Effect of Density and Nitrogen Fertilizer Application on Agronomic Traits and Yield of Rapeseed Variety Youyan 1707

The effects of different density (3×104、6×104、9×104 plant/hm2) or nitrogen fertilizer applied rates ((N)90、180、 270kg / hm2) on Youyan 1707 agronomic traits, yield component factor and grain yield were studied in the field. The results showed that there were significant differences of several plant traits (plant height,first effective branch height, secondary branch numbers and pod numbers per plant) between density or nitrogen fertilizer treatments, but no significant differences for first effective branch numbers, seeds per pod or thousand-grain weight. Grain yield had no significantly differences under the treatments of different density or nitrogen fertilizer. Higher yield relatively was received about 2 850～3 000kg / hm2 in the condition of M2N1 or M2N2 or M3N1. We suggested that reasonable density(6×104～9×104 plant/hm2) and nitrogen fertilizer (N below 180kg/hm2) were favourable to reduce labor power and save productivity cost in the moderate or upward soil fertility level.