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Model for forecasting multi-dimensional flux migration and transformation of fertilizer urea nitrogen in paddy field

A technology of migration and transformation, urea nitrogen, applied in special data processing applications, instruments, electrical digital data processing, etc.

Inactive Publication Date: 2011-06-08
ZHEJIANG UNIV
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Problems solved by technology

In the early days, there were many classic mathematical models to simulate the behavior of nitrogen in farmland, but the calibration of the parameters in the model was obtained under specific farmland conditions based on a small amount of data. Whether the parameters are still applicable under different conditions has become a modeling debate. one of the points

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  • Model for forecasting multi-dimensional flux migration and transformation of fertilizer urea nitrogen in paddy field
  • Model for forecasting multi-dimensional flux migration and transformation of fertilizer urea nitrogen in paddy field
  • Model for forecasting multi-dimensional flux migration and transformation of fertilizer urea nitrogen in paddy field

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Embodiment 1

[0064] Embodiment 1: Jiaxing Shuangqiao Farm, Zhejiang Province

[0065] Calibration and verification data of the model based on the field observation data of Jiaxing comprehensive test site for 3 consecutive years. According to the results of multi-point field experiments, the vertical saturated hydraulic conductivity of the model is taken as 5.4mm day -1 , the lateral infiltration rate is 0.34*(field surface water depth + daily rainfall)-12.6, mm day -1 , The reference values ​​of rice crop coefficients include: the initial coefficient is about 1.05, the mid-term coefficient is about 1.20, and the late coefficient is 0.90-0.60.

[0066] This model directional and quantitatively estimated the flux of urea nitrogen applied to rice fields and transformed into water-soil-air-planting. The final calibration parameters are shown in Table 3. The simulation results found that at the conventional fertilization level of 180kg N hm -2 Under the treatment conditions, the distribution...

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Abstract

The invention discloses a model for forecasting multi-dimensional flux migration and transformation of fertilizer urea nitrogen in paddy fields, mainly considering destination balance problem of fertilizer nitrogen, emphasizing effects to water environment, and protruding the migration of the fertilizer nitrogen to surface water and groundwater. The method is formed by coupling a water balance module and a nitrogen balance module. The nitrogen balance module comprises the nitrogen transformation processes such as urea hydrolysis, ammonia volatilization, nitrification, denitrification, fixing, mineralization, absorption and the like; the water balance module comprises the processes such as infiltration eluviation, lateral seepage and radial flow (containing drainage). The model disclosed by the invention can comprehensively simulate the effects of the nitrogen to the water environment during migration and transformation in the paddy field by using few parameters.

Description

technical field [0001] The invention relates to the field of agricultural non-point source pollution control and environmental protection, in particular to a model for predicting the migration and conversion of multidimensional fluxes of urea nitrogen from paddy field fertilizers. Background technique [0002] Agricultural activities are an important anthropogenic source of nitrogen pollution in surface and groundwater. Predicting nitrogen loss is a necessary prerequisite for controlling water pollution and developing agricultural management guidelines. Among crops, rice is the main consumer of nitrogen fertilizer, and mainly consumes urea nitrogen. Due to the long-term flooding of rice, urea nitrogen is rapidly hydrolyzed after being applied to the surface water of the field, which makes the rice field have the risk of loss throughout the growing season. Quantitative prediction of nitrogen loss is quite complicated, and it is necessary to conduct modeling research by compr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 梁新强聂泽宇叶玉适苏苗苗陈英旭
Owner ZHEJIANG UNIV
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