播期对水稻粒位间籽粒灌浆动态的影响

目的]为北方水稻良种的选育和高产优质栽培提供理论与实践依据。方法]应用Logistic模型研究了播种期对稻米品质迥异的2个品种、不同粒位间籽粒灌浆特性的影响。结果j播期推迟1个月均对2个品种的籽粒灌浆特性有明显影响。品质较差的大穗型粳稻品种丰优2000的千粒重下降较为明显，但品质有所改善，主要表现在强势粒灌浆速度快，有效灌浆持续时间短，弱势粒启动较慢，有效灌浆时间延长，灌浆高峰期延后。品质较好的沈农265强势粒受播期影响不大，而中部二次粒和下部二次粒受显著影响。结论]播期对品质较差的品种改善较大，其中以垩白度和食味值最为显著。播种期不仅影响起始灌浆量、灌浆速率和有效灌浆时间等灌浆参数，而且还影响品种间、强弱势粒间的灌浆进程。

Effect of Sowing Date on Grain Filling Dynamic for Grains at Different Positions within A Panicle of Rice

Objective] The study aimed to provide the theoretical and practice basis for the breeding of good north rice variety and for its high-yield and good-quality cultivation.Method] The effect of sowing date on grain filling dynamic for grains at different positions within a panicle of 2 rice varieties with different quality were studied with Logistic growth model.Result] Postponing the sow date for 1 month had obvious effects on the grain filling characteristic of 2 varieties.The big spike type japonica rice...