早籼良种叶型和产量的分析

ANALYSIS ON LEAF—TYPE AND YIELD OF EARLY IMPROVED INDICA RICE VARIETY

研究泸红早1号和泸早872两个早籼良种的叶型和产量因素。结果表明:功能叶的长、宽、面积的配置关系存在品种差异;高产早籼良种功能叶长/宽的大小顺序应为倒三叶>倒二叶>剑叶,比叶重以剑叶最大为宜。抽穗期剪叶会显著降低结实率;品种的产量水平越高,剪叶对结实率的影响就越小,源和库的协调性也越好。在产量因素的进一步改良上,应在泸早872的基础上着重提高穗数来提高产量。

Studies were made on the leaf--type and the yield components of two early improved indiea rice varieties, Lu Hong zao 1 and Lu Zao 872. As a result, it showed that the form of top throe leaves were different among varieties on leaf length, leaf width and leaf area. About leaf length/leaf width the top three leaves were arranged in order of the third leaf>the second leaf>the flag leaf. However, the last was the greatest on specific leaf weight. The rate of seed setting would be reduced significantly by cutting leaves during the heading period. The higher the yield level of the variety was, the less the effect on the rate of seed setting by cutting leaves, and the better the coordination between source and sink did. To make further improvement on the characters of grain yield, it was important to increase panicle number on the basis of the components of Lu zao 872.