【摘要】 为探究不同直播方式对晚稻生长特性及产量形成的影响,以杂交稻五丰优T025和常规稻黄华占为试验材料,比较湿润直播和旱直播水稻秧苗素质、出苗率、茎蘖动态、干物质积累总量和产量及其构成的差异。结果表明,与旱直播相比,湿润直播提高水稻产量,增幅达6.4%～24.1%,其中五丰优T025差异达显著水平,产量提高主要与有效穗数显著增加有关。从生长发育特性来看,湿润直播有利于增加秧苗株高,维持较好的秧苗素质;同时,还有利于提高植株茎蘖成穗、生育中后期叶面积指数与植株干物质积累量,为水稻增产奠定了基础。总体来说,在南方双季稻区采用湿润直播方式有利于晚稻生长发育及提高产量。更多还原

【Abstract】 The purpose of our study was to explore the effects of different direct seeding methods on growth and development characteristics and grain yield of late-rice. A hybrid rice variety Wufengyou T025 and an inbred rice variety Huanghuazhan were selected as testing materials. The difference of seedling quality, seedling emergence rate, tiller dynamics, total dry matter accumulation, grain yield and its composition were determined under both wet direct seeding and dry direct seeding methods. The results showed that wet direct seeding increased grain yield by 6.4%-24.1%, and Wufengyou T025 was significantly different compared with dry direct seeding. The grain yield increased was mainly associated with the significant increase in the number of panicles. From the point of growth and development characteristics, wet direct seeding was beneficial to increase seedling height and maintain better seedling quality. Wet direct seeding also helped to increase LAI and the amount of dry matter accumulation at the middle and late stages of plant growth and provided a foundation for rice yield increase. Therefore, it could be suggested that wet direct seeding was beneficial to late-rice growth and development and grain yield.更多还原