Root layer moisture monitoring-based winter wheat regulated deficit irrigation method

Abstract

The invention relates to a root layer moisture monitoring-based winter wheat regulated deficit irrigation method. The method comprises the following steps of ensuring that the average relative water content in 0-20cm soil is not lower than 80 percent in the seeding stage; irrigating when the average relative water content in 0-40cm soil is lower than 65 percent before overwintering from emergence of seedlings; irrigating when the average relative water content in 0-40cm soil is lower than 60 percent from overwintering to the standing stage; irrigating when the average relative water content in 0-60cm soil is lower than 60 percent from the jointing stage to the booting stage; irrigating when the average relative water content in 0-100cm soil is lower than 65 percent from the earing stage to 10 days after the flower; irrigating when the average relative water content in 0-100cm soil is lower than 55 percent from 11 days after the flower to the maturation stage; the irrigation water amount each time reaches field capacity. According to the method, the yield, water use efficiency and irrigation water use efficiency of the winter wheat can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of winter wheat irrigation, and in particular relates to a method for regulating deficit irrigation of winter wheat based on root layer water monitoring. Background technique [0002] With the growth of population and the aggravation of water pollution, the shortage of water resources is becoming more and more serious. Irrigation water accounts for more than 70% of the world's water resources, so the development of water-saving irrigation is of great significance. Regulated Deficit Irrigation (RDI) is an efficient water-saving irrigation technology proposed by the Australian Institute of Sustainable Irrigation Agriculture in the mid-1970s and first applied to fruit trees. The research on RDI in my country started in 1988, and the research object was peach trees. At the end of the last century, Chinese scholars applied RDI to the field crop corn. At the beginning of this century, a series of results were ob...

AI Technical Summary

Problems solved by technology

[0004]1) Regulated deficit irrigation is implemented based on the growth period, such as: irrigation at the jointing stage, irrigation at the booting stage, or irrigation at the flowering stage, without considering the effects of the plant itself and the root layer soil moisture status

[0005]2) Judgment of water deficit is based on empirical standards, such as: plant or soil form, lacking precise quantitative indicators

Affected by factors such as precipitation, evaporation, and radiation, the moisture content of the plow layer soil fluctuates greatly, which cannot accurately reflect the water supply capacity of the root layer soil to winter wheat.

[0008]2) The monitoring depth is fixed, which cannot reflect the absorption characteristics of soil moisture by the root system

[0009]3) Static monitoring limited to the main growth period cannot reflect the dynamic characteristics of soil water supply, and it is easy to make the root system of crops in water-deficient or supersaturated soil

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