CN115176574B - Determination method for nitrogen application amount and nitrogen reduction effect of slow-release nitrogen fertilizer for rice in rice-shrimp co-cropping mode - Google Patents
Determination method for nitrogen application amount and nitrogen reduction effect of slow-release nitrogen fertilizer for rice in rice-shrimp co-cropping mode Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 165
- 239000000618 nitrogen fertilizer Substances 0.000 title claims abstract description 145
- 235000007164 Oryza sativa Nutrition 0.000 title claims abstract description 101
- 235000009566 rice Nutrition 0.000 title claims abstract description 101
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 83
- 230000000694 effects Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 240000007594 Oryza sativa Species 0.000 title 1
- 241000209094 Oryza Species 0.000 claims abstract description 100
- 239000003337 fertilizer Substances 0.000 claims abstract description 14
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000011574 phosphorus Substances 0.000 claims abstract description 8
- 239000011591 potassium Substances 0.000 claims abstract description 8
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 8
- 239000004202 carbamide Substances 0.000 claims description 16
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 claims description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 3
- 235000019691 monocalcium phosphate Nutrition 0.000 claims description 3
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 3
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 3
- 235000011151 potassium sulphates Nutrition 0.000 claims description 3
- 241000238557 Decapoda Species 0.000 abstract description 20
- 201000004569 Blindness Diseases 0.000 abstract 1
- 230000012010 growth Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 241000238030 Procambarus clarkii Species 0.000 description 6
- 230000009418 agronomic effect Effects 0.000 description 6
- 239000002689 soil Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000010902 straw Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229930002875 chlorophyll Natural products 0.000 description 2
- 235000019804 chlorophyll Nutrition 0.000 description 2
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 2
- 238000009313 farming Methods 0.000 description 2
- 230000004720 fertilization Effects 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000019750 Crude protein Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002786 root growth Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/007—Determining fertilization requirements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
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- Algebra (AREA)
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Abstract
The invention discloses a method for determining the nitrogen application amount of a slow-release nitrogen fertilizer of rice and a nitrogen reduction effect of a more conventional nitrogen fertilizer in a rice and shrimp co-cropping mode, which comprises the steps of setting different nitrogen application amounts of the conventional nitrogen fertilizer under the condition that the phosphorus fertilizer and the potassium fertilizer are applied according to conventional production to obtain the nitrogen application amount of the conventional nitrogen fertilizer required by the maximum yield of the rice, setting different nitrogen application amounts of the slow-release nitrogen fertilizer to obtain the nitrogen application amount of the slow-release nitrogen fertilizer required by the maximum yield of the rice, and determining the nitrogen application amount of the slow-release nitrogen fertilizer required by the maximum yield level of the rice under the condition of conventional nitrogen fertilizer application, so as to determine the nitrogen reduction effect of the slow-release nitrogen fertilizer of the rice and the nitrogen fertilizer in the rice and shrimp co-cropping mode. The method can improve the utilization rate of the rice nitrogen fertilizer in the rice-shrimp co-cropping mode and reduce the nitrogen fertilizer consumption, thereby optimizing the operation of the rice nitrogen fertilizer in the rice-shrimp co-cropping mode and solving the blindness of nitrogen fertilizer application.
Description
Technical Field
The invention belongs to the technical field of rice nitrogen fertilizer application, and particularly relates to a method for determining the nitrogen application amount and the nitrogen reduction effect of a rice slow-release nitrogen fertilizer in a rice-shrimp co-cropping mode.
Background
Under the situation of actively advocating the combination of planting and raising, the combination of aquatic crop planting and water product raising has become the mainstream direction, and the mode of 'rice and shrimp co-farming' of rice planting and procambarus clarkia raising has been developed. The rice and shrimp co-cropping mode is to breed procambarus clarkii by digging surrounding ditches in the rice field, the ditches are communicated during the growth of the rice, the rice and shrimp are symbiotic, the purposes of one water and one field and two harvest are realized, and the utilization rate of farmland resources and the output benefit are effectively improved.
The rice yield in the rice-shrimp co-cropping mode also depends on the nitrogen fertilizer input, as in the conventional rice planting mode. However, the rice nitrogen fertilizer operation management in the rice and shrimp co-cropping mode production still refers to a conventional rice planting mode, and the proper rice nitrogen fertilizer type and nitrogen application amount of the mode are still not clear, so that the problem of low rice nitrogen fertilizer utilization rate is caused. In order to provide favorable conditions for the growth of procambarus clarkii during the growth period of rice, the rice and shrimp co-cropping mode is deeper in flooding period and longer in flooding period than the conventional rice planting field, and the rice nitrogenous fertilizer is usually applied at one time. On one hand, the soil is aggravated to be submerged, the absorption of nitrogen fertilizer by root growth is not facilitated, and on the other hand, the risk of leaching loss of the nitrogen fertilizer is increased.
The nitrogen fertilizer is applied in small quantity and more, and the fertilization depth is increased, so that the utilization rate of the nitrogen fertilizer of crops can be increased, but the nitrogen fertilizer is limited by high production cost of manpower, machinery and the like. In recent years, slow-release nitrogen fertilizer which utilizes chemical and biological elements to slowly release nitrogen so as to meet the growth requirements of crops has been rapidly developed and applied. The slow-release nitrogen fertilizer application in the conventional rice planting mode can simplify fertilization, reduce nitrogen fertilizer loss, improve nitrogen fertilizer utilization rate, huang Qiaoyi and the like (2018), ding and the like (2020) and Zhang Jinping and the like (2021) are researched, and the slow-release nitrogen fertilizer application can still ensure that the yield of rice is not reduced by directly reducing the nitrogen application amount by 12% -23%, but the rice nitrogen reduction effect of the slow-release nitrogen fertilizer is not accurately determined through the linear relation between the rice yield and the nitrogen application amount, so that the accuracy of results is required to be improved.
The rice and shrimp co-cropping mode water flooding environment is aggravated, the slow-release nitrogen fertilizer can be used for replacing the conventional nitrogen fertilizer to reduce the loss of the nitrogen fertilizer, but the nitrogen reduction effect of the rice is inevitably different from that of the conventional rice planting mode, and the rice needs to be accurately determined through research. For the above reasons, it is highly desirable to study the linear relationship between the rice yield and the nitrogen application amount of the conventional nitrogen fertilizer and the slow-release nitrogen fertilizer in the rice-shrimp co-cropping mode, accurately determine the nitrogen application amount of the slow-release nitrogen fertilizer and the nitrogen reduction effect of the slow-release nitrogen fertilizer compared with the conventional nitrogen fertilizer, integrate a slow-release nitrogen fertilizer application strategy for reducing the nitrogen application amount of the rice in the rice-shrimp co-cropping mode, and realize the operation and optimization of the rice nitrogen fertilizer in the rice-shrimp co-cropping mode.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a slow-release nitrogen fertilizer application method for reducing the dosage of the rice nitrogen fertilizer in the rice-shrimp co-cropping mode.
The invention provides a method for determining the nitrogen application amount of a slow-release nitrogen fertilizer for rice in a rice-shrimp co-cropping mode, which is characterized by comprising the following steps of:
Under the condition that the phosphorus fertilizer and the potassium fertilizer are applied according to conventional production, the conventional nitrogen fertilizer is sequentially provided with different nitrogen application amounts from low to high: F. f+ G, F + G, F +3Gkg N/hm 2, wherein F=0, G is more than or equal to 75 and less than or equal to 100, and a corresponding unitary quadratic equation A1 is obtained by fitting a parabolic linear relation between the rice yield and the conventional nitrogen fertilizer nitrogen application amount, so that the theoretical highest yield Y1 of the rice and the required conventional nitrogen fertilizer nitrogen application amount X1 are obtained;
Under the conventional production and application of phosphorus and potassium fertilizers, the slow-release nitrogen fertilizer with different nitrogen application amounts is sequentially arranged from low to high: f ', F ' +G ', F ' +2G ', F ' +3G ' kg N/hm 2, wherein F ' =0, 75 is less than or equal to G ' and less than or equal to 100, and a corresponding unitary quadratic equation A2 is obtained by fitting a parabolic linear relation between the rice yield and the slow-release nitrogen fertilizer nitrogen application amount, so as to obtain the theoretical highest yield Y1' of the rice and the required slow-release nitrogen fertilizer nitrogen application amount X1';
substituting the theoretical maximum yield Y1 of the rice under the conventional nitrogen fertilizer application into a unitary quadratic equation A2 to obtain the nitrogen application amount X2 of the required slow-release nitrogen fertilizer.
Further, the unitary quadratic equation A1 is y=ax 2 +bx+c, where X is the nitrogen application amount of the conventional nitrogen fertilizer, a is a quadratic term coefficient, b is a first order term coefficient, and c is a constant term.
Further, the unitary quadratic equation A2 is Y '=a' X '2 +b' X '+c', where X 'is the nitrogen application amount of the slow-release nitrogen fertilizer, a' is a quadratic term coefficient, b 'is a first order term coefficient, and c' is a constant term.
Further, the phosphorus fertilizer and the potassium fertilizer are respectively calcium superphosphate and potassium sulfate, and the application amount is respectively 75kg P 2O5/hm2、112.5kg K2O/hm2.
Further, the conventional nitrogen fertilizer is urea.
Further, the slow-release nitrogen fertilizer is resin coated urea, and consists of resin coated urea with release period of 60d and 120d according to the mass ratio of 1:1.
In a second aspect of the invention, a determination method of a nitrogen reduction effect of a slow-release nitrogen fertilizer for rice in a rice-shrimp co-cropping mode is provided, the determination method of the first aspect of the invention is adopted to obtain a conventional nitrogen fertilizer nitrogen application amount X1 and a slow-release nitrogen fertilizer nitrogen application amount X2 for rice in the rice-shrimp co-cropping mode, and the slow-release nitrogen fertilizer nitrogen reduction effect is that
Compared with the prior art, the method has the advantages that the linear relation between the rice yield and the nitrogen application amount of the conventional nitrogen fertilizer and the slow-release nitrogen fertilizer in the rice-shrimp co-cropping mode is studied, the difference value of the nitrogen application amount of the conventional nitrogen fertilizer and the slow-release nitrogen fertilizer is determined under the same rice yield level, the nitrogen reduction effect of the slow-release nitrogen fertilizer is clear compared with that of the conventional nitrogen fertilizer, and further the rice nitrogen fertilizer operation optimization of the rice-shrimp co-cropping mode is realized by replacing the conventional nitrogen fertilizer application with the slow-release nitrogen fertilizer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a graph of nitrogen reduction effect of slow-release nitrogen fertilizer applied to rice and a more conventional nitrogen fertilizer in a rice-shrimp co-cropping mode, wherein n=4, and r 2 0.05＝0.9025,R2 0.01 = 0.9801, and the sum represent significance at 0.05 and 0.01 levels, respectively; the conventional nitrogen fertilizer is urea, and the slow-release nitrogen fertilizer is resin coated urea.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, which should not be construed as limiting the scope of the present application. It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
Examples
The test was carried out in 2021, 6 to 10 months in the rice and shrimp co-farming production field of stamp market Jiangsu Puxing circulating agricultural development company, jiangsu province, the soil type is the de-submersible rice soil developed from lacustrine mother substance, and the texture is loam clay. The test shrimp is procambarus clarkia, the test rice variety is the Fengyouxiang of a medium-long rice variety suitable for a rice and shrimp co-cropping mode in Jiangsu province, the plant height is 120cm, and the whole growth period is 143d.
Setting two nitrogen applying types of slow-release nitrogen fertilizer and conventional nitrogen fertilizer under the rice and shrimp co-cropping mode, and respectively setting four kinds of rice nitrogen applying amounts of 0, 90, 180 and 270kg N/hm 2 under the two nitrogen applying types.
The treated rice is sowed and raised in the last ten days of 5 months each year, and transplanted to a field after the rice seedling age reaches 30 days, and the transplanting is wide-row narrow-plant, the row spacing is 30cm multiplied by 18cm, and 2 seedlings are planted in each hole.
Wherein the conventional nitrogen fertilizer is urea (the total N content is more than or equal to 46.4%), the slow-release nitrogen fertilizer is resin coated urea (the total N content is more than or equal to 44%, and the release period is 60d and 120d is composed of the mass ratio of 1:1), and the slow-release nitrogen fertilizer is applied to 0-15cm of plough layer soil all the day before rice transplanting.
The phosphate fertilizer is calcium superphosphate (the effective P 2O5 content is more than or equal to 16 percent), and the potash fertilizer is potassium sulfate (the effective K 2 O content is more than or equal to 52 percent); all the treated phosphorus and potassium fertilizers are also applied to 0-15cm of plough layer soil in the day before transplanting the rice, and the application amount is 75kg of P 2O5/hm2、120kg K2O/hm2 respectively.
After harvesting rice, the high stubble of the straw is 40cm, and other straws are crushed and uniformly covered on the ground surface. According to the actual straw yield of the tested rice variety Fengyouxiang in the test local rice and shrimp co-cropping mode, the straw returning amount is 10t/hm 2.
The procambarus clarkia larvae are put in according to the culture density of 6 ten thousand tails/hm 2 at the beginning of 5 months to 6 months each year. Young shrimps are firstly put into the shrimp furrows, and enter the rice field again after being put into the field, transplanted and rehydrated. The special feed (crude protein content is 30%) for procambarus clarkia is put in 6 to 8 months each year, the average feed amount is 750kg/hm 2, and the fishing of the shrimps in 9 ten days each year is completed.
The field moisture management is as follows: after the rice is transplanted, the water level of the field surface is 5cm, the water level in the jointing period is raised to 20 cm, the water level in the heading and grouting period is raised to 40cm, and after the grouting is finished, the water is drained and the field is sunned.
Effect example 1
The results of the measurement of various growth indexes of rice are shown in table 1, and the rice spike number, the grain number, the fruiting rate and the yield of the rice under the same nitrogen application amount are obviously higher than those of the conventional nitrogen fertilizer under the slow-release nitrogen fertilizer treatment. In addition, as shown in table 2, the number of rice Gao Fengmiao, leaf area index in heading stage, chlorophyll content in sword leaf in heading stage and biomass under the same nitrogen application amount are obviously higher than those of conventional nitrogen fertilizer treatment under the slow-release nitrogen fertilizer.
TABLE 1 Rice yield and its constituent factors under different nitrogen application amounts of slow-release nitrogen fertilizer and conventional nitrogen fertilizer in rice and shrimp co-cropping mode
Description: the conventional nitrogen fertilizer is urea, and the slow-release nitrogen fertilizer is resin coated urea; the same column of the table indicates that the difference is significant at the P <0.05 level.
TABLE 2 Rice Gao Fengmiao number, ear formation rate, leaf area index, leaf chlorophyll content and biomass of slow-release nitrogen fertilizer and conventional nitrogen fertilizer under different nitrogen application amounts in rice and shrimp co-cropping mode
Description: the conventional nitrogen fertilizer is urea, and the slow-release nitrogen fertilizer is resin coated urea; the same column of the table indicates that the difference is significant at the P <0.05 level.
Effect example 2
By fitting the linear relation of the unitary quadratic equation of the rice yield and the nitrogen application amount, the unitary quadratic equation of the conventional nitrogen fertilizer applied is obtained as Y=0.0656X 2 +27.9798X+5120.5191, and the unitary quadratic equation of the slow-release nitrogen fertilizer applied is obtained as Y ' = 0.0995X ' 2 +38.7138X ' +5139.9794, as shown in figure 1, the conventional nitrogen fertilizer in the rice and shrimp co-cropping mode is found to reach the highest yield 8104kg/hm 2 under the nitrogen application amount of 213kg N/hm 2; the slow-release nitrogen fertilizer reaches the highest yield of 8904kg/hm 2 under the condition of 194kg N/hm 2 of nitrogen application quantity; when the maximum yield of 8104kg/hm 2 of the conventional nitrogen fertilizer rice is reached, the required nitrogen application amount of the slow-release nitrogen fertilizer is 105kg N/hm 2, and compared with the nitrogen application amount of 213kg N/hm 2 of the conventional nitrogen fertilizer, the nitrogen application amount is reduced by 50.7%, namely the nitrogen reduction effect of the slow-release nitrogen fertilizer is 50.7% compared with that of the conventional nitrogen fertilizer.
Meanwhile, the rice nitrogen fertilizer bias productivity, the agronomic efficiency and the apparent utilization rate under the same nitrogen application amount are all obviously higher than those of the conventional nitrogen fertilizer treatment under the slow-release nitrogen fertilizer, and the results are shown in table 3. In addition, the test treatments close to the theoretical yield 8104kg/hm 2 of rice were 90kg N/hm 2 of slow-release nitrogen fertilizer and 180kg N/hm 2 of conventional nitrogen fertilizer, respectively. When the nitrogen application amount of the slow-release nitrogen fertilizer is 90kg N/hm 2, the rice nitrogen fertilizer bias productivity is 86.89kg/kg, the nitrogen fertilizer agronomic efficiency is 29.79kg/kg, and the apparent nitrogen fertilizer utilization rate is 61.39%; when the conventional nitrogen fertilizer has a nitrogen application amount of 180kg N/hm 2, the nitrogen fertilizer bias productivity is 44.94kg/kg, the nitrogen fertilizer agronomic efficiency is 16.38kg/kg, and the apparent utilization rate of the nitrogen fertilizer is 30.15%. From the results, the productivity, agronomic efficiency and apparent utilization rate of the rice nitrogen fertilizer are obviously higher than those of the conventional nitrogen fertilizer 180kg N/hm 2 under the condition of 90kg N/hm 2 of the slow-release nitrogen fertilizer, which is an important reason that the slow-release nitrogen fertilizer can promote the rice growth under the condition of lower nitrogen application amount and obtain the same rice yield level as the conventional nitrogen fertilizer.
TABLE 3 Rice nitrogen fertilizer bias productivity, agronomic efficiency and apparent utilization ratio under different nitrogen application amounts of slow-release nitrogen fertilizer and conventional nitrogen fertilizer in rice and shrimp co-cropping mode
Description: the same column of different lowercase letters in the table indicates that the difference is significant at the P <0.05 level; the conventional nitrogen fertilizer is urea, and the slow-release nitrogen fertilizer is resin coated urea; nitrogen bias productivity (kg/kg) =rice yield in nitrogen application zone (kg/hm 2)/nitrogen application amount (kg/hm 2); nitrogen fertilizer agronomic efficiency (kg/kg) =rice yield in nitrogen application area (kg/hm 2)/rice yield in nitrogen-free area (kg/hm 2); apparent nitrogen fertilizer utilization (%) = [ nitrogen absorption of rice in nitrogen application area (kg/hm 2) -nitrogen absorption of rice in nitrogen-free area (kg/hm 2) ]/nitrogen application amount (kg/hm 2) ×100%.
The numerical values set forth in these examples do not limit the scope of the present invention unless specifically stated otherwise. In all examples shown and described herein, unless otherwise specified, any particular value is to be construed as exemplary only and not as limiting, and thus, other examples of exemplary embodiments may have different values.
Claims (4)
1. The method for determining the nitrogen application amount of the slow-release nitrogen fertilizer of the rice in the rice-shrimp co-cropping mode is characterized by comprising the following steps of:
Under the condition that the phosphorus fertilizer and the potassium fertilizer are applied according to conventional production, the conventional nitrogen fertilizer is sequentially provided with different nitrogen application amounts from low to high: F. f+ G, F + G, F +3G kg N/hm 2, wherein F=0, G is more than or equal to 75 and less than or equal to 100, and a corresponding unitary quadratic equation A1 is obtained by fitting a parabolic linear relation between the rice yield and the conventional nitrogen fertilizer nitrogen application amount, so that the theoretical highest yield Y1 of the rice and the required conventional nitrogen fertilizer nitrogen application amount X1 are obtained;
Under the conventional production and application of phosphorus and potassium fertilizers, the slow-release nitrogen fertilizer with different nitrogen application amounts is sequentially arranged from low to high: f ', F ' +G ', F ' +2G ', F ' +3G ' kg N/hm 2, wherein F ' =0, 75 is less than or equal to G ' and less than or equal to 100, and a corresponding unitary quadratic equation A2 is obtained by fitting a parabolic linear relation between rice yield and slow-release nitrogen fertilizer nitrogen application amount, so that the theoretical highest yield Y1' of rice and the required slow-release nitrogen fertilizer nitrogen application amount X1' are obtained;
Substituting the theoretical maximum yield Y1 of the rice under the conventional nitrogen fertilizer application into a unitary quadratic equation A2 to obtain the nitrogen application amount X2 of the required slow-release nitrogen fertilizer;
the phosphorus fertilizer and the potassium fertilizer are respectively calcium superphosphate and potassium sulfate, the application amount is respectively 75kg of P 2O5/hm2、120kg K2O/hm2, the conventional nitrogen fertilizer is urea, the slow-release nitrogen fertilizer is resin coated urea, and the slow-release nitrogen fertilizer consists of resin coated urea with release periods of 60 d and 120 d according to a mass ratio of 1:1.
2. The method of claim 1, wherein the unitary quadratic equation A1 is Y = aX 2 + bX + c, where X is the nitrogen application of a conventional nitrogen fertilizer, a is a quadratic term coefficient, b is a first order term coefficient, and c is a constant term.
3. The method according to claim 1, wherein the unitary quadratic equation A2 is Y '=a' X '2 +b' X '+c', where X 'is the nitrogen application amount of the slow-release nitrogen fertilizer, a' is a quadratic term coefficient, b 'is a first order term coefficient, and c' is a constant term.
4. A method for determining nitrogen reduction effect of slow-release nitrogen fertilizer of rice in rice-shrimp co-cropping mode is characterized by comprising the following steps of,
Obtaining the conventional nitrogen fertilizer nitrogen application amount X1 and the slow-release nitrogen fertilizer nitrogen application amount X2 of rice in the rice-shrimp co-cropping mode by adopting the determination method of any one of claims 1 to 3, wherein the slow-release nitrogen fertilizer nitrogen reduction effect is as follows×100%。
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