Abstract: In order to simplify fertilization methods and improve fertilizer use efficiency,a field experiment was conducted. The effects of controlled release N fertilizer on growth,development,dry matter accumulation,agronomic and economic characters and yield of Fengyou 10 were studied under field conditions. The results showed that compared with treatment N0,the different N fertilizer treatments could significantly increase green leaf number,seedling height,dry matter accumulation per plant and root shoot ratio at seedling stage. The total amount of dry matter accumulation increased with the progress of the growth process,and reached the maximum value at maturity. Dry matter accumulation rate of Fengyou 10 reached the peak during flowering stage to pod period,and the average accumulation rate of CN5 treatment was the highest,861.25 kg/(ha·d). The difference of chlorophyll spad reading increased gradually with the growth process among different treatments,and it reached a significant level at the flowering stage. At the same nitrogen rate of 210 kg/ha,the yield of the three treatments(CN5,CN4 and N1)were all high,when controlled release nitrogen fertilizer was applied either once(CN4)or two times(CN5),the yields were higher than conventional fertilization(N1). The difference of yield was not significant between CN4 and CN5 treatments, and yields were significantly higher respectively(with 20.36% and 22.39% increase)than control,and increased by 2.16% and 3.89% compared with N1. And there were significant increase of effective pod number than control with 94.4% and 86.3% respectively. This study proved that controlled release nitrogen fertilizer rate of 210 kg/ha and single basal application could benefit the rapeseed yield and simple and efficient in Huang-huai Area.

Key words: Rapeseed, Controlled release nitrogen fertilizer, Dry matter accumulation, Economic characters, Yield

CLC Number: 

• S143.1