施氮和密度对寒地水稻分蘖状况及产量的影响

为探明寒地水稻肥密因子对水稻分蘖及产量的影响,采用多元二次旋转回归正交组合方法,研究粳稻'垦鉴稻10号'在不同时期的施氮量、调节肥施用时期及穴距对其分蘖及产量的影响.结果表明:对分蘖状况影响最大的因子是前期氮肥用量,其次是穴距和调节肥施用时期,再者是前期用氮量与其他因子的互作;与此同时,对分蘖状况各因子与产量的相关分析表明,有效蘖率＞蘖穗率＞最高蘖数＞有效蘖率与群体成穗率互作＞最高茎数与群体成穗率互作.因此,根据生产实际,尤其在低温地凉年份,适当加大前期氮肥用量并配合适当的密度以及其他农艺措施促使分蘖早生快发是提高寒地水稻产量的有效途径.

Effects of N-fertilizer application and density on tiller and yield of rice in cold area

To investigate the effect of fertilization factors and density on rice tiller and yield in cold area,the effect of N-fertilizer dosage at different stages,application stage of regulating fertilizer(RF) and hole spacing(HS) on rice yield,yield components and tiller was discussed by using the method of multiple factors quadratic rotation-regression-orthogonal combination design.The conventional japonica rice variety 'Kenjiandao 10' was used as test material.The results showed that the amount of N-fertilizer i...