Effect Comparison Of Different Herbicides On Weed Control In Eucalyptus Forest

In recent years,with the rapid development of Eucalyptus in Guangxi,the afforestation area is not short and expanded.The control of weeds under Eucalyptus forest has become an important task of forest management.The use of chemical herbicides in forestry has the advantages of good weeding effect,strong sustainability and labor saving,but the impact of chemical herbicides on the growth of forest stands and other negative effects have been a problem for forestry workers.In this study,how to choose a safe,effective and economic herbicide to carry out a comparative test.In this paper,six kinds of herbicides were selected to carry out simulation test under Eucalyptus forest according to the dosage recommended by the manufacturer in paiyangshan forest farm.The weeding effect of six kinds of herbicides was compared,and the pot experiment was carried out to compare the safety of six kinds of herbicides on eucalyptus seedlings.On this basis,select a herbicide with good weeding effect and high safety,and further carry out a large-area spraying comparative weeding effect test in combination with the actualforestry production,and study the weed control effect of various herbicides,the impact on the growth of Eucalyptus and the analysis of production cost1.The single use simulation test of glyphosate,glyphosate,cyclozinone,2,4-D,dicamba and atrazine in Eucalyptus forest showed that the highest control effect of cyclozinone was 95.8%,and that of xiudejin was the lowest,only 82%.The weeding effects of the six herbicides were: cyclozinone > glyphosate > glyphosate > 2,4-D >dicamba > atrazine.Although the effect of cyclozinone is the best,the rate of weeding is slightly slower than glyphosate.The six herbicides are harmful to eucalyptus seedlings,and glyphosate and glyphosate are safe.Combined with weeding effect,weeding efficiency and safety,glyphosate was selected for further study in combination with production practice.2.Four kinds of herbicides containing glyphosate(45% glyphosate,41% glyphosate isopropylamine salt,32% acetochlor,32% oxalate)were selected.The results showed that the control effect of large-area spraying was 45% acetochlor > 41% glyphosate isopropylamine salt > 32%acetochlor > 32% oxalate,and two months later The control effect was:32% acetochlor > 41% glyphosate isopropylamine salt > 45%acetochlor > 32% acetochlor.3.There was no significant effect on the growth of Eucalyptus DBH and height by 45% Cao Yishu,41% glyphosate isopropylamine,32% CaoYishu and 32% Cao Shu.4.The cost per mu of 45% glyphosate,41% glyphosate and isopropylamine salt,32% glyphosate and 32% kelshu for weed control is:41% glyphosate and isopropylamine salt 51.4 yuan / mu < 32% kelshu52.2 yuan / mu < 32% kelyishu 52.4 yuan / mu < 45% kelyishu 55.9 yuan/ mu.Based on the above results,32% acetochlor had the best control effect,but the cost was a little higher.