播种期对各生育时期甜高梁叶片性状的影响

对甜高梁品种辽饲杂3号在4个播种期条件下进行了叶片性状指标测定试验，分析了不同播种期甜高粱在拔节、孕穗、开花、灌浆期叶绿素含量、比叶重、叶面积指数及成熟期绿叶数等叶部性状变化规律。结果表明，叶片叶绿素含量在孕穗期与开花期达最大值，早播时甜高粱前期叶绿素含量高，晚播时后期叶绿素含量较高。比叶重在灌浆期达最大值，且以晚播甜高粱的比叶重较大。叶面积指数随播种期延迟，并有下降趋势，但晚播甜高粱在成熟期时叶面积指数较高。绿叶数的变化趋势类似于叶面积指数。

Effects of Sowing Time on Leaf Characteristics of Sweet Sorghum at Different Growth Stages

Four sowing dates were carried out for sweet sorghum Liaosiza 3, to determine the changes of chlorophyll content, specific leaf weight, leaf area index at elongation, booting, flowering, grain filling stage, and green leaves number at maturity stage were analyzed. The results showed that the chlorophyll content reached highest during booting and flowering stages. Early planting leaded to higher chlorophyll content in early stages, while late planting resulted in higher value at late stages. Specific leaf weight was highest at grain filling stage, and late planting sorghum had higher value. Leaf area index had a trend of decreasing with late sowing, but at maturity the leaf area index was highest for the late sowing sorghum. Similar results were observed for green leaves number at maturity and leaf area index.