A Comparative Study on Transplanting and Direct Seeding of Rapeseed Blanket Seedling

【Objective】The study was to explore the suitable transplanting date of transplanting rapeseed from blanket seedlings and the latest transplanting date for high-yield cultivation standard, and to guide the large-scale production of transplanting rapeseed from blanket seedlings. 【Method】The variety of Ningza 1818 ( Brassica napus L. ) was chosen as the experiment material. In this experiment, two planting patterns- transplanting and direct-seeding were set and each pattern was set with six dates, i.e. October 15, October 20, October 25, October 30, November 4 and November 9, to study their yield level and economic benefits.【Result】Results showed that the seed yield of the transplanted rapeseed from the blanket seedlings increased first and then decreased with the delay of transplanting date, and the seeds transplanted on October 25 gained a highest yield, reaching 3810.1 kg/hm2. The results of path analysis showed that the yield of rapeseed transplanted from blanket seedlings was mainly affected by the number of pods while the yield of direct-seeding rapeseed was mainly affected by the seeds number per pod. Regression analysis result showed that there was a quadratic curve relationship between the yield and the transplanting date. According to the regression equation, it could be figured out that the highest yield appeared on October 28.【Conclusion】Taking the highest yield decreased by 5% or less as the standard, it could be obtained that the suitable transplanting period was from October 18 to November 7, and 3 000 kg/hm2 was set as the minimum standard of high yield in production it could be obtained that the latest transplanting date for high-yield cultivation was November 16.