Five double low (low erucic and glucosinate content) and two conventional (double high) rapeseed cultivars were used to
investigate their variation in
absorption and accumulation of nitrogen (N) and
phosphorus (P) in red yellow soil regions. The effects of N and P fertilizers on the biomass and seed yield of the cultivars were also studied. The double low cultivars including Zhongyou 119 and Zhongshuang No.4 possessed lower nitrogen content during the whole growth stage compared to the double high cultivar, Zhongyou 821. No significant difference in phosphorus content was found among the rapeseed cultivars involved. Absorption of nitrogen in seedling stage in the double low cultivars was higher than that in the double high cultivars which absorbed more in flowering stage. Absorption of phosphorus during the early growth stage was identical among the genotypes, but the conventional cultivars absorbed slightly more during the ripening stage. Reaction of biomass and seed yield to phosphorus fertilizer in the double high cultivars was found to be more sensitive than that in the double low cultivars.