[Objective] The aim was to research effects of N fertilizer reduction and application of N fertilizer （as base fertilizer） on rapeseed yield and N absorption. [Method] Based on Ganyouza No.5, the ratio of N, P2O5 andK2O was set at 1：0.5：0.5; N fertilizers were set involving reduced quantity at 150 kg/hm2 and preferred quantity at 180 kg/hm2; 100%, 80% and 60% of N fertilizers were applied as base fertilizers in the test respectively. In general, field tests were conducted to explore effects of reduced N fertilizer and application of N fertilizer as base fertilizer on rapeseed yield and N absorption. [Resalt] When applied N fertilizer as base fertilizer was the same, plant height, stem diameter, length of major inflorescence, number of effective branch, pod number per plant, seed number per pod, and biomass yield in group with preferred N quantity were significantly higher than those in group with reduced N fertilizer. Rapeseed yield and profits in group with preferred N quantity were signifi- cantly higher than those in group with reduced N fertilizer in field with moderate fertili- ty. In fields with higher fertility, however, the two factors were just a little higher. In group with reduced N fertilizer, use efficiency of N fertilizer, N uptake efficiency, par- tial factor productivity and harvest index of N were all significantly higher than those in group with preferred N fertilizer. Agronomic nitrogen use efficiency in group with preferred N fertilizer was significantly higher than that in group with reduced N fertiliz- er in field with moderate fertility and was significantly lower in field with high yield. With amounts of N, P and K fertilizers fixed, economic characters, yield constitution, yield, profits and N absorption in group, where 60% of N fertilizers were applied as base fertilizer, were significantly higher than those in groups with 80% or 100% of base fertilizer （N fertilizers）. These indicated that rational fertilization would maintain rapeseed yield high and reduce N input to improv
温室盆栽试验条件下,设置渍水和对照2个水分处理,每个水分处理下设置3个施氮水平(0.05、0.2、0.3 g N·kg^(-1)土),研究了花后渍水逆境下氮素营养对两个氮高效基因型‘Monty’、‘湘油15’和两个氮低效基因型‘R210’、‘Bin270’油菜产量、产量性能及氮肥利用效率的影响.结果表明:与对照相比,花后渍水处理显著降低了油菜的单株角果数、千粒重、每角粒数和籽粒产量.在适宜水分条件下,增施氮肥显著增加了油菜籽粒产量,而在渍水逆境处理下,增施氮肥对油菜籽粒产量的形成贡献不大.氮高效基因型较氮低效基因型对花后渍水逆境下的籽粒灌浆充实具有一定的促进作用.在同一水分处理下,花后渍水明显降低了油菜氮肥利用率、氮肥偏生产力、氮肥农学利用率、氮素吸收效率和氮收获指数,渍水显著影响了不同基因型油菜的氮素吸收利用能力,而氮高效基因型在渍水逆境下较氮低效基因型更有利于将氮素转运、再分配到角果中,提高籽粒生产效率.油菜产量性能参数存在显著的水氮互作效应,水分、氮肥及水氮互作对油菜籽粒产量和产量性能参数的影响因基因型的不同而异.
