A method for optimizing crop water productivity in saline farmland

Abstract

The invention discloses a method for optimizing the water productivity of crops in saline farmland, which comprises the following steps: 1: combining crop evapotranspiration, setting no less than 3 groups of irrigation and rinsing water volumes, and calculating the leaching ratio; 2: measuring irrigation water Conductance, salt tolerance threshold and yield reduction coefficient of crops, combined with the leaching ratio to determine the degree of yield reduction; 3: Analyze the unit water productivity of saline farmland crops according to the leaching ratio, evapotranspiration, and yield reduction degree; 4: Determine the leaching ratio of multiple groups According to the relationship between the unit water productivity of the corresponding saline farmland crops, three fitting coefficients are obtained; 5: Determine the maximum unit water productivity and the optimal leaching ratio of the saline farmland crops according to the fitting coefficients; 6: According to the best The rinse ratio determines the optimal irrigation rate. The invention reduces the difficulty of optimizing the water productivity of farmland crops, requires fewer parameters and is simple and easy to measure, thereby effectively saving the irrigation amount per unit area of ​​saline farmland and increasing crop yield.

Description

technical field [0001] The invention belongs to the technical field of agricultural water and soil engineering, and relates to a method for optimizing crop water productivity in saline farmland. Background technique [0002] With the rapid development of my country's economy and society, the demand for water resources in the whole society continues to increase, resulting in the occupation of irrigation water resources. The shortage of irrigation water resources has become a bottleneck restricting the sustainable development of agriculture in saline areas. Improving crop water productivity through various water-saving measures is the ultimate goal of efficient water-saving technology and sustainable agricultural development. Optimizing crop water productivity is of great significance to water resource utilization, management and decision-making in salinized areas. Clarifying the characteristics of crop water productivity changes in saline farmland can make targeted water res...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for optimizing crop water productivity in saline farmland, which solves the problems in the prior art that the measurement process of the field test is relatively complicated or difficult to directly measure, and the numerical simulation model does not require professional basic knowledge of the user. Difficult to analyze and optimize crop water productivity due to high requirements

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