不同生育期喷施“多效好”对水稻的增产效应

EFFECTS OF SPRAYING“DUOXIAOHAO”IN DIFFERENT GROWTH STAGES ON RICE YIELD

1987年早造和1989年晚造分别在水稻分蘖期、幼穗分化期、孕穗期,始穗期、灌浆初期进行喷施“多效好”试验.结果表明,不同生育期喷施“多效好”对水稻的根系生长、分蘖、绿叶面积扩大及叶绿素含量的增加均有促进效应.早期喷施明显增加生物产量,后期喷施提高经济系数.最后通过不同程度增加亩穗数、每穗实粒数和千粒重来提高产量.1987年每亩增产稻谷20.0～39.5kg。增产4.1%～8.0%;1989年每亩增产稻谷24.0～40.2kg,增产6.2%～10.4%.增产幅度最大的是孕穗期喷施,其次为分蘖期喷施.

The expcriment of spraying“Duoxiaohao”in stoling,young panielc differentiation,spike formation stages and carly filling pcriod was carried out in the carly scason of 1987 and the lale scason of 1989.The rcsults showcd that“Duoxiaohao”has rcmarkable cffects on rice growth and yield.Comparcd with thc control,yield incrcased by 20.0～39.5 kg per mu or 4.1%～8.0%in the expcrimcnt or 1987.In the experimcnt carricd out in 1989,the yicld increased by 24.0～40.2 kg per mu or 6.2%～10.4%.Spraying in spikc formation stagc gave the highest yield and the stooling stagc was the sceond.