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Forecast of runoff and estimation of nitrogen and phosphorus loss in paddy field

A technology of runoff and paddy fields, applied in the direction of forecasting, testing water, material inspection products, etc., can solve the problems of only suitable flowmeters, difficult use, and high cost of flowmeters, so as to avoid accuracy problems, low equipment requirements, and reduce The effect of fees

Active Publication Date: 2019-01-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current flow metering technology has the following drawbacks: 1. A flow meter with high sensitivity begins to count when there is a slight rainfall, but often a small amount of rainfall cannot cause runoff in the paddy field; The small runoff is not sensed when it is generated, so it cannot be counted in time and the flow rate is low; 3. The cost of installing the flowmeter is high, and the flowmeter is only suitable for small area tests, and it is difficult to install and use flowmeters for large area tests

Method used

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  • Forecast of runoff and estimation of nitrogen and phosphorus loss in paddy field
  • Forecast of runoff and estimation of nitrogen and phosphorus loss in paddy field
  • Forecast of runoff and estimation of nitrogen and phosphorus loss in paddy field

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Embodiment 1

[0046] The runoff is calculated with the 2015 rainfall data of the test pit, and the Shanghai area is used as the application area of ​​the present invention, and the method of the present invention is used to predict the farmland runoff of the paddy field in this area. The steps of the present invention are as follows:

[0047] 1. Select rice fields in the Yangtze River Delta region, the height of the ridge is 20cm, and the height of the surface water after rice irrigation is about 10cm.

[0048]2. Set up chemical fertilizer and organic fertilizer treatment. For chemical fertilizer treatment, apply 300 kg of pure nitrogen, 60 kg of phosphorus pentoxide and 60 kg of potassium oxide with urea, superphosphate, and potassium chloride as fertilizer sources per hectare; for organic fertilizer treatment, apply per hectare The application of chicken manure organic fertilizer depends on the nitrogen content in chicken manure, and the application amount of nitrogen in organic fertilize...

Embodiment 2

[0056] The test site is located in a plot in Liantang Town, Qingpu District, Shanghai. The height of the field ridge is 20cm, and the height of the field surface water after rice irrigation is about 10cm. Set up chemical fertilizer and organic fertilizer treatment. For chemical fertilizer treatment, apply 300 kg of pure nitrogen, 60 kg of phosphorus pentoxide and 60 kg of potassium oxide per hectare with urea, superphosphate, and potassium chloride as fertilizer sources; apply chicken per hectare for organic fertilizer treatment. Manure organic fertilizer depends on the nitrogen content in chicken manure, the application amount of nitrogen in organic fertilizer is consistent with that of chemical fertilizer, and the runoff generated by the land plot is simulated according to the rainfall and runoff equation. By testing the concentration of nitrogen and phosphorus in the runoff water of different treatments and calculating the annual loss of nitrogen and phosphorus in different ...

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Abstract

A method for predicting runoff and estimating nitrogen and phosphorus loss in paddy field features that a runoff yield model of rainfall and runoff in paddy field is established, and the runoff yieldmodel is Ri = 0.899 x Pi-14.017 or Ri=0. 899 * Qi14.017, Pi represents a single rainfall at intervals of rainfall, Qi represents the total rainfall over several consecutive days of continuous rainfall, Ri is runoff generated based on rainfall, when runoff occurs in the paddy field, at the outlet of the paddy field, when continuous rainfall generates runoff for several consecutive days, at that paddy field outlet, the diameter of the water is taken out once, the nitrogen and phosphorus concentrations obtained from the i-th sampling are represented by Cni and Cpi respectively, the total nitrogenloss of paddy field in one year is calculated by the formula described in the description. Total phosphorus loss from paddy fields in a year is calculated using the formula described in the description. In the formula, i is the ith sampling, j is the total number of sampling times in a year, and 100 is the unit conversion factor. Compared with the prior art, the method of the invention can directly predict the runoff generated by the paddy field through the rainfall, avoids the problem of the precision when the flowmeter is installed in the field to calculate the runoff, and simultaneously reduces the cost of installing the runoff meter.

Description

technical field [0001] The invention relates to the technical field of hydrological prediction, in particular to a method for predicting paddy track flow and estimating nitrogen and phosphorus loss. Background technique [0002] Rice (Oryza sativa) is one of the most important food crops in my country. After the Green Revolution, the use of a large amount of chemical fertilizers and pesticides has ensured the continuous growth of rice production in my country. The amount of nitrogen fertilizer applied to some rice fields in Jiangsu and Shanghai is as high as 350kg N / hm 2 , while the nitrogen utilization rate of rice is only about 25%, and the utilization rate of phosphorus fertilizer is only 15%-25%. During the rice planting process in my country, the paddy fields are flooded most of the time, especially during the rainfall process, it is easy to generate surface runoff drainage. Therefore, the nitrogen and phosphorus input in the fertilization of the paddy fields are lost ...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02G01N33/18
CPCG01N33/18G06Q10/04G06Q50/02
Inventor 沙之敏陈平曹林奎
Owner SHANGHAI JIAO TONG UNIV
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