气温与日长对早籼稻植株及其种子的影响

在武汉地区春播和分期夏播早籼稻,发现在6月23日至7月12日四期夏播的较其春播的生殖生长期稍长,营养生长期稍短,全生期天数缩短20%左右;种子粒重增大;种子的营养成分和食用品质都有所改善。这些变化反映了温、光对早籼稻植株及其种子的生态功能。在双季稻区选用合适的早籼品种作双晚栽培,并用秋收种子作种用是可行的。

THE EFFECT OF TEMPERATURE AND DAYLENGTH ON THE PHASE OF DEVELOPMENT AND SEED QUALITY OF EARLY RICE

Early rice (Oryza sativum L. subsp indica) was sown at a series dates in springand summer under natural conditions in Wuhan. It was found that rice of four summersowings between June 23 and July 12 had slightly longer reproductive and shorter vege-tative growing phases them the spring sown rice. The tolal growing period of the ricesown on these four dates Was shortened by 20% as compared to spring-sown rice. It wasalso observed that the nutrition elements, seed sige and seed quality of the summer so-wings were also improved. This indicated that ecological factors such as temperatureand daylength have important effects on plant and seed development. The results sugge-sted that it is plausible to grow appropriate early rice cultivars in the second rice cro-pping period and harvest the seed for next years planting.