| To explore the optimal sowing date, planting density and fertilizer dosage of Yunhua Oil Early Maturing No.1 which was special high quality rapeseed variety for Yunnan Province mountainous areas, and to realize the combination of the good breeding and high yield cultivation techniques. Using three-factor and three-level orthogonal test, we had studied the optimal sowing date, planting density and fertilizer dosage of Yunhua Oil Early Maturing No.1 and their effects on main agronomic traits and yield in four different altitude regions from August 2014 to April 2016. The effects of three factors on yield from big to small was A （sowing date） ＞B （planting density）＞C （urea dosage）, sowing date and planting density had a significant impacts on yield. Sowing date showed significant impacts on growth period, lodging index, powdery mildew disease index, effective pods per plant, grain number per pod, 1000-grain weight and yield per plant; effective pods per plant, 1000-grain weight and yield per plant decreased with increasing planting density; urea dosage had no significant impacts on the growth period and agronomic traits. The optimal sowing date, planting density and fertilizer dosage for Yunhua Oil Early Maturing No.1 in Yuxi rapeseed planting mountain area were August 25-30, (1.6-2.0)×104 plants /667m2 and urea 30-35 kg/667m2. |
