黄土旱塬玉米产量与土壤水分关系数学模型研究

Study on the Relationship Model Between the Yield of Spring Corn and Soil Moisture in Non-irrigated Plateau of Loess

采用田间遮雨棚下模拟土柱的试验方法和田间小区试验方法，对黄土旱源长武塬区不同土壤水分处理下玉米产量与土壤水分关系进行了研究．结果表明，无论是模拟土柱试验中，相对生物量、相对经济产量与土壤水分保证率之间的关系，或者相对生物产量、相对经济产量与相对耗水量之间的关系；还是大田小区试验中，玉米产量与耗水量之间的关系，或相对产量与相对耗水量之间的关系，它们都遵循如下抛物线变化规律：ｙ＝ａｘ２＋ｂｘ＋ｃ，ａ、ｂ、ｃ为待定常数．

Two experiments both of simulation under rainproof shelter and plot in field were done to study the relationship between the yield of spring corn and soil moisture in the different treatments of water supply in Non-irrigated Plateau of Loess.The results showed that,the relationship between the relative biomass or grain yield and the soil moisture,or the relationship between the relative biomass or grain yield and the water consumption in the simulation experiment under rainproof shelter in field ;and the relationship between the relative grain yield and the relative water consumption in the field plot experiment, they were described by a parabola, namely, y = ax2 + bx + c, a and b and c were constants.