水稻苗期不同喷淋间隔处理对其生长发育及产量的影响

为探明旱育秧模式下苗期水分管理方式对水稻生长及产量的影响,以辽粳401为供试材料,选用2种育苗载体（基质和营养土）,设置3种喷淋间隔（24、48和72h）,研究秧苗素质、大田生长发育及产量的变化规律。结果表明,喷淋间隔由24h延长至72h,秧苗株高降低,根数增多,根冠比增大,秧苗综合素质提高。喷淋间隔72h秧苗机插后分蘖发生早,分蘖数量多,生育时期提前。在拔节期、齐穗期和成熟期,喷淋间隔72h处理的叶面积指数较高,干物质积累量较多;喷淋间隔72h处理成熟期有效穗数增加,结实率提高,实际产量最高。

Effects of Water Spraying Interval at Seedling Stage on Growth and Yield of Rice

We used Liaojing 401 as the material and two substance treatments (organic substrate and nutrient soil) and three water spray cycles treatments (24, 48 and 72h) to examine the impacts of water management for dry seedbed at seedling stage on growth and yield of rice. The seedling quality, growth and development in field and yield were studied. The results showed that the seedling plant height when the spray interval increased from 24h to 72h, the roots number and ratio of root to shoot increased, and the overall quality of the seedlings was enhanced. Rice seedlings of 72h spraying interval entered tiller stage quickly and gain more tillers, the main growth stages ware advanced. The leaf area index and dry matter accumulation of the rice with 72h spraying interval were high at the stages of jointing, heading and maturity. The productive panicle number and seed-setting rate increased at maturity stage, and the yield was the highest with 72h spraying interval.