播种量与施肥水平对黔油28号免耕栽培产量的影响

Effects of Different Seeding Rate and Fertilization Level on Yield of Qianyou 28 in No-tillage Cultivation

为探明黔油28号免耕点播种植条件下的适宜播种量及施肥水平,运用最优混合设计方法进行不同播种量、氮肥、磷肥及钾肥施用水平试验,建立多元回归模型并利用计算机模拟,分析各试验因子对黔油28号产量的影响。结果表明:试验因素对产量的影响程度为氮肥>播种量>钾肥>磷肥;免耕点播单产140kg/667m^2以上的优化农艺措施为播种量269.12~280.88g/667m^2,N 21.91~23.09kg/667m^2,P_2O_512.17~12.83kg/667m^2,K_2O 15.92~16.88kg/667m^2。油菜成株率随播种量增加而降低,成熟期适宜的田间成株数为1.26万~1.82万株/667m^2。

In order to explore the suitable seeding rate and fertilization level of Qianyou 28 in no-tillage direct seeding cultivation,the effects of seeding quantity,nitrogenous fertilizer,phosphate fertilizer and potash fertilizer were studied by optimum mixed test design.The multiple regression model was established and computer simulation was employed to analyze the effects of various factors on yield of Qianyou 28.Results：Factors influencing the yield followed the sequence of N〉sowing quantity〉K〉P.The optimized agronomic measures for yield more than 140kg/667m2 included seeding rate 269.12～280.88g/667m2,N 21.91～23.09kg/667m2,P_2O_5 12.17～12.83kg/667m2 and K_2O 15.92～16.88kg/667m2.The plant surviving rate of rape decreased with seeding rate increasing,the suitable field planting density in mature period was 12 600～18 200individuals/667m2.