CN106769628A - A kind of assay method of crop optimum growh point water content - Google Patents
A kind of assay method of crop optimum growh point water content Download PDFInfo
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- CN106769628A CN106769628A CN201710004503.XA CN201710004503A CN106769628A CN 106769628 A CN106769628 A CN 106769628A CN 201710004503 A CN201710004503 A CN 201710004503A CN 106769628 A CN106769628 A CN 106769628A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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Abstract
A kind of assay method of crop optimum growh point water content of the present invention, is related to soil characteristic research field.The present invention is for solve the problems, such as in the prior art cannot Accurate Determining crop optimum growh point water content.A kind of assay method of crop optimum growh point water content of the invention, comprises the following steps：Step one：Take the soil sample sieving after air-drying；Step 2：Its saturation moisture content w is determined using soil samples；Step 3：According to the saturation moisture content w that step 2 is obtaineds, crop optimum growh point water content is obtained according to formula.
Description
Technical field
The present invention relates to soil characteristic research field, more particularly to a kind of measure side of crop optimum growh point water content
Method.
Background technology
In arable farming irrigation management, to start to produce that water suction is difficult, growing starts to be hindered in crop root
Irrigated before stagnant, otherwise its grow will be hindered.And, many studies have shown that, there is a soil water-containing
Amount critical point, when using the critical point as irrigation lower limit, field capacity as the irrigation upper limit, crop growth situation is most
Good, yield reaches highest.The soil moisture content critical point is properly termed as crop optimum growh point water content.All the time, crop
The measure of optimum growh point water content does not have accurate computing formula, general to use the 60%~80% of field capacity to be estimated
Calculate, larger error is caused to arable farming irrigation management.A kind of assay method is needed now, fast and accurately determines that crop is optimal
Growing point water content.
The content of the invention
The invention provides a kind of assay method of crop optimum growh point water content, in the prior art cannot be accurate with solution
Really determine the problem of crop optimum growh point water content.
To achieve the above object, technical scheme is implemented as follows：A kind of survey of crop optimum growh point water content
Determine method, comprise the following steps：
Step one：Take the soil sample sieving after air-drying；
Step 2：Its saturation moisture content w is determined using soil samples；
Step 3：According to the saturation moisture content w that step 2 is obtaineds, crop optimum growh point is obtained according to formula [1] aqueous
Amount.
wi=wwp+0.4218ws [1]
wiIt is crop optimum growh point water content, wwpIt is soil wilting coefficient, wsIt is saturated soil water content.
Further, its saturation moisture content w is determined using soil sample in step 2sProcess be：
Soil sample in step one is loaded into 100cm by by certain unit weight3In cutting ring, the upper and lower port lid of the cutting ring is covered, put
In in the enamel tray being filled with water, down, the water surface is low compared with port lid edge on cutting ring 1~2 millimeter in enamel tray for lower port lid one end, allows moisture
Saturated soil 24 hours；The cutting ring equipped with soil sample is taken out, port lid on cutting ring is taken down, 15~20 grams of soil samples are taken out from cutting ring, put
Enter known weight w1Aluminium box in, be weighed as w2, baking oven is then placed in 105 DEG C of drying to constant weight, it is w to be re-weighed3；Using public affairs
FormulaCalculate and obtain soil acquisition saturation moisture content ws。
Further, in the step one, the soil sample takes from the soil of 0~40cm of upper soll layer depths position.
Further, in the step 3, wwpValue can be carried out according to the soil texture, sandy soil value is 30g kg
-1, loamy soil value is 50g kg-1, clayey soil value is 80g kg-1。
The present invention has the advantages that：The invention provides a kind of measure side of crop optimum growh point water content
Method, the method can accurately calculate crop optimum growh point water content, significantly improve the precision of arable farming irrigation management.Separately
Outward, the present invention determines the saturation moisture content w of soil in a short time using the experimental facilities of cheap and simples, then by mathematics
The method of calculating tries to achieve crop optimum growh point water content wRC, using technical scheme, shorten the mesh of experimental period
's.In addition, serving directive function for the soil irrigation of arid area, water consumption is greatlyd save, be worthy to be popularized.
Specific embodiment
The effect in production practices of the invention is described further with reference to specific embodiment：
A kind of assay method of crop optimum growh point water content, comprises the following steps：
Step one：Take the soil sample sieving after air-drying；
Step 2：Its saturation moisture content w is determined using soil samples(g kg-1)；
Step 3：According to the saturation moisture content w that step 2 is obtaineds, crop optimum growh point is obtained according to formula [1] aqueous
Amount.
wi=wwp+0.4218ws [1]
wiIt is crop optimum growh point water content, wwpIt is soil wilting coefficient, wsIt is saturated soil water content.
Further, its saturation moisture content w is determined using soil sample in step 2sProcess be：
Soil sample in step one is loaded into 100cm by by certain unit weight3In cutting ring, the upper and lower port lid of the cutting ring is covered, put
In in the enamel tray being filled with water, down, the water surface is low compared with port lid edge on cutting ring 1~2 millimeter in enamel tray for lower port lid one end, allows moisture
Saturated soil 24 hours；The cutting ring equipped with soil sample is taken out, port lid on cutting ring is taken down, 15~20 grams of soil samples are taken out from cutting ring, put
Enter known weight w1Aluminium box in, be weighed as w2, baking oven is then placed in 105 DEG C of drying to constant weight, it is w to be re-weighed3；Using public affairs
FormulaCalculate and obtain soil acquisition saturation moisture content ws。
Preferably, in the step one, the soil sample is taken from apart from the position of upper soll layer 30cm~50cm.The step
In three, wwpValue can be carried out according to the soil texture, sandy soil value is 30g kg-1, loamy soil value is 50g kg-1, clayey
Native value is 80g kg-1。
Embodiment 1
Sandy soil is chosen, it is 30g kg to measure its top layer 0~40cm soil wilting coefficients-1, saturation moisture content is
250.7g kg-1, field capacity is 201.8g kg-1.Then proceed as follows successively：
1st, site preparation：Subsoiling is ploughed deeply, depth is 40cm；
2nd, choose seeds：The selected full excellent cotton seed of quality；
3rd, sow：Line-spacing 15cm in ridge, spacing in the rows 25cm, row spacing 56cm, are converted into thickness of sowing and are about：15000 plants/acre.
Drip irrigation zone is laid in ridge, plastic-film-covered cultivation is after planting poured water immediately, 0~40cm soil moisture in layer is reached field capacity.
4th, field management：The crop optimum growh point water content being calculated according to above-mentioned formula [1] is 135.75g kg-1, account for field capacity (201.8g kg-1) ratio be 67%.Therefore, with field capacity (201.8g kg-1) in irrigation
Limit, respectively with soil moisture content respectively reach 60%, 67%, 70% and the 80% of field capacity for irrigate lower limit, i.e., 0~
40cm soil moisture contents are reduced to irrigate lower limit (121.08,135.75,141.26 and 161.44g kg-1) when start fill
Water, when 0~40cm soil moisture contents reach field capacity (250.7g kg-1) when irrigate terminate.Fertilizer amount (every mu) is：N
Plain 20kg, P2O515kg、K2O 8.5kg；30% base is applied, and remaining is applied with water droplet.The whole province is expected to carry out chemical regulation twice, just spends
Every mu of phase sprays mepiquat chloride 1.8g, after pinching 1 week every mu spray mepiquat chloride 5.0g.
Data analysis：Lower limit is irrigated when being respectively 60%, 67%, 70% and 80%, seed cotton yield be respectively 289.4kg,
337.3kg, 302.2kg and 279.8kg；Therefore, when with the 67% of field capacity i.e. crop optimum growh point water content for filling
When irrigating lower limit, yield reaches highest.This explanation, the crop optimum growh point water content computing formula that the present invention is provided is correct
, it is effective in production practices.
Embodiment 2
Loamy soil is chosen, soil wilting coefficient is measured at 0~40cm of top layer for 50g kg-1, saturation moisture content is
385.6g kg-1, field capacity is 321.5g kg-1.Then proceed as follows successively：
1st, site preparation：Subsoiling is ploughed deeply, depth is 40cm；
2nd, choose seeds：The selected full excellent cotton seed of quality；
3rd, sow：Line-spacing 15cm in ridge, spacing in the rows 25cm, row spacing 56cm, are converted into thickness of sowing and are about：15000 plants/acre.
Drip irrigation zone is laid in ridge, plastic-film-covered cultivation is after planting poured water immediately, 0~40cm soil moisture in layer is reached field capacity.
4th, field management：The crop optimum growh point water content being calculated according to equation [1] is 212.65g kg-1, account for
Field capacity (321.5g kg-1) ratio be 66%.Therefore, with field capacity (321.5g kg-1) to irrigate the upper limit,
It is irrigation lower limit, i.e. soil water-containing to respectively reach 60%, 66%, 70% and the 80% of field capacity with soil moisture content respectively
Amount is reduced to irrigate lower limit (192.9,212.65,225.05 and 257.2g kg-1) when start to pour water, 0~40cm soil contains
Water reaches field capacity (250.7g kg-1) when irrigate terminate.Fertilizer amount (every mu) is：N elements 20kg, P2O515kg、K2O
8.5kg；30% base is applied, and remaining is applied with water droplet.The whole province is expected to carry out chemical regulation twice, and every mu of initial bloom stage sprays mepiquat chloride
1.8g, after pinching 1 week every mu spray mepiquat chloride 5.0g.
Data analysis：When irrigation lower limit is respectively 60%, 66%, 70% and 80%, seed cotton yield (every mu) is respectively
362.4kg, 411.3kg, 381.7kg and 323.2kg.Therefore, contain when with the 66% of field capacity i.e. crop optimum growh point
To irrigate during lower limit, yield reaches highest to water.This explanation, the crop optimum growh point water content computing formula that the present invention is provided
It is correct, is effective in production practices.
The above is only presently preferred embodiments of the present invention, is not intended to limit embodiment of the present invention, and this area is general
Logical technical staff's central scope of the invention and spirit, can very easily carry out corresponding flexible or modification, therefore originally
The protection domain of invention should be defined by the protection domain required by claims.
Claims (4)
1. a kind of assay method of crop optimum growh point water content, it is characterised in that comprise the following steps：
Step one：Take the soil sample sieving after air-drying；
Step 2：Its saturation moisture content w is determined using soil samples；
Step 3：According to the saturation moisture content w that step 2 is obtaineds, crop optimum growh point water content is obtained according to formula [1].
wi=wwp+0.4218ws [1]
wiIt is crop optimum growh point water content, wwpIt is soil wilting coefficient, wsIt is saturated soil water content.
2. the assay method of crop optimum growh point water content according to claim 1, it is characterised in that：Profit in step 2
Its saturation moisture content w is determined with soil samplesProcess be：
Soil sample in step one is loaded into 100cm by by certain unit weight3In cutting ring, the upper and lower port lid of the cutting ring is covered, be put in Sheng
In the enamel tray of water, down, the water surface is low compared with port lid edge on cutting ring 1~2 millimeter in enamel tray for lower port lid one end, allows water saturation
Soil 24 hours；The cutting ring equipped with soil sample is taken out, port lid on cutting ring is taken down, 15~20 grams of soil samples are taken out from cutting ring, be put into
Know weight w1Aluminium box in, be weighed as w2, baking oven is then placed in 105 DEG C of drying to constant weight, it is w to be re-weighed3；Using formulaCalculate and obtain soil acquisition saturation moisture content ws。
3. the assay method of crop optimum growh point water content according to claim 1, it is characterised in that：The step one
In, the soil sample takes from the soil of 0~40cm of upper soll layer depths position.
4. the assay method of crop optimum growh point water content according to claim 1, it is characterised in that：The step 3
In, wwpValue can be carried out according to the soil texture, sandy soil value is 30g kg-1, loamy soil value is 50g kg-1, clayey soil
Value is 80g kg-1。
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| CN201710004503.XA CN106769628B (en) | 2017-01-04 | 2017-01-04 | Method for measuring water content of optimal growing point of crop |
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| CN201710004503.XA CN106769628B (en) | 2017-01-04 | 2017-01-04 | Method for measuring water content of optimal growing point of crop |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839102A (en) * | 2022-04-25 | 2022-08-02 | 昆明理工大学 | Method for measuring water retention of garden herbaceous plants |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778550A (en) * | 2012-06-18 | 2012-11-14 | 南京钛白化工有限责任公司 | Soil dry and wet tester |
| CN104330322A (en) * | 2014-09-05 | 2015-02-04 | 江苏大学 | Method for determining irrigation time point of crop based on reconstituted water utilization efficiency |
-
2017
- 2017-01-04 CN CN201710004503.XA patent/CN106769628B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778550A (en) * | 2012-06-18 | 2012-11-14 | 南京钛白化工有限责任公司 | Soil dry and wet tester |
| CN104330322A (en) * | 2014-09-05 | 2015-02-04 | 江苏大学 | Method for determining irrigation time point of crop based on reconstituted water utilization efficiency |
Non-Patent Citations (1)
| Title |
|---|
| 任昌福: "《作物栽培生理》", 30 June 2004, 重庆大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839102A (en) * | 2022-04-25 | 2022-08-02 | 昆明理工大学 | Method for measuring water retention of garden herbaceous plants |
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