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[1]MA Fang,ZHANG Weijiang,FENG Na,et al.Characteristics of Effective Precipitation and Water Requirements of Main Crops in Whole Growth Period in Guyuan[J].Research of Soil and Water Conservation,2022,29(01):205-212+223.

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Characteristics of Effective Precipitation and Water Requirements of Main Crops in Whole Growth Period in Guyuan

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 205-212+223 Column: Public date: 2022-02-20

Title:: Characteristics of Effective Precipitation and Water Requirements of Main Crops in Whole Growth Period in Guyuan

Author(s):: MA Fang^1,2, ZHANG Weijiang¹, FENG Na¹, HUANG Yan¹; (1.School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2.Haiyuan County Water Authority,Haiyuan, Ningxia 755200,China)

Keywords:: Guyuanof Ningxia; effective rainfall; crop water requirement; water loss index

CLC:: S161.6

DOI:: -

Abstract:: Due to the perennial lack of rainfall resources in arid areas, it provides theoretical support for improving the efficient utilization of rainfall resources in arid areas and more accurately grasping the balance of water supply and demand of main crops in this region. In effective rainfall recommended by the United States Department of Agriculture(USDA)Soil Conservation Bureau and the amount of reference crop evapotranspiration calculation method recommended by UN's Food and Agriculture Organization(FAO), the linear analysis, Mann-Kendall test and the wavelet analysis method were used to examine spatial and temporal variations of effective rainfall and water demand evalution trend of the three main crops nearly 60 years. The results are as follows.(1)The average effective precipitation in the growth period of the three crops ranged from 68.8～177 mm, the effective precipitation in the growth period of corn and potato showed the decreasing trend, and the effective precipitation in the growth period of spring wheat showed the increasing trend, and the effective precipitation period showed a big-small-big change pattern.(2)The average water demands of the three crops in the growth period mainly distributed in the range of 233.7～439.3 mm, and the water demands in the growth period showed an upward trend, which were 2.4,0.8,2.3 mm/decade, respectively. The water demand cycle also showed a 'big-small-big' change pattern.(3)The average water-deficit indexes of potato, maize and spring wheat were -38.0%, -57.5% and -58.7%, respectively, and maize and spring wheat were more dependent on irrigation than potato. These research results can provide theoretical basis for the rational planting and irrigation of three crops in Guyuan, and provide more bases for the development of the main characteristic agricultural products and the improvement of farmers' economic income.

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Last Update: 2022-02-20