CN106408431B - A kind of Water-nitrogen coupling type assessment method based on crop fractional yield - Google Patents
A kind of Water-nitrogen coupling type assessment method based on crop fractional yield Download PDFInfo
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 230000008878 coupling Effects 0.000 title claims abstract description 42
- 238000010168 coupling process Methods 0.000 title claims abstract description 42
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 180
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 230000008485 antagonism Effects 0.000 claims abstract description 6
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- 238000003973 irrigation Methods 0.000 claims description 25
- 230000002262 irrigation Effects 0.000 claims description 25
- 230000001965 increasing effect Effects 0.000 claims description 24
- 238000011156 evaluation Methods 0.000 claims description 16
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- 239000003337 fertilizer Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000000618 nitrogen fertilizer Substances 0.000 claims description 8
- 238000013210 evaluation model Methods 0.000 claims description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 5
- 230000008635 plant growth Effects 0.000 abstract description 5
- 239000003102 growth factor Substances 0.000 abstract description 3
- 230000012010 growth Effects 0.000 description 14
- 241000209140 Triticum Species 0.000 description 6
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- 239000002131 composite material Substances 0.000 description 3
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- 235000015097 nutrients Nutrition 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000001808 coupling effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 238000009331 sowing Methods 0.000 description 2
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- 229930002875 chlorophyll Natural products 0.000 description 1
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Abstract
The present invention relates to a kind of Water-nitrogen coupling type assessment method based on crop fractional yield, belong to plant growth factor control technique field, computation model is arranged in the assessment method first, computation model includes the water nitrogen combination that four groups relatively high low amounts is constituted, the combination that water nitrogen is a large amount is chosen to be used as wait evaluate combination, other three as referring to combination, crop yield under four seed types is measured respectively and calculates the fractional yield actual value and fractional yield theoretical value of combination to be evaluated, if the fractional yield actual value wait evaluate the lower crop of combination is not significantly different with fractional yield theoretical value, that is P < 0.05, type is " adduction ", i.e. " water nitrogen is independent of each other, there is no interaction ", if fractional yield actual value is significantly higher than fractional yield theoretical value, type is " collaboration ", " surges and promote nitrogen, nitrogen pick-up promotees water ", if opposite produce Amount actual value is substantially less than fractional yield theoretical value, and type is " antagonism ", i.e., " surges and limit nitrogen, nitrogen pick-up is restricted water supply ".
Description
Technical field
The invention belongs to plant growth factor control technique fields, are related to the regulation of water nitrogen in crop, and in particular to a kind of
Water-nitrogen coupling type assessment method based on crop fractional yield.
Background technique
There is the saying of " there are receipts without being received in water, receive is received in less in fertilizer more " in agricultural production, moisture and nutrient are close
Two indispensable big growth factors of associated crop growth, while being that artificial adjustment is the closeest in farmland ecosystem again
Collection, the highest two overall situation factor of attention degree, crop yield and quality are served it is vital, most in nutrient and with nitrogen
It is important.Currently, the wasting of resources caused by China's field water fertilizer shortage of resources is low with water and fertilizer utilization rate and problem of environmental pollution are general
Store-through exists, and there are aggravation trend in some areas, how to improve water and fertilizer utilization rate and Agriculture Ecological Environment Security is kept to have become
The critical issue of agricultural sustainable development.For water nitrogen there are apparent coupling effect, moisture is suitable for that utilization rate of nitrogen fertilizer can be improved, arid
Then limit the absorption of nitrogen；In right amount apply nitrogen can effective water transfer, improve water use efficiency.Crop growth is imitated according to water nitrogen
The difference answered, Water-nitrogen coupling can be divided into three kinds of concrete types, i.e., " sum it up "-water nitrogen is independent of each other, " collaboration "-water nitrogen promotes mutually
And " antagonism "-water nitrogen limits mutually, therefore, in order to give full play to Water-nitrogen coupling synergistic effect, how quantitative assessment crop water
Nitrogen coupling type, and then irrigation quantity and amount of nitrogen are determined according to Water-nitrogen coupling type, to realize the efficient benefit of farmland water nitrogen resource
With, it has also become major issue urgently to be resolved during China's agricultural sustainable development.
In recent years, the relationship in relation to Water-nitrogen coupling and plant growth, domestic and foreign scholars are from tillage and cultivation, Physiology and biochemistry etc.
Angle has made largely deep qualitative research, and still, since quantitative study falls behind relatively, it is some simple, easy-operating fixed to lack
Figureofmerit so that some research achievements are difficult for base producer grasp, hinder Water and nitrogen use efficiency in actual production into
One step improves.Direct statistic law can be used in the quantitative study of water and fertilizer coupling and plant growth, i.e., directly analyzes crop yield and water
The statistical relationship of nitrogen, direct statistic law can determine irrigation quantity and amount of nitrogen to plant growth on the whole by variance analysis
Whether certain characteristic reciprocations of development are significant, these features include yield, biomass, photosynthetic rate and chlorophyll content
Deng in addition it is also possible to which the mathematical regression model equation for establishing yield and two factor of water nitrogen also can be by the first order master of equation
The size of effect coefficient and interaction term coefficient and positive and negative determine that water nitrogen is orthogonal to the order and water nitrogen of yield effect intensity
Interaction or negative reciprocation.But physiological mechanism crop growth influenced due to soil moisture and Nutrient Factor
Difference, the type of Water-nitrogen coupling may be entirely different when water nitrogen fertilizing standards difference, therefore, with a simple statistic equation come
Summarize all types of Water-nitrogen coupling effect be it is unreasonable, this is also exactly scarce with direct statistic law research Water-nitrogen coupling type
Where falling into, in addition, squares regression analysis cannot make coupling type, water under the conditions of specific water nitrogen make apparatus to water to nitrogen, nitrogen
Body apparentization, quantification quantitatively clearly specific water nitrogen condition can not be lauched whether nitrogen is restriction factor.Therefore, it is necessary to water
The assessment method of nitrogen coupling type carries out continuing to further investigate.
Summary of the invention
The present invention compensates for the defect of the prior art, provides a kind of Water-nitrogen coupling type based on crop fractional yield and comments
Determine method, the assessment method is using four groups of difference water nitrogen composite types as experimental model, using one of as band evaluation composite class
Type, excess-three avoid Water-nitrogen coupling Change of types factor caused by different water nitrogen fertilizing standards as referring to composite type
Interference, the evaluation of Water-nitrogen coupling type compares acquisition by data, and reliability is significantly higher than the prior art.
The specific technical solution of the present invention is:
A kind of Water-nitrogen coupling type assessment method based on crop fractional yield, key point are the assessment method packets
Include following steps:
A, Evaluation model is set
Two kinds of moisture condition W are setLAnd WH, there are two types of nitrogen amount applied N for every kind of moisture condition settingLAnd NH, form four kinds of water
Nitrogen combines WLNL、WLNH、WHNLAnd WHNH, set WHNHFor wait evaluate combination, excess-three group is referring to combination, wherein " H " generation
Table relatively high amount, " L " represent relatively low amounts, and the corresponding numerical value of the relatively high amount is the corresponding numerical value of relatively low amounts
1.5-2 again；
B, crop fractional yield is calculated
It carries out crop-planting respectively under four kinds of water nitrogen combination conditions, measures crop under four seed types respectively after crop maturity
Yield and calculate WHNHThe fractional yield actual value and fractional yield theoretical value of crop, W under water nitrogen combination conditionLNH、WHNL、
WHNHThe fractional yield actual value of crop is its respectively yield and W under water nitrogen combination conditionLNLThe ratio of yield, WHNHThe combination of water nitrogen
Under the conditions of crop fractional yield theoretical value be WLNHAnd WHNLThe product of fractional yield actual value；
C, the evaluation of Water-nitrogen coupling type
Work as WHNHThe fractional yield actual value with fractional yield theoretical value of crop do not have in 0.05 level under water nitrogen combination condition
There is significant difference, then, WHNHThe Water-nitrogen coupling type of water nitrogen combination is " adduction ", i.e., " water nitrogen is independent of each other, without mutual
Make "；
Work as WHNHThe fractional yield actual value with fractional yield theoretical value of crop are deposited in 0.05 level under water nitrogen combination condition
In significant difference, if fractional yield actual value is higher than fractional yield theoretical value, WHNHThe water nitrogen coupling of water nitrogen combination
Closing type is " collaboration ", i.e., " surges and promote nitrogen, nitrogen pick-up promotees water "；If fractional yield actual value is lower than fractional yield theoretical value, that
, WHNHThe Water-nitrogen coupling type of water nitrogen combination is " antagonism ", i.e., " surges and limit nitrogen, nitrogen pick-up is restricted water supply ".
In the step B, if WHNLThe yield of crop is significantly higher than W under water nitrogen combination conditionLNLWater nitrogen combination condition
There are significant differences in 0.05 level for the yield of lower crop, i.e. two yield, then, the factor for limiting volume increase is water；Such as
Fruit WLNHThe yield of crop is significantly higher than W under water nitrogen combination conditionLNLThe yield of crop under water nitrogen combination condition, i.e. two yield
There are significant differences in 0.05 level, then, the factor for limiting volume increase is nitrogen.
In the step B, if WHNHAnd WHNLThe yield difference and W of crop under water nitrogen combination conditionHNLWater nitrogen combobar
The ratio of crop yield is significantly higher than W under partLNHAnd WLNLThe yield difference and W of crop under water nitrogen combination conditionLNLWater nitrogen combobar
There are significant differences in 0.05 level for the ratio of crop yield under part, i.e. two ratios, then increasing irrigation quantity can promote
Into the performance of fertilizer effectiveness, restricted effect is played to fertilizer effectiveness conversely, increasing irrigation quantity；If WHNHAnd WLNHWater nitrogen group
The yield difference and W of crop under the conditions of conjunctionLNHThe ratio of crop yield is significantly higher than W under water nitrogen combination conditionHNLAnd WLNLWater nitrogen group
The yield difference and W of crop under the conditions of conjunctionLNLThe ratio of crop yield under water nitrogen combination condition, i.e., two ratios are in 0.05 level
There are significant differences, then the production-increasing function poured water can be promoted by increasing amount of nitrogen, conversely, increasing increasing of the amount of nitrogen to pouring water
Produce restricted effect.
The beneficial effects of the present invention are: the present invention combines to form computation model by four groups of water nitrogen, four groups of water nitrogen combine shape
At relatively high amount and relatively low amounts of various combinations, overcomes different condition and be lauched evaluation caused by the generation variation of nitrogen coupling type
Difficulty makes coupling type under the conditions of specific water nitrogen, water to nitrogen, nitrogen to the effect of water specifically apparentization, quantification, evaluation result
Reliably, there is stronger directive significance for the combined administration of water nitrogen in agricultural production, resource optimization is really realized in agricultural production,
Input-output ratio, which is realized, to be minimized.
Specific embodiment
The present invention relates to a kind of Water-nitrogen coupling type assessment method based on crop fractional yield, described assessment method
The following steps are included:
A, Evaluation model is set
Two kinds of moisture condition W are setLAnd WH, there are two types of nitrogen amount applied N for every kind of moisture condition settingLAnd NH, form four kinds of water
Nitrogen combines WLNL、WLNH、WHNLAnd WHNH, set WHNHFor wait evaluate combination, excess-three group is referring to combination, wherein " H " generation
Table relatively high amount, " L " represent relatively low amounts, and the corresponding numerical value of the relatively high amount is the corresponding numerical value of relatively low amounts
1.5-2 again；
B, crop fractional yield is calculated
It carries out crop-planting respectively under four kinds of water nitrogen combination conditions, measures crop under four seed types respectively after crop maturity
Yield and calculate WHNHThe fractional yield actual value and fractional yield theoretical value of crop, W under water nitrogen combination conditionLNH、WHNL、
WHNHThe fractional yield actual value of crop is its respectively yield and W under water nitrogen combination conditionLNLThe ratio of yield, WHNHThe combination of water nitrogen
Under the conditions of crop fractional yield theoretical value be WLNHAnd WHNLThe product of fractional yield actual value；
C, the evaluation of Water-nitrogen coupling type
Work as WHNHThe fractional yield actual value with fractional yield theoretical value of crop are deposited in 0.05 level under water nitrogen combination condition
In significant difference, then, WHNHThe Water-nitrogen coupling type of water nitrogen combination is " adduction ", i.e., " water nitrogen is independent of each other, without mutual
Make "；(note: hereinafter with " significant ", to indicate two values, there are significant differences in 0.05 level)
If fractional yield actual value is significantly higher than fractional yield theoretical value, Water-nitrogen coupling type is " collaboration ", i.e.,
" surge and promote nitrogen, nitrogen pick-up promotees water "；If fractional yield actual value is substantially less than fractional yield theoretical value, Water-nitrogen coupling class
Type is " antagonism ", i.e., " surges and limit nitrogen, nitrogen pick-up is restricted water supply ".
In addition, the evaluation of following two problem can also be carried out according to the various numerical value in step B:
1) whether water, nitrogen are the evaluation for limiting Factor for increasing output: if WHNLThe yield of crop is significantly high under water nitrogen combination condition
In WLNLThe yield of crop under water nitrogen combination condition, then, the factor for limiting volume increase is water；If WLNHUnder water nitrogen combination condition
The yield of crop is significantly higher than WLNLThe yield of crop under water nitrogen combination condition, then, the factor for limiting volume increase is nitrogen；
2) water evaluates nitrogen, nitrogen to the effect of water: if WHNHAnd WHNLUnder water nitrogen combination condition the yield difference of crop with
WHNLThe ratio of crop yield is significantly higher than W under water nitrogen combination conditionLNHAnd WLNLUnder water nitrogen combination condition the yield difference of crop with
WLNLThe ratio of crop yield under water nitrogen combination condition, then the performance of fertilizer effectiveness can be promoted by increasing irrigation quantity, conversely, then
Increase irrigation quantity and restricted effect is played to fertilizer effectiveness；If WHNHAnd WLNHUnder water nitrogen combination condition the yield difference of crop with
WLNHThe ratio of crop yield is significantly higher than W under water nitrogen combination conditionHNLAnd WLNLUnder water nitrogen combination condition the yield difference of crop with
WLNLThe ratio of crop yield under water nitrogen combination condition, then the production-increasing function poured water can be promoted by increasing amount of nitrogen, conversely, then
Increase amount of nitrogen to the restricted effect of the volume increase poured water.
Embodiment 1, the concrete operations of assessment method the following steps are included:
A, Evaluation model: field planting winter wheat is set, two irrigation quantity processing: W are set75And W150(W75: the jointing stage fills
Water 75mm；W150: jointing stage and florescence pour water 75mm respectively, amount to 150mm), nitrogen is applied in each lower setting two of irrigation quantity processing
It is horizontal: N100And N200(N100: per hectare applies nitrogen double centner, N200: per hectare applies 200 kilograms of nitrogen), nitrogenous fertilizer with the ratio of 1:1 in
It is applied before sowing with the jointing stage, forms 4 water nitrogen combinations: W75N100、W75N200、W150N100And W150N200, wherein W150N200For
Water nitrogen combination to be evaluated, other three is referring to combinations；
B, it calculates crop fractional yield: measuring the yield of seed under each water nitrogen combination condition after winter wheat is mature, count respectively
Calculate W75N200、W150N100And W150N200Fractional yield actual value under water nitrogen combination condition, i.e., respective yield and W75N100Yield
Ratio, yield and fractional yield actual value under each water nitrogen combination condition the results are shown in Table 1.
Table 1 is that each water nitrogen combines winter wheat yields and fractional yield actual value in the present embodiment
It can be learnt by numerical value in table 1: W150N200Fractional yield actual value=1.52, W150N200Fractional yield it is theoretical
Value=W75N200Fractional yield actual value × W150N100Fractional yield actual value=1.18 × 1.13=1.33；
C, the evaluation of Water-nitrogen coupling type: W150N200Fractional yield actual value be 1.52, fractional yield theoretical value is
1.33, it is examined by t, fractional yield actual value is significantly higher than fractional yield theoretical value in 0.05 level, therefore water nitrogen combines
W150N200Water-nitrogen coupling type be " collaboration ", i.e. " surge and promote nitrogen, nitrogen pick-up rush water ", illustrate, in W75N100On the basis of further
Increase irrigation quantity and amount of nitrogen, water nitrogen are mutually promoted, increase yield significantly；
D, whether water nitrogen is the evaluation for increasing production restriction factor: W150N100Yield be significantly higher than W in 0.05 level75N100,
Illustrate irrigation quantity from W75Increase to W150, yield dramatically increases, and moisture is limitation Factor for increasing output；W75N200Yield be significantly higher than
W75N100, illustrate amount of nitrogen from N100Increase to N200, yield dramatically increases, and nitrogenous fertilizer is also limitation Factor for increasing output；
E, water evaluates nitrogen, nitrogen to the effect of water:
Water is to nitrogen: W75N200And W75N100Yield difference and W75N100Ratio (the i.e. W of yield75Under the conditions of amount of nitrogen it is increased
Rate of growth) it is 17.7%, W150N200And W150N100Yield difference and W150N100Ratio (the i.e. W of yield150Under the conditions of amount of nitrogen increase
The rate of growth added) it is 34.3%, it is seen then that and increase is poured water (from W75Increase to W150) keep rate of growth caused by amount of nitrogen increase significant
Increase, i.e., increase, which is poured water, significantly improves the yield increasing effect that nitrogenous fertilizer increases, and achievees the effect that " surge and promote nitrogen "；
Nitrogen is to water: W150N100And W75N100Yield difference and W75N100Ratio (the i.e. N of yield100Under the conditions of irrigation quantity increase
Caused rate of growth) it is 13.0%, W150N200And W75N200Yield difference and W75N200Ratio (the N of yield200Under the conditions of irrigation quantity
Rate of growth caused by increasing) it is 28.9%, it is seen then that and increase applies two amount of nitrogen (from N100Increase to N200) make caused by irrigation quantity increase
Rate of growth dramatically increases, i.e. increase applies nitrogen and significantly improves the increased yield increasing effect of irrigation quantity, achievees the effect that " nitrogen pick-up rush water ".
Embodiment 2, the concrete operations of assessment method the following steps are included:
A, Evaluation model: field planting winter wheat is set, two irrigation quantity processing: W are set150And W225(W150: the jointing stage
Pour water 150mm；W225: jointing stage, florescence and pustulation period pour water 75mm respectively, amount to 225mm), each irrigation quantity processing is divided into
Set two nitrogen amount applieds: N200And N300(N200: per hectare applies 200 kilograms of nitrogen, N300: per hectare applies 300 kilograms of nitrogen), nitrogenous fertilizer is with 1:
1 ratio is applied before sowing with the jointing stage, and 4 water nitrogen combinations: W are formed150N200、W150N300、W225N200And W225N300,
In, W225N300For water nitrogen to be evaluated combination, other three is referring to combinations；
B, it calculates crop fractional yield: measuring the yield of seed under each water nitrogen combination condition after winter wheat is mature, count respectively
Calculate W150N300、W225N200And W225N300Fractional yield actual value under water nitrogen combination condition, i.e., respective yield and W150N200Yield
Ratio, yield and fractional yield actual value under each water nitrogen combination condition the results are shown in Table 2.
Table 2 is that each water nitrogen combines winter wheat yields and fractional yield actual value in the present embodiment
It can be learnt by numerical value in table 2: W225N300Fractional yield actual value=0.92, W225N300Fractional yield it is theoretical
Value=W150N300Fractional yield actual value × W225N200Fractional yield actual value=1.02 × 1.02=1.04；
C, the evaluation of Water-nitrogen coupling type: W225N300Fractional yield actual value be 0.92, fractional yield theoretical value is
1.04, it is examined by t, fractional yield actual value is substantially less than theoretical value in 0.05 level, therefore water nitrogen combines W225N300Water
Nitrogen coupling type is " antagonism ", i.e., " surges and limit nitrogen, nitrogen pick-up is restricted water supply ", illustrate, in W150N200On the basis of further increase and pour water
Nitrogen is applied, the just mutually limitation of water nitrogen is unprofitable to increase production；
D, whether water nitrogen is the evaluation for increasing production restriction factor: W150N200With W225N200Yield it is horizontal not significant 0.05
Difference illustrates irrigation quantity from W150Increase to W225, yield do not dramatically increase, and moisture is not restriction factor；W150N200With
W150N300Yield be not significantly different in 0.05 level, illustrate amount of nitrogen from N200Increase to N300, yield do not increase significantly
Add, nitrogenous fertilizer is also not restriction factor；
E, water evaluates nitrogen, nitrogen to the effect of water:
Water is to nitrogen: W150N300And W150N200Yield difference and W150N200Ratio (the i.e. W of yield150Under the conditions of amount of nitrogen increase
Rate of growth) be 1.5%, W225N300And W225N200Yield difference and W225N200Ratio (the i.e. W of yield225Under the conditions of amount of nitrogen increase
The rate of growth added) it is -9.8%, it is seen then that increase irrigation quantity (from W150Increase to W225) keep rate of growth caused by amount of nitrogen increase aobvious
Writing reduces, i.e. increase irrigation quantity significantly reduces the yield increasing effect that nitrogenous fertilizer increases, " surge and limit nitrogen "；
Nitrogen is to water: W225N200And W150N200Yield difference and W150N200Ratio (the i.e. N of yield200Under the conditions of irrigation quantity increase
Caused rate of growth) it is 2.5%, W225N300And W150N300Yield difference and W150N300Ratio (the N of yield300Under the conditions of irrigation quantity
Rate of growth caused by increasing) it is -8.9%, it is seen then that increase amount of nitrogen (from N200Increase to N300) increase irrigation quantity by caused increase
Yield significantly reduces, i.e. increase applies nitrogen and significantly reduces yield increasing effect caused by irrigation quantity increases, " nitrogen pick-up is restricted water supply ".
The present invention combines to form the computation model of assessment method by constructing four groups of relatively high and low amount various combination, and four
Water nitrogen relatively high amount is used as wait evaluate combination in group water nitrogen combination, other three groups are calculated as reference portfolios, this mode
The problem of evaluating can not be unified caused by forming different coupling types since water nitrogen different under different condition combine by avoiding, so that
Various conditions, which are lauched nitrogen combination, can be derived that accurate coupling type evaluation result, and can also be according to four groups of computation models
Do whether water outlet nitrogen is the evaluation for increasing production restriction factor, the evaluation result to interact between water outlet nitrogen can be also done, for agriculture
In industry production, under various different situations, want to pour water, to want that the size applied fertilizer and measured can obtain accurate, reliable
Guidance, the optimization collocation of resource and yield is realized in agricultural production, while being conducive to the local water resource of protection, is reduced excessive
Water and soil pollution caused by fertilising has very high Social benefit and economic benefit.
Claims (3)
1. a kind of Water-nitrogen coupling type assessment method based on crop fractional yield, it is characterised in that: the assessment method packet
Include following steps:
A, Evaluation model is set
Two kinds of moisture condition W are setLAnd WH, there are two types of nitrogen amount applied N for every kind of moisture condition settingLAnd NH, form four kinds of water nitrogen groups
Close WLNL、WLNH、WHNLAnd WHNH, set WHNHFor wait evaluate combination, excess-three group is reference combination, wherein " H " represents phase
To a large amount, " L " represents relatively low amounts, and the corresponding numerical value of the relatively high amount is the 1.5-2 of the corresponding numerical value of relatively low amounts
Times；
B, crop fractional yield is calculated
It carries out crop-planting respectively under four kinds of water nitrogen combination conditions, measures the production of crop under four seed types after crop maturity respectively
It measures and calculates WHNHThe fractional yield actual value and fractional yield theoretical value of crop, W under water nitrogen combination conditionLNH、WHNL、WHNHWater
The fractional yield actual value of crop is its respectively yield and W under nitrogen combination conditionLNLThe ratio of yield, WHNHWater nitrogen combination condition
The fractional yield theoretical value of lower crop is WLNHAnd WHNLThe product of fractional yield actual value；
C, the evaluation of Water-nitrogen coupling type
Work as WHNHThe fractional yield actual value Yu fractional yield theoretical value of crop are in 0.05 level without aobvious under water nitrogen combination condition
Sex differernce is write, then, WHNHThe Water-nitrogen coupling type of water nitrogen combination is " adduction ", i.e., " water nitrogen is independent of each other, without interaction "；
Work as WHNHThe fractional yield actual value Yu fractional yield theoretical value of crop exist aobvious in 0.05 level under water nitrogen combination condition
When writing sex differernce, if fractional yield actual value is higher than fractional yield theoretical value, WHNHThe Water-nitrogen coupling class of water nitrogen combination
Type is " collaboration ", i.e., " surges and promote nitrogen, nitrogen pick-up promotees water "；If fractional yield actual value is lower than fractional yield theoretical value,
WHNHThe Water-nitrogen coupling type of water nitrogen combination is " antagonism ", i.e., " surges and limit nitrogen, nitrogen pick-up is restricted water supply ".
2. a kind of Water-nitrogen coupling type assessment method based on crop fractional yield according to claim 1, feature exist
In: in the step B, if WHNLThe yield of crop is significantly higher than W under water nitrogen combination conditionLNLMake under water nitrogen combination condition
There are significant differences in 0.05 level for the yield of object, i.e. two yield, then, the factor for limiting volume increase is water；If WLNH
The yield of crop is significantly higher than W under water nitrogen combination conditionLNLThe yield of crop under water nitrogen combination condition, i.e., two yield are 0.05
There are significant differences in level, then, the factor for limiting volume increase is nitrogen.
3. a kind of Water-nitrogen coupling type assessment method based on crop fractional yield according to claim 1, feature exist
In: in the step B, if WHNHAnd WHNLThe yield difference and W of crop under water nitrogen combination conditionHNLMake under water nitrogen combination condition
The ratio of produce amount is significantly higher than WLNHAnd WLNLThe yield difference and W of crop under water nitrogen combination conditionLNLMake under water nitrogen combination condition
There are significant differences in 0.05 level for the ratio of produce amount, i.e. two ratios, then nitrogenous fertilizer can be promoted by increasing irrigation quantity
The performance of fertilizer efficiency plays restricted effect to fertilizer effectiveness conversely, increasing irrigation quantity；If WHNHAnd WLNHWater nitrogen combination condition
The yield difference and W of lower cropLNHThe ratio of crop yield is significantly higher than W under water nitrogen combination conditionHNLAnd WLNLWater nitrogen combination condition
The yield difference and W of lower cropLNLThe ratio of crop yield under water nitrogen combination condition, i.e. two ratios exist aobvious in 0.05 level
Sex differernce is write, then the production-increasing function poured water can be promoted by increasing amount of nitrogen, conversely, it is limited to the volume increase poured water to increase amount of nitrogen
Production is used.
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