保试达(GLA)防除香蕉园杂草的药效及其对杂草群落的动态影响

通过田间试验研究新型膦酸类除草剂保试达(dufosinate-ammonium,GLA)防除香蕉园杂草的药效、杀草谱、安全性以及杂草群落次生演替动态,共设保试达200,250,300g/666.7 m2,克芜踪250 g/666.7 m2,百速顿250g/66.7 m2和清水对照6个处理.结果表明,保试达防除香蕉园杂草的药效均比克芜踪、百速顿好,防效的差异达极显著水平;保试达对优势杂草小飞蓬[Gonyza canadensis(L.)Cronq]防效达到100%;各处理对香蕉主茎植株无任何药害.但对香蕉基部蘖芽伤害水平达3～4级;处理试验45 d后,克芜踪处理的杂草群落多样性的丰富度、均匀度、密度-类群等指数显著区别于3个浓度的保试达试验处理,各处理的群落问相似性指数差异十分显著.综合分析可得,保试达250～300g/66.7 m2对香蕉园恶性和抗性杂草有较好防效功能,对香蕉园杂草群落次生演替有显著抑制作用.

Weed Control Effect and Dynamic Effect of a New Herbicide Glufosinate Ammonium on Weed Community in Banana Plantations

Under field conditions, a new type of herbicide glufosinate ammonium(GLA) imported was applied to control weeds in banana plantations to evaluate its weed control efficacy, its safety, and its effect on succession of the weed communities. In the experiment 3 herbicides were spary with 6 treatments: the imported GLA at 200 g/mu (1/15 hm2 or 666.7 m2) , 250 g/mu and 300 g/mu; paraquat at 250 g/mu; home made GLA at 250 g/mu; and a water control (CK) . The imported GLA controlled weeds most effectively in the b...