Radish nitrogen fertilizer recommendation method for coordinating agronomy and environment

Abstract

The invention belongs to the technical field of agricultural resources and environments, and particularly relates to a radish nitrogen fertilizer recommendation method for coordinating agronomy and the environment. The radish nitrogen fertilizer recommendation method capable of coordinating the agronomy and the environment comprises the following steps: determining a relation model between an allowable nitrate nitrogen leaching loss amount of the environment and an allowable upper limit value of nitrate nitrogen concentration in underground water; determining the critical nitrogen applicationamount of the environment according to the allowable nitrate nitrogen leaching loss amount of the environment and the relation model between the nitrogen application amount and the nitrate nitrogen leaching loss amount; determining an agronomic critical nitrogen application amount according to the radish yield and a relation model between the nitrogen application amount and the radish yield; and determining the feasibility range of the nitrogen fertilizer application amount according to the agronomic critical nitrogen application amount and the environmental critical nitrogen application amount. According to the method, agronomic and environmental benefits are coordinated, and the environmental problems that the nitrate content of underground water exceeds the standard due to excessive nitrogen fertilizer application and the like are reduced to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of agricultural resources and environment, and in particular relates to a method for recommending radish nitrogen fertilizer for coordinating agronomy and environment. Background technique [0002] Fertilization is one of the important measures to ensure high-yield and high-quality radish. However, it is common for farmers to overuse nitrogen fertilizer in radish production. The amount of nitrogen applied in a single season is as high as 300kg N / ha, which far exceeds the nitrogen demand of vegetables, resulting in nitrogen use efficiency. Low, a large amount of nitrate nitrogen remains in the soil; coupled with rainfall and excessive irrigation, the nitrate nitrogen remaining in the soil is easily leached to deeper soil layers, posing a threat to the groundwater environment. Therefore, it is of great significance to determine the appropriate amount of nitrogen fertilizer to reduce the harm of nitrogen leachi...

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Problems solved by technology

[0004] However, since the determination of the environmental threshold nitrogen application rate in the above method is based on the average value of the environmental indicators of nitrogen application rates with no significant difference, this means that the environmental threshold nitrogen application rate is usually lower than the agronomic threshold nitrogen application rate (i.e. The amount of nitrogen applied when the yield is no longer significantly increased); however, we found in actual production that after continuing to increase the amount of nitrogen applied, the yield will actually continue to increase, but it is not significant, and nitrogen leaching does not pollute the environment; It can be seen that the existing method for determining the amount of nitrogen application is too conservative, and its essence is to obtain environmental benefits at the expense of yield to a certain extent.

[0005] In addition, the current solutions to the problem of nitrogen leaching in farmland are mostly focused on food crops or greenhouse vegetable systems, and radish is a crop that harvests underground rhizomes. The leaching solution has poor applicability; in addition, the radish planting process also has the production characteristics of excessive nitrogen fertilizer application, multiple irrigations during the growth period, and flood irrigation. These factors also make it difficult for the existing methods to determine the nitrogen application rate Accurate assessment of radish planting

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