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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.
Under greenhouse pot experiment, two waterlogging treatments were set up, and three nitrogen application levels (0.05, 0.2 and 0.3 g N · kg -1) were set for each water treatment. Effects of Nitrogen Nutrition on Yield, Yield Performance and Nitrogen Use Efficiency of Two Nitrogen High Efficiency Genotypes ’Monty’, ’Xiang You 15’ and Two Nitrogen Low Efficiency Genotypes ’R210’ and ’Bin270’ in Water Challenge. Results The results showed that compared with the control, the post-anthesis waterlogging significantly reduced the number of pods, the 1000-kernel weight, the number of grains per square, and the grain yield of rapeseed Under the condition of waterlogging stress, increasing nitrogen fertilizer had little contribution to the formation of rapeseed grain yield.Compared with nitrogen inefficient genotype, nitrogen efficient genotype had a certain promotion effect on grain filling under anthesis waterlogging stress.In the same water After treatment, the post-anthesis waterlogging significantly reduced the nitrogen use efficiency, nitrogen partial productivity, nitrogen use efficiency, nitrogen uptake efficiency and nitrogen harvest index, and waterlogging significantly affected the nitrogen absorption and utilization ability of different genotypes of rapeseed Nitrogen efficient genotypes Compared with nitrogen inefficient genotypes, water deficit genotypes were more conducive to the nitrogen transport, redistribution to the angle fruit and improve the grain production efficiency.Rape output performance parameters of significant rape-nitrogen interaction, water, nitrogen and water-nitrogen interaction The effects of rapeseed grain yield and yield performance parameters vary by genotype.