播期对不同类型粳稻品种产量构成因素的影响

STUDY ON EFFECTS OF SEEDING TIME ON YIELD COMPONENT OFDIFFERENT VARIETY-TYPES OF JAPONICA RICE

试验表明 ,播期对不同类型粳稻品种产量构成因素影响表现为 :首先是每穗结实粒数或结实率 ,其次是千粒重 ,再次是每穗颖花数 ,而穗数 /667m2 受影响甚小。就江苏淮北地区而言 。

Field expriments proved that the yield components of different variety-types of japonica rice were influenced by seeding time as follows:the first effect was grains/panicle or seed setting percentage, the second effect was 1 000-grain weight and the third effect was spikelets/panicle, but panicles/667 m+2 was almost not influenced by the seeding time. In Huaibei area, the medium-maturing medium japonica rice (MMJR) is the proper type to be disseminated.