80% dissolution 80-140 days of potassium fertilizer components at 25 ° C. water. 被覆粒状肥料が尿素及び硫酸加里を含有することを特徴とする請求項1に記載された施肥方法。 The fertilizing method according to claim 1, wherein the coated granular fertilizer contains urea and potassium sulfate.
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