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杂交稻秧田杂草种类多、密度高,直接影响秧苗生长和带来拔秧困难。1988年在汕优圭33、协优64的杂交稻秧田做了多效唑(Multi—Effect Tridzole属植物生长调节剂)除草试验。试验方法供试15％多效唑可湿性粉剂是上海联合化工厂产品。选择3块秧田,在同一块田里设喷多效唑与不喷药(对照)的大区对比试验。在播种后5～7天,每亩秧田用多效唑200克(商品量),兑水100公斤,放干秧板水后喷雾。喷后23～25天(移栽前),考查杂草密度和高度,秧苗单株分蘖数和苗高。
Hybrid rice seedling variety of weeds, high density, a direct impact on seedling growth and bring seedling difficult. In 1988, Shanyougui 33, Xieyou 64 hybrid rice seedling did paclobutrazol (Multi-Effect Tridzole genus plant growth regulator) weeding test. Test Method Test 15% Paclobutrazol wettable powder is Shanghai United Chemical Plant products. Select 3 seedlings, set in the same field spraying PP and non-spraying (control) of the regional comparative test. 5 to 7 days after sowing, paddy field per mu with paclobutrazol 200 grams (amount of goods), Duishui 100 kg, put dried seedlings water spray. 23 to 25 days after spraying (before transplanting), weed density and height were examined, and tiller number and seedling height per plant were measured.