双季杂交稻高产技术经验分析

Analysis on High Yielding Technical Experiences of Double-cropping Hybrid Rice

作者总结各地高产经验认为，穗数和粒数是杂交水稻高产的关键。为了增穗增粒必须培育带大蘖的壮秧，使本田前期分蘖早发，以建立中、后期的合理群体结构和良好的冠层结构。品种搭配上双杂能显著高产，应突破杂交早稻。

To increase rice production in Zhejian province with an arable area of merely about 330m2 per caput,the only way is to raise the rice yield per unit area. The results of analysis on the high yielding experi- ences showed that the number of panicles (NP) and the number of spikelets (NS) are the most important con- tributors to yield among the yielding components in hybrid rice;In the cropping system,double-cropping hy- brid rice can increase yield conspicuously;In order to increase NP and NS,the cultural management should be favourable for raising vigorous seedling with big tillers,promoting the early growth of seedling in the field,es- tablishing good population structure and canopy structure;To obtain high yield of the whole year,the pairing of hybrid rice combinations in double-cropping system should be based on their effective accumulated tem- perature (EAT) and be advantageous to breaking through the yield of early rice and stablizing that of late rice.