【摘要】 夏播"京早7号"玉米叶片、叶鞘及节间的干物质积累与输出动态是多峰曲线,雄穗、苞叶、花丝为单峰曲线。总干物质增长的关键时期是雄穗四分体到乳熟始期,各生育期间干物质积累的主要器官,抽雄前为叶片、叶鞘;抽雄至乳熟始期为节间;乳熟始期到成熟是籽粒。各器官及其不同叶位器官间及与产量有明显的物质关系,支配它们之间关系的主导因素是叶片。试验结果为叶片分组提供了相应的依据。更多还原

【Abstract】 The results studied in 1979 and 1980 had showed that,the aecumulative and exportative trends of dry matter in leaf blade,leaf sheath and internode appeared as poly-peaked curves whereas that in tassel,bracteal leaves and filaments appeared as mono-peaked curves.The key period of total dry matter aceumlation was from the tetrad stage of staminate flowers to early milk stage.The dry matter was mostly accumulated in leaf blades and leaf sheathes before heading stage,in intcrnodes beween the heading stage and early milk stage.and in grains then.There were evident substance relationships between different organs and between the organs and the yields.In these relationships,the leaves played a main role.This result provided a new evidence for dividing the whole leaves into three groups.更多还原