【摘要】 通过对主茎优势型品种的籽粒灌浆特性及不同栽培措施对其作用结果进行了分析。结果表明 ,大穗、多粒、主茎优势型品种籽粒干重增加的关键时期是小麦灌浆的快增期。提高灌浆渐增后期至快增前期的灌浆速率 ;稳定快增后期灌浆速率 ;促进缓增期的灌浆速率对于提高此类品种籽粒干重至关重要。在本试验条件下 ,大穗、多粒、主茎分蘖优势型品种有利于籽粒干重增长的最佳播期是 1 0月 4日 ,最佳播量是 375× 1 0 4粒 /hm2 ,最佳的施肥方式是底施氮肥 1 95kg/hm2 ,不追施氮肥 ,底施纯磷 (P2 O5 ) 1 2 0 0kg/hm2 ,底施纯钾 (K2 O)4 5 0kg/hm2 。更多还原

【Abstract】 The grain filling characteristics of winter wheat varieties with main stem superiority type and the effect of variant cultural practices on it were studied in this paper The results showed that increasing key period of the grain dry weight of varieties with big spike, multiple grain, main stem superiority type was the fast increasing stage of wheat filling Raising grain filling rate from the later gradually increasing stage to earlier fast increasing stage, stabilizing grain filling rate of later fast increasing stage and decreasing descending rate of dry weight during slow increasing stage were the most important to improve the dry weight of varieties The optimum sowing time was 4 October, the optimum sowing norm was 375×10 4 grain per hm 2, and the optimum fertilizer form was bottom application N 195 kg/hm 2, no further application N, bottom application P 2O 5 120.0 kg/hm 2,K 2O 45.0 kg/hm 2. These were beneficial to the increase of the grain dry weight of varieties with big spike, multiple grain, main stem superiority type under this experiment condition更多还原