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[1]HU Wei,LI Jun,SUN Jian,et al.Simulation of Grain Yield and Soil Desiccation of Spring Wheat and Corn Fields in Semi-Arid Area of Loess Plateau[J].Research of Soil and Water Conservation,2009,16(01):149-155,161.

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Simulation of Grain Yield and Soil Desiccation of Spring Wheat and Corn Fields in Semi-Arid Area of Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 16 Number of periods: 2009 01 Page number: 149-155,161 Column: Public date: 2009-02-20

Title:: Simulation of Grain Yield and Soil Desiccation of Spring Wheat and Corn Fields in Semi-Arid Area of Loess Plateau

Author(s):: HU Wei^1,2, LI Jun^1,3, SUN Jian¹, CHEN Yu¹, WANG Xue-chun¹, WANG Mei-yan¹; 1. College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Xinjiang Production and Construction Agricultural 5th Division 81 Regiment, Bole, Xinjiang 833411, China;
3. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China

Keywords:: semi-arid area of Loess Plateau; grain crop; WinEPIC model; grain yield; fertilization; available soil water amount; soil desiccation

CLC:: S512.1;S513;S152.7

DOI:: -

Abstract:: To provide scientific basis for sustainable development of local crop production, that was fit for the fertilization levels and crop and adapt to precipitation condition of the dryland in semi-arid area of Loess Plateau as well as beneficial to soil water sustainable utilization. Based on model databases establishment, the WinEPIC model was used to simulate yield and soil water effects of continuous spring wheat under different level fertilization treatments at Guyuan of semi-arid area of Loess Plateau. The simulated results show as following: (1) Grain yield of the continuous spring wheat and corn decline along with rainfall changes, and spring corn yield volatility was higher than spring wheat. (2) Compared to spring wheat, available soil water amounts in 0-7 m soil layers of spring corn was lower, and soil desiccation speed was faster. (3)Thickness and distributed depth of desiccated soil layers on grain crop fields increased gradually as grain crops growth years and the level of fertilization. Distribution depth of desiccated soil layers of spring corn field was 2-3 m of no fertilization and low fertilization, 2-4 m of medium fertilization and high fertilization treatments after spring corn growth 9,6,8 and 6 years respectively. Distribution depth of desiccated soil layers of spring wheat field was 2-3 m of no fertilization, low fertilization and medium fertilization treatments, 2-4 m of high fertilization treatments after spring wheat growth 11,8,6 and 8 years respectively, then only 0-2 m layer of soil moisture with the annual changes in rainfall. (4) From the yield stability, the degree of soil desiccation and soil moisture in grain crop fields sustainable use perspective into consideration, spring wheat is appropriate to plant in Guyuan dryland, and its fertilization apply amounts are N 60～90 kg/hm² and P₂O₅ 30～45 kg/hm².

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