轻型栽培稻田杂草发生及其危害性研究

１９９５￣１９９７年通过对４种轻型栽培方式（麦田套稻，水直播，早育抛栽，盘育抛栽）和水育秧人工移栽稻田杂草种群调查及杂草发生与危害差异性试验，结果表明：５种种植方式对稻田主要杂草发生频度的影响不明显，但是对稻田主要杂草优势度及杂草发生量有明显差异。麦田套稻，水直播、旱抛栽、塑盘抛栽、水育秧人工移栽稻田杂草危害分别使水稻产量下降７０．６％、６３．５％，４９．５％，１６．２％。

Emergence and damage of weeds in paddy field of four lightculture methods

The investigation and field experiments on emergence and damage of weeds were carrid out in paddy fields of five cultural methods (Wet seedlings transplanted by man and four lightcultural methods-relay intercropped rice, direct sowing in paddy field, dry seedlings by throwing and plastic-disc seedlings transplanted by throwing) from 1995 to 1997. The results indicated that the frequences of major weeds in paddy fields of five cultural methods had unmarked difference, but the dominances of major weeds, their emerged number and the full emerg period of weeds produced marked difference. The damage of weeds in relay intercropped rice, direct sowing in paddy, dry seedlings transplanted by throwing, plastic-disc seedlings by throwing and wet seedlings transplanted by man reduced the rice yield by 70.6%, 63.5%, 49.5%, 47% and 16.2% respectively.