播期对淮北粳稻产量构成因素的影响

试验表明,播期对不同类型粳稻品种产量形成的影响表现为:首先受播期影响的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/hm2受影响甚小.即播期主要影响籽粒(库容)充实度.而对每公顷总颖花量(库容)影响较小.就淮北地区而言.宜推广应用中熟中粳品种.可以使用晚熟中粳品种.慎用早熟晚粳品种.不用中熟晚粳品种.

Effect of seeding time on yield component of japonica-type rice in Huaibei

Field experiments proved that the yield component of different variety of japonica-type rice (non-glutinous rice) were influenced by seeding time as follows ; the first effect which was influenced by seeding time was grains/panicle or seed serting percentage, the second effect was 1000-grain weight and the third effect was spikelets/panicle, but panicles/hm2 was almost not influenced by seeding time, i. e. the grade of filled grain(GFG) was influenced mainly and total spikelets per hm2(TSM) was almost not influenced by seeding time. In Huaibei area, medium-maturing medium japonica-type rice (MMJR) must be applyed and disseminated, late-maturing medium japonica-type rice(LMJR) can be used on some condi- tions, carly-maturing late japonica-type rice(ELJR) can be used with caution and medium-maturing late japonica-type rice (MLJR) cannot be used on any condition.