秧龄对不同类型机插晚稻产量形成的影响

采用不同类型的晚稻品种为材料,观察不同移栽秧龄对机插晚稻秧苗素质、茎蘖动态以及产量的影响。结果表明,试验所选晚稻品种均能满足双季机插生育期要求,相同田间管理水平下粳稻机插分蘖能力较弱,有效穗数较少,产量较低。秧龄应控制在15 d左右,长秧龄秧苗不仅不利于机插,而且田间产量也较低。机插晚籼稻分蘖力较强,应加强水分管理,控制无效分蘖,提高子粒充实度;粳稻机插应培育壮秧,增加机插基本苗数。

Effects of Different Seedling Age on Yield Development of Different Genotype Late Rice under Machine-transplanted Cultivation

Two genotype late rice were selected as m aterials to survey effects of different seedling age on seedling quality, tillers dynamics and production of machine-transplanted late rice. The results showed that the late rice varieties all could reach the requirement of double season machine-transplanted cultivation in growth period. Under the same field management level,compared with the indica rice,the japonica rice had weaker tillering ability,less effective spike and lower yield. The seedling age of both late rice should be controlled within 15 days, for the longer seedling age not only unfavorable to machine-transplanted work,but also the field production was lower than the shorter. The indica late rice had stronger tillering ability than the japonica late rice,so the water management should be strengthened to control the ineffective tillers and increase grain-filling degree,on the contrary,the japonica late rice should be increased the basic seedlings in field and optimized water management to promote the tillering ability.