How to determine the application amount of chemical fertilizer in farmland

Abstract

The invention discloses a method for determining the application amount of farmland chemical fertilizers, which comprises determining typical crops, selecting representative fields, measuring the N / P content in the soil of representative fields, and calculating the N / P applied per kilogram of output of typical crops Demand; based on the proportion of N / P in fertilizer, calculate the total amount of fertilizer required by typical crops in the region and the total amount of fertilizer required by all typical crops; determine whether the total annual fertilizer demand is greater than the annual planned total, If yes, go to the next step, otherwise output the total annual fertilizer demand and the total fertilizer demand of each typical crop; judge whether the maximum and minimum N / P demand typical crop planting area exceeds the planting quota, if so, go to the next step, otherwise , enter the final step; determine whether to adjust the planting area of ​​typical crops, if so, return to the step of the total amount of chemical fertilizer for each typical crop according to the N / P in the planned chemical fertilizer application amount, and verify the planting area; otherwise, use organic fertilizer to replace the excess value Calculate the difference between the annual planned total amount and the annual total fertilizer amount.

Description

technical field [0001] The invention relates to the fields of agricultural planting and ecological environment, in particular to a method for determining the application amount of farmland chemical fertilizers. Background technique [0002] Agricultural non-point source pollution is the main factor of my country's water environment pollution. Due to its extensiveness, latentness, randomness and ambiguity, it is difficult to control agricultural non-point source pollution. Although the state promulgated the policy of "zero" growth in the amount of farmland chemical fertilizers from 2015 to 2020, and most regions in my country have also achieved strict control of the total amount of farmland chemical fertilizers in the statistical data, the problem of agricultural non-point source pollution is still It is more serious. On the one hand, it is due to the long-term enrichment in the release of the unused amount in the soil. On the other hand, the current total amount control is a ...

AI Technical Summary

Problems solved by technology

Although the state promulgated the policy of "zero" growth in the amount of farmland chemical fertilizers from 2015 to 2020, and most regions in my country have also achieved strict control of the total amount of farmland chemical fertilizers in the statistical data, the problem of agricultural non-point source pollution is still It is more serious. On the one hand, it is due to the release of the unused amount accumulated in the soil for a long time. On the other hand, the current total amount control is a kind of static management. It is difficult to integrate the year-by-year changes in planting structure and planting area, and realize reasonable control according to local conditions.

Therefore, it is difficult to control agricultural non-point sources from the source by only relying on the area of ​​cultivated land to control the total amount of fertilizer application in farmland.

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