拔节孕穗期控水对旱稻80农艺性状及产量的影响

Effects of Water Control on Agronomic Traits and Yield of Handao 80 in Jointing-Booting Stage

为探讨旱稻在拔节孕穗期对水分胁迫的响应,以旱稻80为试验材料,通过盆栽方式,研究了拔节孕穗期不同土壤水分处理对旱稻农艺性状及产量的影响。结果表明:土壤水分控制<T5(土壤相对含水量95%~100%)时,随着水分的减少,旱稻80株高、茎蘖数、叶面积及单株干重降低,有效穗数和结实率变化较小,穗粒数和千粒重降低,尤其是穗粒数降低幅度最大,进而导致产量显著降低,因此,旱稻拔节孕穗期的土壤相对含水量应保持在95%以上,否则将会影响旱稻最终产量。

In order to investigate the response of upland rice to moisture stress at jointing and booting stage,Handao 80 was used as experimental materials to study the effects of different soil moisture treatments on the agronomic traits and yield of upland rice through pot experiments at the jointing-booting stage.The results showed that when the soil moisture control less than treatment 5(soil relative moisture content 95%-100%),the plant height,tiller number,leaf area and dry matter weight were decreased with the moisture decreased.At the same time,the effective panicle number and seed setting rate were changed little,but 1000-grain weight especially grain number per panicle were decreased,respectively,resulting in a significant decline in upland rice yield.During jointing-booting stage,the soil relative moisture content must be more than 95%,otherwise the yield of upland rice will be decreased significantly.