Study On The Suitable Sowing Date, Density And Fertilizer Of New Precocious Rapeseed Varieties

This paper studies the effect of interaction among sowing date, fertilizer and density on rapeseed growth, dry matter, SPAD, net photosynthetic, leaf number, leaf area index, yield and yield components, quality of rapeseed. The results showed that:1. Sowing on October 20, density 300000/hm~2, fertilizer 900 kg/hm~2 was the highest yield. If you want to compress the actual production of rapeseed growth period for several days, in the case of fertilizer 900 kg/hm~2 sowing in late October to early November, if mechanical harvesting, may be appropriate to increase the planting density.2. Sowing is the most important factor affecting canola growth period for several days, every 10 days delayed planting, rapeseed growth period shortened 8-9 days. Fertilizer plant height and number of branches affect a lesser extent than sowing date and density, plant height and primary branches are gradually decreased with the increase of density.3. Sown earlier, more fertilizer, the same number of leaves growing period, the amount of dry matter and leaf area index are all the greater.4. Seedling stage, budding stage, flowering stage SPAD value increased with fertilizer application rate increases substantially with increasing density decreases with the growth of SPAD value, with the delayed sowing of increases.5. Reasonable fertilizer can increase yield, and fertilizer under the same density, the lower the yield of the later sowing. With the increase of the number of pods per plant fertilizer and increased with increasing delays and sowing density is reduced. Fertilizer can promote the generation of protein but inhibited oil content increased.