Analysis on the Correlation Effect of Soil,Fertilizer and Water in Xinjiang Irrigation Area from the Perspective of Storing Grain in the Ground
In order to explore the effects of soil,fertilizer and water factors on agricultural output in Xinjiang arid and purely irrigated agricul-tural irrigation area,this paper,from the new perspective of grain storage in the ground,applied stepwise regression statistical test method to screen and analyze multi-dimensional input factors and output indicators,and formed the relationship between the proportion of soil texture loam area,pure fertilizer application amount,irrigation water consumption and main crop yield in the irrigation area.Cobb-Douglas model was used to analyze the correlation effect of soil,fertilizer and water in irrigation area.The results indicate that a)the quality of cultivated land(based on the proportion of loam area),fertilization level and irrigation water consumption(i.e.soil,fertilizer and water)are the basic elements of the input-output system in irrigation areas.b)The order of marginal effects of cultivated land quality,fertilization level and irri-gation water usage on crop output in irrigation areas is:pure fertilizer application rate Δf＞irrigation water usage Δs＞proportion of soil tex-ture and loam area Δt.c)The order of the proportion coefficient of the impact of soil,fertilizer and water on crop output is Kirrigation water＞Kfertilization＞Kcultivated,reflecting the primary and secondary relationship between irrigation,fertilizer and soil texture conditions,indicating that soil,fertilizer and water are the core contents of high standard agricultural water conservancy.d)The optimization analysis of irrigation areas shows that the irrigation water consumption of 8 203 m3/hm2 is similar to the current situation,slightly higher than that the 5.98%of Xin-jiang's landmark irrigation water quota.The optimized fertilizer application rate of 260 kg/hm2 can save 15%compared to the current situa-tion.
the perspective of storing grain in the groundarid area of Xinjiangagricultural irrigation areacorrelation effect of soil,fertil-izer and watereffect analysis
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