两种除草剂对五节芒的防除试验

采用2种化学除草剂(41％草甘膦异丙胺盐水剂、5％森泰颗粒剂)6个剂量水平,分别对五节芒Miscanthus floridulus (Lab.) Warb.ex Schum.et Laut.]施药1次、2次和3次,分析防除效果及防治成本.结果表明,两种除草剂均显著提高麻栎(Quercus acutissima Carruth.)幼苗存活率,草甘膦处理麻栎幼苗存活率比森泰处理高24.7％.草甘膦6 L/hm2和森泰25 g/丛经过3次施药、草甘膦7.5 L/hm2和森泰30 g/丛通过2次或3次施药,防治效果均可达到85％以上;而各剂量水平只进行1次施药,防治效果不佳.在防治效果85％以上的处理中,草甘膦防治成本略低于森泰颗粒.

Chemical control of Miscanthus floridulus with Glyphosate and Hexazinone

Control effectiveness and cost analysis of 6 dose levels of two herbicides (41% isopropylamine salt of Glyphosate, 5% Hexazinone granules) with different apply times on Miscanthus floridulus were studied. The results showed that the survival rates of Quercus acutissima seedling were significantly improved with using herbicides, and the survival rate of Glyphosate treatments were higher than that of Hexazinone treatments by 24.7%. The control effect above 85% when we applied Glyphosate with 6 L/hm2 and Hexazinone with 25 g/bunch, applied twice or thrice Glyphosate with 7.5 L/hm2 and Hexazinone with 30 g/bunch twice or thrice. However, treatments of appling herbicides once had poor control effect. The cost of Glyphosate treatments was slight less than that of Hexazinone in treatments which had control effect above 85%.