双季抛栽稻的生育特性研究

对抛栽稻和手插稻的比较试验表明：（１） 抛栽稻的生育优势有：分蘖早，分蘖多，有效穗多；根系生长好，吸肥能力强；早稻抽穗期叶面积系数大，生物产量高。晚稻在施用穗肥的条件下也有同样的优势。（２） 抛栽稻的生育劣势有：无效分蘖多，成穗率低；高效叶面积率低，每穗粒数少；茎鞘运转率和经济系数低；抗根倒能力差。（３） 抛栽稻高产的主攻方向是提高成穗率和增加每穗粒数

Study on the Growth and Developmental Characteristics of Double-Cropping Rice by Seedling-Throwing Culture

Comparison test of seedling -throwing culture(STC) and hand-transplanting culture(HTC) in rice showed that:(1)Growth and developmental superiorities of rice by STC were:earlier emergence of tiller,more tiller and effective panicles;better root growth and stronger capability of absorbing fertilizer;larger LAI at heading stage and higher biomass in early and late rice when fertilizer was applied in the period of ear of late rice.(2)Growth and developmental inferiority of rice by STC were:more ineffective tiller,lower percentage of earbearing tiller;lower percentage of high effective leaf area,less grains per panicle;lower translocation rate of stem and sheath and harvest index;weaker resistance to root lodging.(3)High yielding emphases in rice by STC were increasing percentage of earbearing tiller and grains per panicle.