密度与施肥对耐密型玉米组合sw6176生长的影响

Effects on Planting Density and Fertilization on Growth of High Density Tolerance Maize sw6176

运用三元二次正交回归旋转组合设计,研究耐密型玉米新组合sw6176在贵州西南部高海拔地区产量与播种时期、种植密度及施肥量(N、P、K)等主要栽培因素间的关系,建立了各因素与产量指标的数学模式:Y=27.54033-1.08301 X1+1.55888 X2+0.21569 X3-0.15528 X21+0.79908 X22-0.15528 X23-1.13750 X1X2-1.01250 X1X3+0.18750 X2X3,确立了耐密型玉米新组合sw6176(素176×正696)在贵州西南部高海拔地区高产栽培合理的播种时期、种植密度和施肥量的优化方案:播种时期是4月10日,密度为4341株/667m2,施N量为39.97kg/667m2;优化方案最高产量可达14287.14kg/hm2。各因素对耐密型玉米新组合sw6176产量的影响是种植密度>播种时期>施肥量。

With the application of ternary quadratic orthogonal regression rotary combination design,the effects of sowing period and cultivation density and fertilizer application rate（N、P、K）on the yield of high density tolerance maize combinations sw6176 in Southwest High Altitude Region of Guizhou were investigated.The mathematical model between the main cultivation factors and the yield is Y=27.54033-1.08301X1＋1.55888X2＋0.21569X3-0.15528X12＋0.79908X22-0.15528X32-1.13750X1X2-1.01250X1X3＋0.18750X2X3.The optimal sowing period for high-yield was April 10 t h and cultivation density was 4341plants/667m2 and amount of N was 39.97kg/667m2,.The maximum yield acquired by the comprehensive measure might reach as high as 14287.14kg/hm2.The best effect order was cultivation densitysowing periodfertilizer application rate.