Abstract: This experiment was carried by using 2,4-D butylate on a mixture sown grassland mixed with four perennial grasses during June,1999 at an alpine area in Gausu province in China.The main results are states as follow:(a)The optimum quantity of using that herbicide is 1650 g/hm² with a concentration of 75% to be more effective no more forb weeds.(b)The bighear quantity for using that herbicide for cultivation in 2250 g/hm².The results showed that there were 10 troublesome weed species effected the establishment of perennial grass,and the top three were Chenopodium glaucum,Elshotlzia calycocarpa,and Microula sikkimensis.Moreover,the chemical control of these weeds was evaluated.Results showed that 2,4-D butylate could control them effectively,the optimum dose was 1188 g/hm²,the maximum dose should not be more than 1 622 g/hm² to make sure the safety of perennial grass.

Key words: Alpine region, Perennial grass, Weed control, 2,4-D butylate

摘要： 研究高寒地区多年生禾草混播草地建植当年的杂草种类、危害程度及所用除草剂的最佳和最大剂量。结果表明,混播草地杂草有10种,均为阔叶型,杂草草情指数高(74.08),危害严重。采用高效低毒、具有较强选择性和内吸传导性的2,4-D丁酯进行防除,其最佳剂量(按有效成分)为1188g/hm²;最大剂量为1622g/hm²。

关键词: 高寒地区, 禾草混播草地, 杂草防除, 2,4-D丁酯