JP2003079215A - Method for cultivating crop - Google Patents
Method for cultivating cropInfo
- Publication number
- JP2003079215A JP2003079215A JP2002179367A JP2002179367A JP2003079215A JP 2003079215 A JP2003079215 A JP 2003079215A JP 2002179367 A JP2002179367 A JP 2002179367A JP 2002179367 A JP2002179367 A JP 2002179367A JP 2003079215 A JP2003079215 A JP 2003079215A
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- Prior art keywords
- soil
- value
- electric conductivity
- ion concentration
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Fertilizing (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、作物の栽培方法に
関する。TECHNICAL FIELD The present invention relates to a method for cultivating crops.
【０００２】[0002]
【従来の技術】作物の栽培期間中に土壌中の栄養状態を
知ることは、肥料を過不足なく与える上で重要である。
土壌中の栄養状態を正確に知るには、土壌中の水分を採
取し、成分分析を行う必要がある。2. Description of the Related Art It is important to know the nutritional state of soil during the cultivation of crops in order to apply fertilizer in proper quantity.
In order to know the nutritional condition in soil accurately, it is necessary to collect water in soil and analyze its components.
【０００３】しかしながら、栽培者が土壌中の栄養状態
を正確に知ることは、時間、費用、設備等の点から、殆
ど不可能である。However, it is almost impossible for the grower to know the nutritional condition in the soil accurately in terms of time, cost and equipment.
【０００４】土壌中の栄養状態を知るための簡便な方法
として、土壌溶液中に溶存している無機イオンについて
電気伝導度を測定する方法が知られている。この方法で
は、リアルタイムで土壌溶液の電気伝導度を測定できる
ので、即時に施肥量を決定することができる。As a simple method for knowing the nutritional state in soil, a method of measuring the electric conductivity of inorganic ions dissolved in the soil solution is known. With this method, since the electric conductivity of the soil solution can be measured in real time, the fertilizer application amount can be immediately determined.
【０００５】そこで、土耕栽培及び養液栽培において
は、土壌溶液の電気伝導度を測定し、その測定値に基づ
いて施肥量を調整し、施肥することが行われている。Therefore, in soil cultivation and hydroponics, the electric conductivity of the soil solution is measured, and the fertilizer application amount is adjusted based on the measured value, and fertilization is performed.
【０００６】養液土耕栽培は、土耕栽培及び養液栽培と
は異なる栽培法であるが、上記と同様に、土壌溶液の電
気伝導度を測定し、その測定値に基づいて施肥量を調整
し、施肥する方法が適用できると考えられていた。[0006] Hydroponic soil cultivation is a cultivation method different from soil cultivation and hydroponic cultivation, but similarly to the above, the electrical conductivity of the soil solution is measured, and the fertilizer application amount is determined based on the measured value. It was thought that the method of adjusting and fertilizing could be applied.
【０００７】しかしながら、養液土耕栽培を行う場合
に、土壌溶液の電気伝導度を測定し、その測定値に基づ
いて施肥量を調整するだけでは、作物に対して十分効果
的な施肥を行うことができない。However, when performing hydroponic cultivation, it is sufficient to fertilize a crop simply by measuring the electric conductivity of the soil solution and adjusting the fertilization amount based on the measured value. I can't.
【０００８】養液土耕栽培において、土壌溶液の電気伝
導度測定値に基づいて施肥量を調整するだけでは、作物
の生育に異常を来すことが多く、電気伝導度の測定値を
利用して施肥量を調整する方法は実用的でないと考えら
れているのが現状である。In the hydroponic cultivation, if the amount of fertilizer applied is simply adjusted based on the measured electric conductivity of the soil solution, the growth of the crop often becomes abnormal. At present, it is considered that the method of adjusting the amount of fertilizer application is not practical.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、養液土耕栽
培において、土壌溶液の電気伝導度測定値に基づいて施
肥量を調整するだけで、作物に対して効果的な施肥を行
うことができる作物の栽培方法を提供することを課題と
する。DISCLOSURE OF THE INVENTION The present invention provides effective fertilization for crops by simply adjusting the fertilization amount based on the measured electric conductivity of the soil solution in hydroponic cultivation. It is an object to provide a method for cultivating a crop that can grow.
【００１０】[0010]
【課題を解決するための手段】本発明者は、上記課題を
解決した作物の栽培方法を開発すべく鋭意研究を重ねて
きた。本発明者は、作物を栽培する土壌中に存在する塩
素イオン及び硫酸イオンに注目した。そして、土壌溶液
の電気伝導度測定値を利用して施肥量を調整する際に、
土壌中に存在する塩素イオン及び硫酸イオン濃度を考慮
に入れて施肥量を決定することにより、本発明の課題を
解決できることを見い出した。本発明は、斯かる知見に
基づき完成されたものである。
１．本発明は、作物を養液土耕により栽培する方法であ
って、（１）作物を栽培するに先立って、土壌を分析し
て土壌中の塩素イオン濃度及び硫酸イオン濃度を測定す
る手段、（２）次式に従い、塩素イオン及び硫酸イオン
の電気伝導度への寄与値（ds/m）を求める手段、
Ｚ＝（Ｘ×０．２８＋Ｙ×０．２１）×１／１００
［ここでＺは電気伝導度への寄与値、Ｘは測定された塩
素イオン濃度（ppm）、Ｙは測定された硫酸イオン濃度
（ppm）を示す。］
（３）土壌溶液の電気伝導度について、標準電気伝導度
値に、上記（２）で求めた寄与値を加算して、管理目標
値を決定する手段、（４）栽培期間中、土壌溶液中の電
気伝導度を測定する手段、及び（５）上記（４）で求め
た電気伝導度値が、上記（３）で決定した管理目標値の
範囲を維持するように、施肥の際に供給する肥料溶液の
濃度及び液量を調節する手段を備えていることを特徴と
する作物の栽培方法（以下この方法を「方法Ａ」とい
う）である。
２．本発明は、作物を養液土耕により栽培する方法であ
って、（１）作物を栽培するに先立って、土壌を分析し
て土壌中の塩素イオン濃度及び硫酸イオン濃度を測定す
る手段、（２）次式により塩素イオン濃度（ppm）及び
硫酸イオン濃度（ppm）を修正する手段、
Ｘ’＝Ｘ×抽出液容量／（土壌容積×土壌の飽和含水
率）
Ｙ’＝Ｙ×抽出液容積／（土壌容積×土壌の飽和含水
率）
［ここでＸは測定された塩素イオン濃度（ppm）、Ｘ’
は修正された塩素イオン濃度（ppm）を示す。Ｙは測定
された硫酸イオン濃度（ppm）、Ｙ’は修正された硫酸
イオン濃度（ppm）を示す。］
（３）次式に従い、塩素イオン及び硫酸イオンの電気伝
導度への寄与値（ds/m）を求める手段、
Ｚ＝（Ｘ’×０．２８＋Ｙ’×０．２１）×１／１００
［ここでＺは電気伝導度への寄与値を示す。Ｘ’及び
Ｙ’は前記に同じ。］
（４）土壌溶液の電気伝導度について、標準電気伝導度
値に、上記（３）で求めた寄与値を加算して、管理目標
値を決定する手段、（５）栽培期間中、土壌溶液中の電
気伝導度を測定する手段、及び（６）上記（５）で求め
た電気伝導度値が、上記（４）で決定した管理目標値の
範囲を維持するように、施肥の際に供給する肥料溶液の
濃度及び液量を調節する手段を備えていることを特徴と
する作物の栽培方法（以下この方法を「方法Ｂ」とい
う）である。
３．本発明は、作物を養液土耕により栽培する方法であ
って、（１）作物を栽培するに先立って、土壌を分析し
て土壌中の塩素イオン濃度及び硫酸イオン濃度を測定す
る手段、（２）次式に従い、塩素イオン及び硫酸イオン
の電気伝導度への寄与値（ds/m）を求める手段、
Ｚ＝（Ｘ×０．２８＋Ｙ×０．２１）×１／１００
［ここでＺは電気伝導度への寄与値、Ｘは測定された塩
素イオン濃度（ppm）、Ｙは測定された硫酸イオン濃度
（ppm）を示す。］
（３）栽培期間中、土壌溶液中の電気伝導度を測定する
手段、（４）上記（３）で求めた土壌溶液の電気伝導度
値から、上記（２）で求めた寄与値を減じて、補正電気
伝導度値を求める手段、及び（５）上記（４）で得られ
た補正電気伝導度値が、標準電気伝導度値（管理目標
値）を維持するように、施肥の際に供給する肥料溶液の
濃度及び液量を調節する手段を備えていることを特徴と
する作物の栽培方法（以下この方法を「方法Ｃ」とい
う）である。
４．本発明は、作物を養液土耕により栽培する方法であ
って、（１）作物を栽培するに先立って、土壌を分析し
て土壌中の塩素イオン濃度及び硫酸イオン濃度を測定す
る手段、（２）次式により塩素イオン濃度（ppm）及び
硫酸イオン濃度（ppm）を修正する手段、
Ｘ’＝Ｘ×抽出液容量／（土壌容積×土壌の飽和含水
率）
Ｙ’＝Ｙ×抽出液容積／（土壌容積×土壌の飽和含水
率）
［ここでＸは測定された塩素イオン濃度（ppm）、Ｘ’
は修正された塩素イオン濃度（ppm）を示す。Ｙは測定
された硫酸イオン濃度（ppm）、Ｙ’は修正された硫酸
イオン濃度（ppm）を示す。］
（３）次式に従い、塩素イオン及び硫酸イオンの電気伝
導度への寄与値（ds/m）を求める手段、
Ｚ＝（Ｘ’×０．２８＋Ｙ’×０．２１）×１／１００
［ここでＺは電気伝導度への寄与値を示す。Ｘ’及び
Ｙ’は前記に同じ。］
（４）栽培期間中、土壌溶液中の電気伝導度を測定する
手段、（５）上記（４）で求めた土壌溶液の電気伝導度
値から、上記（３）で求めた寄与値を減じて、補正電気
伝導度値を求める手段、及び（６）上記（５）で得られ
た補正電気伝導度値が、標準電気伝導度値（管理目標
値）を維持するように、施肥の際に供給する肥料溶液の
濃度及び液量を調節する手段を備えていることを特徴と
する作物の栽培方法（以下この方法を「方法Ｄ」とい
う）である。[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies to develop a method for cultivating a crop that solves the above problems. The present inventor has focused on chloride ions and sulfate ions existing in the soil for growing crops. And when adjusting the amount of fertilizer application using the electrical conductivity measurement value of the soil solution,
It has been found that the problem of the present invention can be solved by determining the fertilizer application amount in consideration of the chloride ion and sulfate ion concentrations existing in the soil. The present invention has been completed based on such knowledge. 1. The present invention is a method of cultivating a crop by hydroponic cultivation, (1) a means for analyzing soil to measure chloride ion concentration and sulfate ion concentration in the soil prior to cultivating the crop, ( 2) Means for determining the contribution value (ds / m) of chloride ion and sulfate ion to the electrical conductivity according to the following formula: Z = (X × 0.28 + Y × 0.21) × 1/100 [where Z is Contribution value to electric conductivity, X indicates measured chloride ion concentration (ppm), and Y indicates measured sulfate ion concentration (ppm). ] (3) Regarding the electric conductivity of the soil solution, means for determining the management target value by adding the contribution value obtained in the above (2) to the standard electric conductivity value, (4) soil solution during the cultivation period Means for measuring the electric conductivity of the inside, and (5) supply at the time of fertilization so that the electric conductivity value obtained in (4) above maintains the range of the management target value determined in (3) above. A method for cultivating a crop (hereinafter, this method is referred to as "method A"), which comprises means for adjusting the concentration and liquid amount of the fertilizer solution. 2. The present invention is a method of cultivating a crop by hydroponic cultivation, (1) a means for analyzing soil to measure chloride ion concentration and sulfate ion concentration in the soil prior to cultivating the crop, ( 2) Means for correcting chloride ion concentration (ppm) and sulfate ion concentration (ppm) by the following formula: X ′ = X × volume of extract / (soil volume × saturated water content of soil) Y ′ = Y × volume of extract / (Soil volume x soil saturated water content) [where X is the measured chloride ion concentration (ppm), X '
Indicates the corrected chloride ion concentration (ppm). Y represents the measured sulfate ion concentration (ppm), and Y ′ represents the corrected sulfate ion concentration (ppm). ] (3) Means for determining the contribution value (ds / m) of the chloride ion and the sulfate ion to the electrical conductivity according to the following formula: Z = (X '× 0.28 + Y' × 0.21) × 1/100 [ Here, Z represents a contribution value to electric conductivity. X'and Y'are the same as above. ] (4) Regarding the electric conductivity of the soil solution, means for determining the management target value by adding the contribution value obtained in the above (3) to the standard electric conductivity value, (5) soil solution during the cultivation period Means for measuring the electric conductivity of the inside, and (6) Supply at the time of fertilization so that the electric conductivity value obtained in (5) above maintains the range of the management target value determined in (4) above. A method for cultivating a crop (hereinafter, this method is referred to as "method B"), which comprises means for adjusting the concentration and liquid amount of the fertilizer solution. 3. The present invention is a method of cultivating a crop by hydroponic cultivation, (1) a means for analyzing soil to measure chloride ion concentration and sulfate ion concentration in the soil prior to cultivating the crop, ( 2) Means for determining the contribution value (ds / m) of chloride ion and sulfate ion to the electrical conductivity according to the following formula: Z = (X × 0.28 + Y × 0.21) × 1/100 [where Z is Contribution value to electric conductivity, X indicates measured chloride ion concentration (ppm), and Y indicates measured sulfate ion concentration (ppm). ] (3) Means for measuring the electrical conductivity in the soil solution during the cultivation period, (4) Subtracting the contribution value obtained in (2) from the electrical conductivity value of the soil solution obtained in (3) above. And (5) the corrected electrical conductivity value obtained in (4) above maintains the standard electrical conductivity value (management target value) during fertilization. A method for cultivating a crop (hereinafter, this method is referred to as "method C"), which comprises means for adjusting the concentration and liquid amount of the fertilizer solution to be supplied. 4. The present invention is a method of cultivating a crop by hydroponic cultivation, (1) a means for analyzing soil to measure chloride ion concentration and sulfate ion concentration in the soil prior to cultivating the crop, ( 2) Means for correcting chloride ion concentration (ppm) and sulfate ion concentration (ppm) by the following formula: X ′ = X × volume of extract / (soil volume × saturated water content of soil) Y ′ = Y × volume of extract / (Soil volume x soil saturated water content) [where X is the measured chloride ion concentration (ppm), X '
Indicates the corrected chloride ion concentration (ppm). Y represents the measured sulfate ion concentration (ppm), and Y ′ represents the corrected sulfate ion concentration (ppm). ] (3) Means for determining the contribution value (ds / m) of the chloride ion and the sulfate ion to the electrical conductivity according to the following formula: Z = (X '× 0.28 + Y' × 0.21) × 1/100 [ Here, Z represents a contribution value to electric conductivity. X'and Y'are the same as above. ] (4) A means for measuring the electric conductivity in the soil solution during the cultivation period, (5) Subtracting the contribution value obtained in the above (3) from the electric conductivity value of the soil solution obtained in the above (4). And (6) the corrected electrical conductivity value obtained in (5) above maintains the standard electrical conductivity value (management target value) during fertilization. A method for cultivating a crop (hereinafter, this method is referred to as "method D"), which comprises means for adjusting the concentration and liquid amount of the fertilizer solution to be supplied.
【００１１】[0011]
【発明の実施の形態】本明細書において、養液土耕栽培
とは、基肥を施さず、土壌の持っている良さを活用し、
作物の生育に合わせて、作物が必要とする成分を必要な
時に必要な量だけ潅水施肥する栽培方法を意味する。BEST MODE FOR CARRYING OUT THE INVENTION In the present specification, hydroponic cultivation is carried out by applying the goodness of soil without applying base fertilizer,
It means a cultivation method in which the components required by the crop are irrigated and fertilized in the required amount at the necessary time in accordance with the growth of the crop.
【００１２】本発明の養液土耕栽培を実施するに当た
り、作物を栽培する土壌を分析する。土壌中の塩素イオ
ン濃度及び硫酸イオン濃度の測定は、公知の方法に従い
行うことができる。例えば、採取した土壌に所定容積
（例えば、１〜５倍容積）の超純水を加えて塩素イオン
及び硫酸イオンを抽出し、濾過して抽出液を得、この抽
出液中の塩素イオン濃度（ppm）及び硫酸イオン濃度（p
pm）をイオンクロマトグラフィー等を用いて測定する。In carrying out the hydroponic cultivation of the present invention, the soil in which the crop is grown is analyzed. The chloride ion concentration and the sulfate ion concentration in the soil can be measured according to known methods. For example, a predetermined volume (for example, 1 to 5 times the volume) of ultrapure water is added to the collected soil to extract chloride ions and sulfate ions, which is then filtered to obtain an extract solution, and the chloride ion concentration in this extract solution ( ppm) and sulfate ion concentration (p
pm) is measured using ion chromatography or the like.
【００１３】本発明では、イオンクロマトグラフィー等
を用いて測定された塩素イオン濃度（ppm）及び硫酸イ
オン濃度（ppm）をそのまま下記式（３）に当てはめる
ことができるが、超純水を加えて抽出する際の超純水の
使用量が多くなる場合、例えば土壌に対して２〜５倍容
積の超純水を用いるには、下記式（１）及び式（２）に
より塩素イオン濃度（ppm）及び硫酸イオン濃度（ppm）
を修正しておくのが望ましい。In the present invention, the chlorine ion concentration (ppm) and the sulfate ion concentration (ppm) measured by using ion chromatography or the like can be directly applied to the following formula (3), but ultrapure water is added. When the amount of ultrapure water used for extraction is large, for example, in order to use 2-5 times the volume of ultrapure water relative to soil, the chlorine ion concentration (ppm ) And sulfate ion concentration (ppm)
It is desirable to fix.
【００１４】
Ｘ’＝Ｘ×抽出液容量／（土壌容積×土壌の飽和含水率） （１）
［ここでＸは測定された塩素イオン濃度（ppm）、Ｘ’
は修正された塩素イオン濃度（ppm）を示す。］
Ｙ’＝Ｙ×抽出液容積／（土壌容積×土壌の飽和含水率） （２）
［ここでＹは測定された硫酸イオン濃度（ppm）、Ｙ’
は修正された硫酸イオン濃度（ppm）を示す。］
上記式（１）及び（２）において、抽出液容量とは、超
純水を加えて抽出された抽出液の容量である。土壌容積
とは、塩素イオン濃度及び硫酸イオン濃度の測定に使用
される、超純水を加える前の土壌の容積である。土壌の
飽和含水率（％）とは、土壌が超純水で飽和されたとき
の含水率（体積％）であり、土壌容積全体における土壌
の空隙量の割合に相当する。この土壌の飽和含水率は、
土壌の種類によって異なっている。例えば、砂質土壌の
場合は、飽和含水率が５８体積％前後、火山灰土壌の場
合は、飽和含水率が６５体積％前後である。X ′ = X × volume of extract / (soil volume × saturated water content of soil) (1) [where X is the measured chloride ion concentration (ppm), X ′
Indicates the corrected chloride ion concentration (ppm). ] Y '= Y x extract liquid volume / (soil volume x soil saturated water content) (2) [where Y is the measured sulfate ion concentration (ppm), Y'
Indicates the corrected sulfate ion concentration (ppm). In the above formulas (1) and (2), the extraction liquid volume is the volume of the extraction liquid extracted by adding ultrapure water. The soil volume is the volume of soil used before the addition of ultrapure water, which is used for measuring chloride ion concentration and sulfate ion concentration. The saturated water content (%) of the soil is the water content (volume%) when the soil is saturated with ultrapure water, and corresponds to the ratio of the void volume of the soil in the entire soil volume. The saturated water content of this soil is
It depends on the type of soil. For example, in the case of sandy soil, the saturated water content is around 58% by volume, and in the case of volcanic ash soil, the saturated water content is around 65% by volume.
【００１５】本発明では、次いで下記式
Ｚ（ds/m）＝（Ｘ×０．２８＋Ｙ×０．２１）×１／１００ （３）
［ここでＺは電気伝導度への寄与値を示す。Ｘ及びＹは
前記に同じ。］
に、上記で測定した塩素イオン濃度（ppm）及び硫酸イ
オン濃度（ppm）の数値を当てはめて、塩素イオン及び
硫酸イオンの電気伝導度への寄与値（ds/m）を求める。In the present invention, the following formula Z (ds / m) = (X × 0.28 + Y × 0.21) × 1/100 (3) [wherein Z represents a contribution value to electric conductivity. X and Y are the same as above. ] To the values of chlorine ion concentration (ppm) and sulfate ion concentration (ppm) measured above, and obtain the contribution value (ds / m) of chloride ion and sulfate ion to the electric conductivity.
【００１６】上記式（１）及び式（２）により塩素イオ
ン濃度（ppm）及び硫酸イオン濃度（ppm）を求めた場合
には、下記式
Ｚ（ds/m）＝（Ｘ’×０．２８＋Ｙ’×０．２１）×１／１００ （４）
［ここでＺ、Ｘ’及びＹ’は前記に同じ。］
に、上記で測定した塩素イオン濃度（ppm）及び硫酸イ
オン濃度（ppm）の数値を当てはめて、塩素イオン及び
硫酸イオンの電気伝導度への寄与値（ds/m）を求める。When the chlorine ion concentration (ppm) and the sulfate ion concentration (ppm) are obtained by the above equations (1) and (2), the following equation Z (ds / m) = (X '× 0.28 + Y '× 0.21) × 1/100 (4) [where Z, X'and Y'are the same as above. ] To the values of chlorine ion concentration (ppm) and sulfate ion concentration (ppm) measured above, and obtain the contribution value (ds / m) of chloride ion and sulfate ion to the electric conductivity.
【００１７】方法Ａ、方法Ｂ：方法Ａ及び方法Ｂでは、
次に土壌溶液の電気伝導度（ＥＣ）について、標準電気
伝導値（標準ＥＣ値）に上記式（３）又は（４）で求め
た寄与値を加算して、管理目標値を決定する。 Method A, Method B: In Method A and Method B,
Next, regarding the electric conductivity (EC) of the soil solution, the contribution value obtained by the above formula (3) or (4) is added to the standard electric conductivity value (standard EC value) to determine the management target value.
【００１８】標準ＥＣ値は、栽培しようとする作物の種
類、作物の生育段階、作物の栽培時期等において決まっ
ている。例えば、養液栽培において適用されている標準
ＥＣ値を、本発明の標準ＥＣ値に代用することができ
る。標準ＥＣ値の一例を次表に示す。The standard EC value is determined depending on the kind of crop to be cultivated, the growth stage of the crop, the cultivation time of the crop, and the like. For example, the standard EC value applied in hydroponics can be substituted for the standard EC value of the present invention. An example of standard EC values is shown in the following table.
【００１９】尚、実際栽培場面のＥＣ管理上の観点か
ら、標準ＥＣ値はある程度範囲を設けておくのが好まし
く、標準ＥＣ値の±０．５ds/m、好ましくは±０．２ds
/mの範囲を標準ＥＣ値として扱えばよい。From the viewpoint of EC management in actual cultivation situations, it is preferable to set a certain range of standard EC value, and the standard EC value is ± 0.5 ds / m, preferably ± 0.2 ds.
The range of / m should be treated as the standard EC value.
【００２０】[0020]
【表１】 [Table 1]
【００２１】管理目標値（管理目標ＥＣ値）は、標準Ｅ
Ｃ値に上記式で求めた寄与値を加算して決定される。The management target value (management target EC value) is the standard E
It is determined by adding the contribution value obtained by the above equation to the C value.
【００２２】本発明においては、更に、栽培期間中土壌
溶液中の電気伝導度を測定し、測定された電気伝導度値
が上記で決定した管理目標値の範囲を維持できるよう
に、施肥の際に供給する肥料溶液の濃度及び液量を調節
する。In the present invention, further, during the fertilization, the electric conductivity of the soil solution is measured during the cultivation period so that the measured electric conductivity value can be maintained within the control target value range determined above. Adjust the concentration and volume of fertilizer solution to be supplied to.
【００２３】作物の栽培期間中、一定時間（例えば１
日）毎に、作物を栽培している土壌溶液中のＥＣ値を測
定する。During the cultivation period of the crop, a fixed time (for example, 1
Every day), the EC value in the soil solution in which the crop is grown is measured.
【００２４】ＥＣ値の測定は、例えば、点滴チューブに
沿った地点で且つ栽培している作物の株と株との中間地
点で地表面から１５〜２０ｃｍの深さの液体（土壌溶
液）を採取し、ＥＣメーターに浸して行うのがよい。Ｅ
Ｃメーターとしては、市販の簡易ＥＣメーターを用いる
ことができる。このような簡易ＥＣメーターとしては、
例えば、商品名 Twin Cond B-173、（株）堀場製作所
製、商品名ハンディ導電率計、（株）藤原製作所製等が
挙げられる。The EC value is measured, for example, by collecting a liquid (soil solution) having a depth of 15 to 20 cm from the ground surface at a point along the drip tube and at an intermediate point between the stocks of the plant being cultivated. However, it is better to immerse it in an EC meter. E
A commercially available simple EC meter can be used as the C meter. As such a simple EC meter,
For example, trade name Twin Cond B-173, manufactured by HORIBA, Ltd., trade name Handy Conductivity Meter, manufactured by Fujiwara, etc. may be mentioned.
【００２５】土壌溶液の採取には、市販の土壌溶液採取
器を用いることができる。このような土壌溶液採取器と
しては、例えば、商品名ミズトール、大起理化工業
（株）製等が挙げられる。土壌溶液の採取は、潅水施肥
から４〜５時間経過後から次回の潅水施肥前までに行う
のが好ましい。また、土壌溶液の採取は、毎回決まった
時間に行うのがよい。To collect the soil solution, a commercially available soil solution collector can be used. Examples of such soil solution collectors include Mistol, trade name, manufactured by Daiki Rika Kogyo Co., Ltd., and the like. The soil solution is preferably collected 4 to 5 hours after the irrigation and fertilization and before the next irrigation and fertilization. In addition, it is preferable to collect the soil solution at a fixed time each time.
【００２６】上記のようにして土壌溶液中のＥＣ値を測
定し、その値が予め設定した管理目標値の範囲内にある
のか否かを調べることで、土壌中の養分状態が適正か否
かを判断する。By measuring the EC value in the soil solution as described above and checking whether the value is within the range of the preset control target value, it is determined whether the nutrient state in the soil is proper or not. To judge.
【００２７】測定された土壌溶液中のＥＣ値が管理目標
値の範囲外にあるようであれば、次回から供給する肥料
溶液の濃度及び液量を調節して、土壌溶液のＥＣ値が管
理目標値の範囲内になるように修正する。もし、測定値
が低いようであれば次回から施肥される肥料溶液濃度を
濃くし、逆に高いようであれば肥料溶液濃度を薄くし、
土壌溶液のＥＣ値が管理目標値の範囲内になるように修
正しながら管理する。If the measured EC value in the soil solution is outside the control target value range, the EC value of the soil solution is adjusted to the control target value by adjusting the concentration and liquid amount of the fertilizer solution to be supplied next time. Modify so that it is within the range of values. If the measured value is low, increase the concentration of fertilizer solution applied from the next time, and if it is high, decrease the concentration of fertilizer solution.
The EC value of the soil solution is managed while correcting it so that it falls within the control target value range.
【００２８】より具体的な修正手段としては、例えばＥ
Ｃ値を硝酸態窒素で１上昇させる場合、１４０ｐｐｍ
（１４０ｍｇ／ｌ）量を投入窒素量に追加すればよい。
更に詳しく述べれば、栽培面積当たりの１日の潅水量が
１０００リットルであれば、１４０ｇ（＝１０００リッ
トル×１４０ｍｇ／リットル）を１日の投入窒素量に上
乗せして、肥料溶液を調製すればよい。As a more concrete correcting means, for example, E
When C value is increased by 1 with nitrate nitrogen, 140ppm
The amount (140 mg / l) may be added to the amount of input nitrogen.
More specifically, if the daily irrigation amount per cultivated area is 1000 liters, 140 g (= 1000 liters × 140 mg / liter) may be added to the daily input nitrogen amount to prepare a fertilizer solution. .
【００２９】肥料を構成する各成分毎に、その濃度を高
くすることによるＥＣ値の上昇率が定まっている。この
知見をベースにして、複合肥料の場合の濃度とＥＣ値と
の関係を予め求めておくと便利である。例えば、複合肥
料が養液土耕１号（養液土耕栽培用肥料、大塚化学
（株）製）である場合、肥料溶液の供給量を一定にして
おき、その濃度が１０００ｐｐｍ増加するように調整す
ると、ＥＣ値がほぼ１上昇する。従って、土壌溶液中の
ＥＣ値を所望の値に調節するために必要な養液土耕１号
の濃度を容易に決定することができる。The rate of increase of the EC value by increasing the concentration of each component of the fertilizer is determined. Based on this knowledge, it is convenient to previously obtain the relationship between the concentration and the EC value in the case of compound fertilizer. For example, when the compound fertilizer is hydroponic culture No. 1 (fertilizer for hydroponic culture, manufactured by Otsuka Chemical Co., Ltd.), the supply amount of the fertilizer solution is kept constant and its concentration is increased by 1000 ppm. When adjusted, the EC value increases by almost 1. Therefore, the concentration of nutrient solution soil culture No. 1 required for adjusting the EC value in the soil solution to a desired value can be easily determined.
【００３０】土壌溶液中のＥＣ値の修正が必要な場合、
特にＥＣ値が低くなった場合の修正の際に、一度に高濃
度の肥料溶液を供給すると、作物に負荷がかかる虞れが
あるので、徐々に高濃度（例えば２割り増し濃度）にし
ていくのが好ましい。If correction of the EC value in the soil solution is required,
Especially when correcting the EC value when it is low, if a high-concentration fertilizer solution is supplied all at once, the crop may be overloaded, so gradually increase the concentration (for example, by increasing the concentration by 20%). Is preferred.
【００３１】方法Ｃ、方法Ｄ：方法Ｃ及び方法Ｄでは、
次に作物の栽培期間中、一定時間（例えば１日）毎に、
作物を栽培している土壌溶液中のＥＣ値を測定する。Ｅ
Ｃ値の測定は、方法Ａ及び方法Ｂにおける測定方法と同
じである。 Method C, Method D: In Method C and Method D,
Next, during the cultivation period of the crop, at regular intervals (for example, one day),
The EC value in the soil solution in which the crop is grown is measured. E
The measurement of C value is the same as the measurement method in Method A and Method B.
【００３２】方法Ｃ及び方法Ｄでは、次に土壌溶液の電
気伝導度（ＥＣ）について、上記で求めた土壌溶液の電
気伝導度値から、上記式（３）又は（４）で求めた寄与
値を減じて、補正電気伝導度値を決定する。In Method C and Method D, the contribution value obtained by the above equation (3) or (4) from the electric conductivity value of the soil solution obtained above is calculated with respect to the electric conductivity (EC) of the soil solution. To determine the corrected electrical conductivity value.
【００３３】方法Ｃ及び方法Ｄでは、標準ＥＣ値を管理
目標値とすればよく、前述したように±０．５ds/m、好
ましくは±０．２ds/mの幅を持たせてもよい。In Method C and Method D, the standard EC value may be used as the control target value, and as described above, it may have a width of ± 0.5 ds / m, preferably ± 0.2 ds / m.
【００３４】方法Ｃ及び方法Ｄでは、次に上記で得られ
た補正電気伝導度値が、管理目標値の範囲を維持するよ
うに、施肥の際に供給する肥料溶液の濃度及び液量を調
節する。In method C and method D, the concentration and amount of fertilizer solution supplied at the time of fertilization are adjusted so that the corrected electrical conductivity value obtained above maintains the range of the control target value. To do.
【００３５】その詳細は、方法Ａ及び方法Ｂに記載した
ものと同様でよい。The details may be the same as those described in Method A and Method B.
【００３６】本発明方法により栽培される作物：本発明
の方法（方法Ａ〜方法Ｄ）が適用される作物は、特に限
定されるものではないが、例えばキュウリ、ナス、トマ
ト、イチゴ、セルリー等の野菜類、バラ、キク等の花き
類等が挙げられる。 Crop cultivated by the method of the present invention : The crop to which the method of the present invention (method A to method D) is applied is not particularly limited, but includes, for example, cucumber, eggplant, tomato, strawberry, celery and the like. Vegetables, roses, chrysanthemums and other flowers.
【００３７】[0037]
【発明の効果】本発明によれば、養液土耕栽培におい
て、土壌溶液の電気伝導度測定値に基づいて施肥量を調
整するだけで、作物に対して効果的な施肥を行うことが
できる。本発明の方法は、簡便な方法であり、栽培者の
熟練を必要としない。本発明の方法では、栽培される作
物の生育に異常を来す虞れはない。EFFECTS OF THE INVENTION According to the present invention, in hydroponic cultivation, effective application of fertilizer to crops can be carried out only by adjusting the amount of applied fertilizer based on the measured electric conductivity of the soil solution. . The method of the present invention is a simple method and does not require the skill of the grower. According to the method of the present invention, there is no risk of abnormal growth in the cultivated crop.
【００３８】更に、本発明の方法には、塩類過多による
作物根への障害を防止できる、塩類集積による連作障害
を回避できる、過剰な肥料成分による環境汚染を回避で
きる、肥料の使用量を節約できる等の利点がある。Furthermore, the method of the present invention can prevent damage to crop roots due to excessive salt, avoid continuous crop damage due to salt accumulation, avoid environmental pollution due to excessive fertilizer components, and save the amount of fertilizer used. There are advantages such as being able to.
【００３９】[0039]
【実施例】以下に実施例を掲げて、本発明をより一層明
らかにする。EXAMPLES The present invention will be further clarified with reference to the following examples.
【００４０】実施例１
(1)土壌の分析
栽培を予定している土壌２０ｍｌ（砂質土壌、飽和含水
率５８体積％）に超純水１００ｍｌを加え、３０分間横
振とうさせた後、上澄液を濾過し、濾液をイオンクロマ
トグラフィーで分析した。その結果、塩素イオン濃度は
１０ｐｐｍ、硫酸イオンは６０ｐｐｍであった。Example 1 (1) Soil Analysis 100 ml of ultrapure water was added to 20 ml of soil (sandy soil, saturated water content 58% by volume) to be cultivated, and after shaking for 30 minutes, The clear liquid was filtered and the filtrate was analyzed by ion chromatography. As a result, the chlorine ion concentration was 10 ppm and the sulfate ion was 60 ppm.
【００４１】塩素イオン濃度を上記式（１）に当てはめ
て修正すると、
１０ｐｐｍ×１００ｍｌ×（１／（２０ｍｌ×５８
％））＝８６ｐｐｍ
硫酸イオン濃度を上記式（２）に当てはめて修正する
と、
６０ｐｐｍ×１００ｍｌ×（１／（２０ｍｌ×５８
％））＝５１６ｐｐｍ
になった。When the chlorine ion concentration is corrected by applying it to the above equation (1), it becomes 10 ppm × 100 ml × (1 / (20 ml × 58
%)) = 86 ppm When corrected by applying the sulfate ion concentration to the above formula (2), 60 ppm × 100 ml × (1 / (20 ml × 58
%)) = 516 ppm.
【００４２】(2)寄与値の算出
上記(1)で求めた塩素イオン濃度８６ｐｐｍ、硫酸イオ
ン濃度５１６ｐｐｍを、上記式（４）に当てはめて、寄
与値を算出した。(2) Calculation of Contribution Value The chlorine ion concentration of 86 ppm and the sulfate ion concentration of 516 ppm obtained in (1) above were applied to the above equation (4) to calculate the contribution value.
【００４３】（８６×０．２８＋５１６×０．２１）×
１／１００＝１．３２４
寄与値は、１．３２４（ds/m）となった。(86 × 0.28 + 516 × 0.21) ×
1/100 = 1.324 The contribution value was 1.324 (ds / m).
【００４４】(3)管理目標値の決定
ナス栽培における標準ＥＣ値は、育苗期１．２（ds/
m）、定植初期１．３５（ds/m）、中期（交配期）１．
６５（ds/m）、収穫期〜後期２．０（ds/m）である。こ
れらの標準ＥＣ値の±０．２（ds/m）を標準ＥＣ値の範
囲とし、更にこれに上記(2)で求めた寄与値（ds/m）を
加算して、管理目標値（ds/m）を決定した。(3) Determination of management target value The standard EC value in eggplant cultivation is 1.2 (ds /
m), early planting 1.35 (ds / m), middle (mating) 1.
65 (ds / m), harvesting period-late period 2.0 (ds / m). ± 0.2 (ds / m) of these standard EC values is set as the standard EC value range, and the contribution value (ds / m) obtained in (2) above is added to this to obtain the management target value (ds / m) was determined.
【００４５】ナス栽培における管理目標値は、育苗期
２．３２〜２．７２（ds/m）、定植初期２．４７〜２．
８７（ds/m）、中期（交配期）２．７７〜３．１７（ds
/m）、収穫期〜後期３．１２〜３．５２（ds/m）となっ
た。The management target values in eggplant cultivation are 2.32 to 2.72 (ds / m) in the seedling raising period and 2.47 to 2.
87 (ds / m), mid-term (mating period) 2.77-3.17 (ds
/ m), and the harvest period to the latter period of 3.12 to 3.52 (ds / m).
【００４６】(4)ナスの養液土耕栽培
養液土耕栽培方法によりナス（品種：千両）を栽培し
た。肥料として養液土耕５号及び養液土耕２号（いずれ
も大塚化学（株）製）を使用した。栽培期間中、毎日施
肥してから４時間後に土壌溶液採取器（商品名ミズトー
ル、大起理化工業（株）製）にて土壌溶液を採取し、土
壌溶液の電気伝導度（ds/m）を簡易ＥＣメーター（商品
名 Twin Cond B-173、（株）堀場製作所製）を用いて測
定した。(4) Eggplant Hydroponic Cultivation Cultivation of eggplants (cultivar: 1,000 cars) was carried out by the hydroponic culture method. Hydroponic soil culture No. 5 and nutrient solution soil culture No. 2 (both manufactured by Otsuka Chemical Co., Ltd.) were used as fertilizers. During the cultivation period, 4 hours after daily fertilization, the soil solution was sampled with a soil solution sampler (trade name: Mistol, manufactured by Daiki Rika Kogyo Co., Ltd.), and the electrical conductivity (ds / m) of the soil solution was measured. The measurement was performed using a simple EC meter (Twin Cond B-173, manufactured by Horiba, Ltd.).
【００４７】測定された電気伝導度（ds/m）が上記管理
目標値（ds/m）の範囲内にあることを確認し、管理目標
値から外れた場合には施肥する肥料溶液濃度を調整し、
土壌溶液の電気伝導度が管理目標値（ds/m）の範囲内に
あるように修正した。It is confirmed that the measured electric conductivity (ds / m) is within the range of the above control target value (ds / m), and when it is out of the control target value, the concentration of fertilizer solution to be fertilized is adjusted. Then
The electrical conductivity of the soil solution was corrected so that it was within the control target value (ds / m).
【００４８】この方法で収穫された秀品規格以上のナス
の収量は、１０００ｍ2当たり、１０３２１ｋｇであっ
た。The yield of eggplants which were harvested by this method and which exceeded the standard of excellence was 10321 kg per 1000 m 2 .
【００４９】尚、隣接する場所で、土壌溶液の電気伝導
度を調整することなく、慣行栽培した秀品規格以上のナ
スの収量は、１０００ｍ2当たり、９７８９ｋｇであっ
た。Incidentally, the yield of eggplants which were cultivated in the conventional manner without adjusting the electric conductivity of the soil solution in the adjoining place and which exceeded the excellent standard was 9789 kg per 1000 m 2 .
【００５０】実施例２
(1)土壌の分析
栽培を予定している土壌２０ｍｌ（砂質土壌、飽和含水
率５８体積％）に超純水１００ｍｌを加え、３０分間横
振とうさせた後、上澄液を濾過し、濾液をイオンクロマ
トグラフィーで分析した。その結果、塩素イオン濃度は
８ｐｐｍ、硫酸イオンは７４ｐｐｍであった。Example 2 (1) Analysis of soil 100 ml of ultrapure water was added to 20 ml of soil (sandy soil, saturated water content 58% by volume) to be cultivated, and shaken laterally for 30 minutes, then The clear liquid was filtered and the filtrate was analyzed by ion chromatography. As a result, the chlorine ion concentration was 8 ppm and the sulfate ion was 74 ppm.
【００５１】塩素イオン濃度を上記式（１）に当てはめ
て修正すると、
８ｐｐｍ×１００ｍｌ×（１／（２０ｍｌ×５８％））
＝６８．８ｐｐｍ
硫酸イオン濃度を上記式（２）に当てはめて修正する
と、
７４ｐｐｍ×１００ｍｌ×（１／（２０ｍｌ×５８
％））＝６３７．９ｐｐｍ
になった。When the chlorine ion concentration is corrected by applying it to the above equation (1), it is 8 ppm × 100 ml × (1 / (20 ml × 58%))
= 68.8 ppm When the sulfate ion concentration is applied to the above formula (2) to correct it, 74 ppm × 100 ml × (1 / (20 ml × 58
%)) = 637.9 ppm.
【００５２】(2)寄与値の算出
上記(1)で求めた塩素イオン濃度６８．８ｐｐｍ、硫酸
イオン濃度６３７．９ｐｐｍを、上記式（４）に当ては
めて、寄与値を算出した。(2) Calculation of Contribution Value The chlorine ion concentration of 68.8 ppm and the sulfate ion concentration of 637.9 ppm obtained in (1) above were applied to the above equation (4) to calculate the contribution value.
【００５３】（６８．８×０．２８＋６３７．９×０．
２１）×１／１００＝１．５３２
寄与値は、１．５３２（ds/m）となった。(68.8 × 0.28 + 637.9 × 0.
21) × 1/100 = 1.532 The contribution value was 1.532 (ds / m).
【００５４】(3)管理目標値の決定
トマト栽培における標準ＥＣ値は、育苗期１．２（ds/
m）、定植初期１．３５（ds/m）、中期（交配期）１．
５（ds/m）、収穫期〜後期２．４（ds/m）である。これ
らの標準ＥＣ値の±０．２（ds/m）を管理目標値（ds/
m）とした。(3) Determination of management target value The standard EC value in tomato cultivation is 1.2 (ds /
m), early planting 1.35 (ds / m), middle (mating) 1.
5 (ds / m), 2.4-ds (d / m) from the harvest period to the late stage. ± 0.2 (ds / m) of these standard EC values is the management target value (ds /
m).
【００５５】即ち、トマト栽培における管理目標値は、
育苗期１．０〜１．４（ds/m）、定植初期１．１５〜
１．５５（ds/m）、中期（交配期）１．３〜１．７（ds
/m）、収穫期〜後期２．２〜２．６（ds/m）である。That is, the management target value in tomato cultivation is
Nursery period 1.0-1.4 (ds / m), early planting 1.15
1.55 (ds / m), mid-term (mating period) 1.3-1.7 (ds
/ m), and the harvest period to the latter period of 2.2 to 2.6 (ds / m).
【００５６】(4)トマトの養液土耕栽培
養液土耕栽培方法によりトマト（品種：ほまれ１１４）
を栽培した。肥料として養液土耕５号及び養液土耕２号
（いずれも大塚化学（株）製）を使用した。栽培期間
中、毎日施肥してから４時間後に土壌溶液採取器（商品
名ミズトール、大起理化工業（株）製）にて土壌溶液を
採取し、土壌溶液の電気伝導度（ds/m）を簡易ＥＣメー
ター（商品名 Twin Cond B-173、（株）堀場製作所製）
を用いて測定した。(4) Hydroponic soil cultivation of tomato Tomatoes (variety: Homare 114) by hydroponic cultivation method
Was cultivated. Hydroponic soil culture No. 5 and nutrient solution soil culture No. 2 (both manufactured by Otsuka Chemical Co., Ltd.) were used as fertilizers. During the cultivation period, 4 hours after daily fertilization, the soil solution was sampled with a soil solution sampler (trade name: Mistol, manufactured by Daiki Rika Kogyo Co., Ltd.), and the electrical conductivity (ds / m) of the soil solution was measured. Simple EC meter (Twin Cond B-173, manufactured by Horiba, Ltd.)
Was measured using.
【００５７】測定された電気伝導度（ds/m）から、上記
(2)で求めた寄与値（ds/m）を差し引いた値（補正電気
伝導値）が上記管理目標値（ds/m）の範囲内にあること
を確認し、管理目標値から外れた場合には施肥する肥料
溶液濃度を調整し、補正電気伝導値が管理目標値（ds/
m）の範囲内にあるように修正した。From the measured electric conductivity (ds / m),
When the value (corrected electrical conductivity value) obtained by subtracting the contribution value (ds / m) obtained in (2) is within the range of the above management target value (ds / m), and it is out of the management target value The concentration of fertilizer solution to be fertilized is adjusted, and the corrected electrical conductivity value is the control target value (ds /
It was corrected so that it was within the range of m).
【００５８】この方法で収穫された秀品規格以上のトマ
トの収量は、１０００ｍ2当たり、１５５６６ｋｇであ
った。The yield of tomatoes of excellent quality or better harvested by this method was 15566 kg per 1000 m 2 .
【００５９】尚、隣接する場所で、土壌溶液の電気伝導
度を調整することなく、慣行栽培した秀品規格以上のト
マトの収量は、１０００ｍ2当たり、１４００９ｋｇで
あった。The yield of tomatoes of excellent quality or higher, which were conventionally cultivated without adjusting the electric conductivity of the soil solution at an adjacent place, was 14009 kg per 1000 m 2 .
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 徹 宮城県仙台市青葉区堤通雨宮町３−23 大 塚化学株式会社内 (72)発明者 宮浦 紀史 徳島県鳴門市大麻町姫田字下久保12−１ 大塚化学株式会社鳴門研究所栽培研究セン ター内 (72)発明者 犬伏 芳樹 徳島県鳴門市大麻町姫田字下久保12−１ 大塚化学株式会社鳴門研究所栽培研究セン ター内 (72)発明者 山口 国夫 徳島県鳴門市大麻町姫田字下久保12−１ 大塚化学株式会社鳴門研究所栽培研究セン ター内 Ｆターム(参考） 2B052 BA06 BB02 2G060 AA06 AA14 AD01 AE20 AE40 AF08 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Toru Kato 3-23 Amemiyacho, Tsutsudori, Aoba-ku, Sendai City, Miyagi Prefecture Within Tsuka Chemical Co., Ltd. (72) Inventor Norihito Miyaura 12-1, Shimokubo, Himeda, Oma-cho, Naruto City, Tokushima Prefecture Otsuka Chemical Co., Ltd. Naruto Research Center Cultivation Research Center Inside (72) Inventor Yoshiki Inubushi 12-1, Shimokubo, Himeda, Oma-cho, Naruto City, Tokushima Prefecture Otsuka Chemical Co., Ltd. Naruto Research Center Cultivation Research Center Inside (72) Inventor Kunio Yamaguchi 12-1, Shimokubo, Himeda, Oma-cho, Naruto City, Tokushima Prefecture Otsuka Chemical Co., Ltd. Naruto Research Center Cultivation Research Center Inside F-term (reference) 2B052 BA06 BB02 2G060 AA06 AA14 AD01 AE20 AE40 AF08
Claims (2)
て、（１）作物を栽培するに先立って、土壌を分析して
土壌中の塩素イオン濃度及び硫酸イオン濃度を測定する
手段、（２）次式に従い、塩素イオン及び硫酸イオンの
電気伝導度への寄与値（ds/m）を求める手段、 Ｚ＝（Ｘ×０．２８＋Ｙ×０．２１）×１／１００ ［ここでＺは電気伝導度への寄与値、Ｘは測定された塩
素イオン濃度（ppm）、Ｙは測定された硫酸イオン濃度
（ppm）を示す。］ （３）土壌溶液の電気伝導度について、標準電気伝導度
値に、上記（２）で求めた寄与値を加算して、管理目標
値を決定する手段、（４）栽培期間中、土壌溶液中の電
気伝導度を測定する手段、及び（５）上記（４）で求め
た電気伝導度値が、上記（３）で決定した管理目標値の
範囲を維持するように、施肥の際に供給する肥料溶液の
濃度及び液量を調節する手段を備えていることを特徴と
する作物の栽培方法。1. A method for cultivating a crop by hydroponic culture, (1) a means for analyzing soil to measure chloride ion concentration and sulfate ion concentration in the soil prior to cultivating the crop, (2) A means for obtaining the contribution value (ds / m) of the chloride ion and the sulfate ion to the electric conductivity according to the following formula: Z = (X × 0.28 + Y × 0.21) × 1/100 [where Z Represents a value contributing to electric conductivity, X represents a measured chloride ion concentration (ppm), and Y represents a measured sulfate ion concentration (ppm). ] (3) Regarding the electric conductivity of the soil solution, means for determining the management target value by adding the contribution value obtained in the above (2) to the standard electric conductivity value, (4) soil solution during the cultivation period Means for measuring the electric conductivity of the inside, and (5) supply at the time of fertilization so that the electric conductivity value obtained in (4) above maintains the range of the management target value determined in (3) above. A method for cultivating a crop, which comprises means for adjusting the concentration and liquid amount of the fertilizer solution.
て、（１）作物を栽培するに先立って、土壌を分析して
土壌中の塩素イオン濃度及び硫酸イオン濃度を測定する
手段、（２）次式に従い、塩素イオン及び硫酸イオンの
電気伝導度への寄与値（ds/m）を求める手段、 Ｚ＝（Ｘ×０．２８＋Ｙ×０．２１）×１／１００ ［ここでＺは電気伝導度への寄与値、Ｘは測定された塩
素イオン濃度（ppm）、Ｙは測定された硫酸イオン濃度
（ppm）を示す。］ （３）栽培期間中、土壌溶液中の電気伝導度を測定する
手段、（４）上記（３）で求めた土壌溶液の電気伝導度
値から、上記（２）で求めた寄与値を減じて、補正電気
伝導度値を求める手段、及び（５）上記（４）で得られ
た補正電気伝導度値が、標準電気伝導度値を維持するよ
うに、施肥の際に供給する肥料溶液の濃度及び液量を調
節する手段を備えていることを特徴とする作物の栽培方
法。2. A method for cultivating a crop by hydroponic culture, (1) a means for analyzing soil to measure chloride ion concentration and sulfate ion concentration in the soil prior to cultivating the crop, (2) A means for obtaining the contribution value (ds / m) of the chloride ion and the sulfate ion to the electric conductivity according to the following formula: Z = (X × 0.28 + Y × 0.21) × 1/100 [where Z Represents a value contributing to electric conductivity, X represents a measured chloride ion concentration (ppm), and Y represents a measured sulfate ion concentration (ppm). ] (3) Means for measuring the electrical conductivity in the soil solution during the cultivation period, (4) Subtracting the contribution value obtained in (2) from the electrical conductivity value of the soil solution obtained in (3) above. And (5) the fertilizer solution supplied at the time of fertilization so that the corrected electric conductivity value obtained in (4) above maintains the standard electric conductivity value. A method for cultivating a crop, comprising a means for adjusting the concentration and the liquid amount.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007037484A (en) * | 2005-08-04 | 2007-02-15 | Takamori Oide | Method for managing water supply in plant cultivation apparatus, water-supply controlling computer program, and water-supply controlling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007037484A (en) * | 2005-08-04 | 2007-02-15 | Takamori Oide | Method for managing water supply in plant cultivation apparatus, water-supply controlling computer program, and water-supply controlling device |
| JP4636964B2 (en) * | 2005-08-04 | 2011-02-23 | 隆盛 大出 | Water supply management method, water supply management computer program, and water supply management device in plant cultivation apparatus |
| JP2013167567A (en) * | 2012-02-16 | 2013-08-29 | Taiheiyo Material Kk | Method for measuring soil salinity concentration |
| CN103004352A (en) * | 2012-12-31 | 2013-04-03 | 江苏大学 | Greenhouse crop fertigation method |
| CN104472088A (en) * | 2014-11-13 | 2015-04-01 | 沈阳远大科技园有限公司 | Method for determining plant fertilizing amount by detecting EC values of fertilizing solution and soil |
| WO2016158987A1 (en) * | 2015-03-31 | 2016-10-06 | 株式会社ルートレック・ネットワークス | Fertigation system, fertigation control server, salts accumulation determination method, and soil ec sensor |
| JP2016191654A (en) * | 2015-03-31 | 2016-11-10 | 株式会社ルートレック・ネットワークス | Salt accumulation determination method and soil ec sensor |
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