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Method for determining rice field nitrogen fertilizer applying amount
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A technology of application rate and nitrogen fertilizer
Inactive Publication Date: 2015-02-04
INST OF SOIL SCI CHINESE ACAD OF SCI
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The critical threshold value determined by this method focuses on yield factors and does not involve environmental factors, and the process of determining the threshold value through nutrient indicators is relatively cumbersome, and soil and crop types have a greater impact on the threshold range, making it difficult to popularize and apply
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Embodiment 1
[0039] (1) The test site is located in Weidu Village, Dapu Town, Yixing City, Jiangsu Province (31°16′17.29″N, 119°55′23.92″E), where rice and wheat are rotated, and the traditional nitrogen application rate is about 270kg N ha -1 .
[0040] According to the traditional nitrogen application rate, 0%N, 30%N, 50%N, 70%N, 80%N, 90%N and 100%N treatments were set in the rice season, and each treatment was repeated 3 times. The phosphorus and potassium fertilizer in each treatment is 81kg ha -1 and used as base fertilizer in rice fields. Nitrogen, phosphorus and potassium fertilizers are conventional fertilizers, which are urea, general calcium and potassium chloride.
[0041] Experiments were conducted in 2011 and 2012, and the crop yield and environmental indicators of each treatment were recorded. Among them, according to the environment and farming characteristics of the target plot, the total nitrogen loss (that is, the sum of nitrogen runoff loss, ammonia volatilization lo...
Embodiment 2
[0049] (1) The test site is located in Weidu Village, Dapu Town, Yixing City, Jiangsu Province (31°16′16.71″N, 119°55′23.82″E). The land is rice-milk vetch rotation, and the traditional nitrogen application rate is about 270kg N ha -1 .
[0050] In the rice season, on the basis of milk vetch returning to the field, according to the traditional nitrogen application rate in the area, 0%N, 11%N, 22%N, 33%N, 44%N, 55%N and 100%N treatments were set respectively. Each treatment was repeated 3 times. The phosphorus and potassium fertilizer in each treatment is 81kg ha -1 and used as base fertilizer in rice fields. Nitrogen, phosphorus and potassium fertilizers are conventional fertilizers, which are urea, general calcium and potassium chloride.
[0051] The experiment was carried out in 2012, and the crop yield and environmental indicators of each treatment were recorded. Among them, according to the environment and farming characteristics of the target plot, the nitrogen runof...
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Abstract
The invention discloses a method for determining rice field nitrogen fertilizer applying amount. According to the method, it is firstly proposed that a straight line platform model of rice field nitrogen applying amount with the crop yield and environmental indexes is established, and reasonable rice field nitrogen applying amount is determined based on data information reflected by a straight line platform. By means of the rice field nitrogen fertilizer applying amount determined through the method, high yield of crops can be maintained, the problem of environmental pollution caused by excessive application of nitrogen fertilizer can be lowered effectively, and thus good balance between the yield and the ecological environment can be obtained.
Description
technical field [0001] The invention belongs to the field of agricultural fertilizers, and in particular relates to a method for determining the application amount of nitrogen fertilizer in paddy fields. Background technique [0002] At present, in my country's agricultural production, in order to obtain high crop yields, chemical fertilizers, especially nitrogen fertilizers, are widely used. However, irrational fertilization (mainly excessive application) is common. According to statistics, in 1999, only 1% of the counties in my country had an appropriate proportion of nitrogen, phosphorus and potassium fertilizers. Unreasonable fertilization will not only lead to the decline of crop yield and quality, and the reduction of economic benefits, but also easily lead to serious environmental pollution. [0003] The situation of irrational fertilization is particularly prominent in the eastern region, which is dominated by intensive agriculture. Taking the Taihu Lake area as an...
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