Method for optimizing crop water productivity of salted farmland

Abstract

The invention discloses a method for optimizing the crop water productivity of a salted farmland, which comprises the following steps: 1, setting at least three groups of irrigation and leaching water quantities in combination with the crop evapotranspiration quantity, and calculating the leaching proportion; 2, measuring the conductivity of irrigation water, the salt tolerance threshold value of crops and the yield reduction coefficient, and determining the yield reduction degree by combining the leaching ratio; 3, analyzing the unit water productivity of the salted farmland crops according to the leaching ratio, the evapotranspiration amount and the production reduction degree; 4, determining the relationship between the multiple groups of leaching ratios and the unit water productivity of the corresponding salted farmland crops, and obtaining three fitting coefficients; 5, determining the unit water productivity maximum value and the optimal leaching ratio of the salt-soaked farmland crops according to the fitting coefficient; and 6, determining the optimal irrigation amount according to the optimal leaching proportion. According to the method, the difficulty of optimizing the water productivity of the farmland crops is reduced, required parameters are few and are simple and easy to measure, and therefore the irrigation amount of the salted farmland per unit area can be effectively saved, and meanwhile the crop yield is increased.

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

Images