Abstract:

In order to study on yield of high grade hybridized rapeseed and operation model of nitrogen fertilizer in Brassica napus L. Experiment material was ‘Youyan 599’ and ‘SanBei 98’, study on effects of different applied time of nitrogen fertilizer on yield of high grade hybridized rapeseed were carried out through quadratic regression orthogonal gyration combination design in Brassica napus L. The results showed that: factor combination when ‘Youyan 599’ obtained maximum yield target was living rape fertilizer 89.27 kg/hm2, opening fertilizer 120 kg/hm2, 12th lunar month fertilizer 101.12 kg/hm2, total applied amount of nitrogen fertilizer was 310.39 kg/hm2, the percent of living rape fertilizer, opening fertilizer, 12th lunar month fertilizer were 28.76%, 38.66%, 32.58%, respectively. Factor combination when ‘SanBei 98’ obtained maximum yield target was living rape fertilizer 120 kg/hm2, opening fertilizer 120 kg/hm2, 12th lunar month fertilizer 37.55 kg/hm2, total applied amount of nitrogen fertilizer was 277.55 kg/hm2, the percent of living rape fertilizer, opening fertilizer, 12th lunar month fertilizer were 43.24%, 43.24%, 13.53%, respectively. Factor combination after two varieties were merged were living rape fertilizer 120 kg/hm2, opening fertilizer 120 kg/hm2, 12th lunar month fertilizer 76.23 kg/hm2, total applied amount of nitrogen fertilizer was 316.23 kg/hm2, the percent of living rape fertilizer, opening fertilizer, 12th lunar month fertilizer were 37.95%, 37.95%, 24.11%, respectively.