播种期对周麦18号籽粒灌浆特性及产量构成的影响

2007~2008年度对不同播种期条件下的周麦18号籽粒灌浆特性及产量性状进行了研究。结果表明,播种期对周麦18号籽粒灌浆和粒重有显著影响,籽粒灌浆持续期T、最大灌浆速率出现时间Tmax、渐增期持续时间T1、缓增期持续时间T3均随着播种期推迟而降低;最大灌浆速率Rmax、平均灌浆速率R和快増期持续时间T2、快増期灌浆速率R2、缓增期灌浆速率R3则随着播种期推迟而先升高后降低。进一步的研究表明,影响周麦18号粒重的灌浆参数主要是平均灌浆速率R和最大灌浆速率Rmax,此外,不同阶段的灌浆速率和灌浆持续时间对粒重也有较大影响。通过对产量构成因素的影响分析,本试验条件下,于10月12~17日播种,有利于产量构成因素协调发展,获得较高产量。

Effects of Sowing Dates on Grain Filling Characteristics and Yield Components of Zhoumai 18

The effects of different sowing dates on the grain filling characteristics and yield traits of Zhoumai 18 were studied in 2007~2008.The results indicated that the sowing dates had significant influence on the grain filling and grain weight.The grain filling duration(T),the appearing time of the maximum grain filling rate(Tmax),the duration at the increasing stage(T1) and the duration at the slightly increasing stage(T3) all decreased,while the maximum grain filling rate(Rmax),the average grain filling rate(R),the duration(T2)and grain filling rate(R2) at the rapidly increasing stage and the grain filling rate at the slightly increasing stage(R3) all increased firstly and then decreased with the delay of sowing date.The further study indicated that the average grain filling rate(R) and the maximum grain filling rate(Rmax) were the main filling parameters affecting the grain weight,and the grain filling rate and duration at different stages were second.By analyzing the effects of sowing dates on yield components,it could be concluded that sowing from 12 to 17 in October could coordinate the components so as to obtain the higher yield under the experimental conditions.