中粳稻分蘖穗率与苗质、秧苗密度和群体质量关系的研究

Relationship among Tiller Ear Rate,Seedling Quality, Seedling Density and Population Quality for Mid-ripe Keng Rice

研究了中粳稻不同分蘖穗率群体与秧苗素质、秧苗密度、茎蘖动态、齐穗期群体质量和稻谷产量的关系。试验结果表明：分蘖穗率与秧苗密度、大田穴苗数和最高茎蘖数呈显著负相关，与苗质、分蘖成穗率和齐穗期的比叶重、粒叶比等群体质量指标均呈显著正相关。提高大田分蘖穗率显著提高穗谷重、谷草比、经济系数和经济产量。在保持秧大田比一致的条件下，培育稀播壮秧，减少大田穴苗数，提高分蘖穗率，建立合理的群体结构，提高群体质量。

Relationship among tiller ear rate of mid-ripe keng rice,seedling quality,seedling density,culm and tiller dynamics,and population quality of full ear stage,and paddy yield were studied.It was observed the tiller ear rate was negatively correlated with field main culm seedling number per plant,seedling density,and the number of highest culm-tillers,but positively correlated with seedling quality,ear formation of tiller,specific leaf weight (mg/cm 2),grain-leaf area ratio (grain/cm 2) and population quality index at full ear stage.The increase of field tiller number could significantly increase paddy dry weight per ear,paddy-straw ratio,harvest index,total spikelets per m 2 and economic yield.