成都平原两熟制条件下机插秧播期研究（英文）

在成都平原稻麦两熟制条件下培育适龄机插壮秧是机插秧技术能否获得高产的关键本研究以超级稻II优602为试材,研究播种期对成都平原稻麦两熟区机插秧秧苗生长、机插质量、生育进程、产量的影响,从而探索成都平原机插秧技术的配套高产栽培技术。结果表明：成都平原稻麦两熟区机插秧适宜的播种期为4月10-15日,秧龄45~50 d,此阶段播种的机插秧产量最高延迟播种虽然有利于改善机插质量,提高成穗率,但也会导致群体生长滞后,成穗质量差,有效穗、着粒数、结实率、千粒重等产量构成因子下降,进而产量减少,若推迟15 d播种,减产幅度甚至超过10%。

Study on Sowing Date for Mechanicaltransplanting Rice under Wheat-Rice Cropping System in Chengdu Basin

Nurturing sturdy mechanical-transplanting seedlings is the key to achieve high yield using mechanical-transplanting technology under wheat-rice cropping conditions in Chengdu Basin. In this study, super hybrid rice II You 602 was adopted as experimental material, to investigate the effects of sowing date on seedling growth,transplanting quality, growth process and yield of mechanical-transplanting seedlings in wheat-rice cropping region of Chengdu Basin, thus exploring supporting high-yield cultivation techniques for mechanical-transplanting technology in Chengdu Basin, Results showed that the appropriate sowing date for mechanical transplanting in wheatrice cropping region of Chengdu Basin was April 10-15, and the appropriate seedling age was 45-50 d, which led to the highest yield of mechanical-transplanting seedlings. Although postponing sowing was conducive to improving transplanting quality and increasing the percentage of earbearing tillers, it would result in lagged group growth, poor spike quality and reduced effective number of panicles, grain number, seed-setting rate, 1 000-seed weight and other yield components, thus declining the yield. Yield reduction rate would be above 10% with sowing date postponed by 15 d.