优质米品种双竹粘的产量生理及其调控指标的研究

STUDIES ON THE YIELD PHYSIOLOGY AND REGULATION INDEX OF FINE QUALITY RICE VARIETY“SHUANG-ZHU-ZHAN”

本文研究了双竹粘在杂优栽培法(稀播、少苗、大穗)下的产量生理及调控指标.

Rice cv.of fine grain quality“Shuang-Zhu-Zhan”was studied and the main resultsobtained as follows:The yield of“Shuang-Zhu-Zhan”could be increased significantly in the pattern ofhybrid rice culture.“Shuang-Zhu-Zhan”belongs in a sink-limited variety,therefore,the yield increasecan be obtained through raising the number of total spikelets per mu,but the increase of to-tal spikelets per mu were only depended on the increase of the number of spikelets perpanicle.To obtain larger panicles and increase the number of filled spikelets per panicle,thefertilizer application should be changed into the mode:a controlled application at the til-lering stage,a heavy application at the initiation stage,and with supplementary at the boot-ing stage and heading stage.There existed a positive correlation between the yield and the total dry weight.Thosewith fewer panicles and heavier dry matter of single tillers showed higher yield and harvestindex in the case of total dry weight being approximate.In order to increase the biologicalyield,the emphasis should be put on the enhancement of single tiller weight.Cultural practice on rice quality performed significant effects.