新辟山地桃园化学除草试验

对适宜新辟桃园的除草剂品种进行了比较，筛选并研究了合理的混用技术。在所选的５ 种药剂中，克芜踪的速效性最好，但持效期短。用２０％ 克芜踪３ ０００ｍ ｌ／ｈｍ ２ 喷施，药后１０天，杂草平均株防效和鲜重防效达９１．１％ 和９６．２％ ；药后１５ 天，杂草开始复生，防效下降；药后６０ 天株防效和鲜重防效降至３５．４％ 和６７．７％ 。草甘膦系列的除草净度高、防效持久，但药效发挥较缓慢。用４１％ 农达５ ２５０ｍ ｌ／ｈｍ ２，药后２０ 天株防效和鲜重防效达９０．７％ 和９３．１％ ；药后６０ 天株防效和鲜重防效仍达９４．０％ 和９３．７％ 。克芜踪、草甘膦系列除草剂与禾耐斯（乙草胺）混配，能互补长短，提高药效。混用后，克芜踪防效提高２％ ～８％ ；农达、草甘膦防效提高２％ ～５％ 。人工锄草株防效和鲜重防效仅为７０．６％ 和８４．１％ ，且山地表土层松动后易造成水肥流失。

The Experiment in Weedicide in New Peach Orchard in Upland

The Several weedicides and their using tachniques of mixed weedicides were compared in this experiment. Among five weedicides,the effect of paraquat had the fastest but short peirod of chemical effectivety.3000ml/hm 220% paraquat sprayed,10 days late,the average effect on weed′s plant and fresh weight were 91.1% and 96.2% respectively;15 days late,the weeds began growing again and the effect of weedicide was reducing ;60 days late,the effect on weed′s plant and fresh weight reduced to 35.4% and 67.7% respectively. The series of Glyphosate produced effect slowly,but the effect was better and lasted longer time.The effect of glyphosate (a kimd of glyphosate)was the best one. 5 250 ml/hm 2 41% glyphosate sprayd, 20 days late,the effect on weed′s plant and fresh weight were 90.7% and 93.1% respectively;60 days late,the effect were still 94.0% and 93.7% respectively. Mixture solulion of paraquat, a series of glyphosate and acetochlor could improve the effect on weed's control.Then,the effect of paraquat improved 2%～8%;glyphosate,2%～5%.The effect of manual weeding for weed′s plant and weight were 70.6% and 84.1% respectively,but the manual weeding made surface soil be loose resulting in the fertilizer lose easily.