Change characteristics of soil moisture content under different planting patterns and evaluation on crop economic benefits

Abstract

In order to clarify the changes in the soil moisture content in different soil layers under different planting patterns, this paper uses the field experiment. This paper also analyzes the soil moisture content and crop yield and other related results under the treatment of three kinds of planting patterns of winter wheat-summer maize (T0), season spring maize (T1) and herbage-spring maize (T2) from 2010 to 2011 and evaluates the economic benefits. The results show that the annual yields under T0, T1 and T2 planting patterns are 12.2, 9.9 and 10.4t/hm2 respectively, and the total yield of T0 crops is 20.2% higher than that of T1 and T2. According to the analysis of economic benefits of wheat and maize purchase price and planting cost in 2011, the net incomes of T0, T1 and T2 planting patterns are 5679, 8690 and 12517 Yuan / hm2 respectively and the economic benefit of T0 planting pattern is 46.4% lower than that of T1 and T2. The soil water content of T1 and T2 planting patterns gradually increases with the soil depth, and the water change range of the two planting patterns is the same. The soil moisture content of the T0 planting pattern increases first and then decreases with the depth, and the water change range is lower than that of the T1 and T2 planting patterns. The test results show that the economic benefit of T0 planting pattern is 46.4% lower than the average value of T1 and T2. In the North China Plain, the possible choice to ensure food safety and minimize irrigation water is to plant the season spring maize, but it is necessary to increase the yield of spring maize by more than 20% based on the existing foundation through other measures.