关键词: 玉米, 水肥模型, 科尔沁沙地

Abstract: The aim of this experiment designed by the general regressive method of rotary combination for building a quadratic equation was try to investigate the relationship between the corn yield and the soil water content,the application amounts of nitrogen and phosphate.There were 20 treatment plots in total and each plot was 4 m².The results show that the amounts of nitrogen and the soil water content are the sensitive factors for increasing corn grain yield in sandy cropland,but the phosphate takes a little role for it.If the soil water content,the amounts of N,the amounts of P is 67.5%,55 7 g·m^-2,36 7 g·m^-2,respectively,the highest corn yield will be 1 32 kg·m^-2under the experimental condition.A mathematical model composed of the soil water content(x₁),the amounts of nitrogen(x₂) and the amounts of phosphate(x₃) is as follow:Y=5.16+0.151x₁+0.284x₂-0.182x₃+0.199x₁x₂+0.403x₁x₃-0.215x₂x₃-0.193x₁²-0.415x₂²-0.002x₃².

Key words: spring corn, mathematical model of water and fertilizer, Horqin Sand Land