Effect of N application on N accumulation in seeds of Brassica napus L. cultivar 'Yangyou No. 4'

摘要

Trials were carried out in 2003-2004 to investigate the N accumulation in seeds of rapeseed cultivar "Yangyou No. 4" under four N applications. The main results were as follows. (1) The Richards equation could be used to describe the process of N accumulation in seeds (R2=0.9970**-0.9995**); (2) The rate, time and total amount of N accumulation in seeds increased along with the increase of N fertilizer application. Seventy percent of the increased N accumulated in middle stage and 30% in late stage;(3)The ratios of N accumulation time and amount in early stage were 60%-50% and 40%-30% respectively. Both of them decreased along with the increase of N fertilizer application. In middle and late stages, the ratios of N accumulation times were all about 20%-25%, and those for the amounts were 50%-55% and 10%-15%, respectively. They all increased with the increase of N fertilizer application.