不同施氮量和定苗密度对油菜机直播产量及效益的影响

Effects of Different Nitrogen Fertilizer Rate and Planting Density on Yield and Economic Benefits of Mechanical Direct Seeded Rape

采用二因素裂区试验设计,研究了机械直播条件下黔油28号不同施氮量和定苗密度对其产量、经济效益及经济性状的影响。结果表明:施氮量和定苗密度最佳处理为A3B3(氮肥15kg/667m2,密度2.0万株/667m2),其次为A4B3(氮肥20kg/667m2,密度2.0万株/667m2),其产量和经济效益好,群体经济性状协调;机械直播油菜的产量(y)与施氮量(x1)和定苗密度(x2)密切相关,建立其回归方程:y=1739.96+3.92x1+2.406x2-0.0011x1x2-0.00677x21-0.0838x22,同时建立产量与施氮量、产量与密度间回归方程:y=-0.00678x21+3.8826x1+1704.05,y=-0.0839x22+2.2401x2+2099.54。

Two factors and split--plot experimental design were applied to the effects of different nitrogen fertilizer rate and planting density on yield, economic benefits and economic traits of mechanial direct seeded rape, Qianyou 28. The results showed that the yield and economic beneftis of rape is A3B3（nitrogen fertilizer, 15kg/667m2 ; planting density, 20000 plants/ 667m2）, second is A4B3（nitrogen fertilizer,20kg/667m2 ; planting density, 20000 plants/667m2）, which has the good population to enhance the growth of rape in field. The regression equation of yield（Y） , nitrogen rate（X1） mechanical direct seeded rape and planting density（X2） is.. y= 1739. 96＋3. 92xl ＋2. 406x2--0. 0011xl x2 --0. 00677x12--0. 0838x2z ,meanwhile the regression equation of yield and nitrogen fertilizer, yield and planting density is： y= --0. 00678x12 ＋3. 8826xl ＋ 1704. 05, y= --0. 0839 x22 ＋2. 2401x2 ＋2099. 54.