机油乳油提高药液对紫茎泽兰叶片润湿性研究

测定添加机油乳油的氨氯吡啶酸药液和甲嘧磺隆药液的表面张力,得到了机油乳油可以很明显地降低市售的氨氯吡啶酸、甲嘧磺隆制剂药液的表面张力的结论。氨氯吡啶酸的表面张力可由80mN/m左右降低到37mN/m左右,甲嘧磺隆可从90mN/m左右降低到40mN/m左右。通过氨氯吡啶酸药液和甲嘧磺隆药液与紫茎泽兰叶片接触角随时间变化规律的研究,确定液滴与叶片达到平衡的时间,即接触角测定的最佳时间。在药液与叶片达到平衡时,测定添加不同浓度机油乳油的氨氯吡啶酸药液与甲嘧磺隆药液与紫茎泽兰叶片的接触角,找出接触角较小时机油乳油的最低浓度,探索出提高药液在紫茎泽兰叶片润湿性的最小机油乳油添加浓度,以期为野外紫茎泽兰的化学防除工作提供参考。结果表明,液滴与紫茎泽兰叶片平衡时间为50s;农药与助剂最佳搭配为:0.2～0.4g/L氨氯吡啶酸+0.020%～0.040%机油乳油,0.4～0.8g/L氨氯吡啶酸+0.004%～0.040%机油乳油,0.8～1.6g/L氨氯吡啶酸+0.004%机油乳油;0.1～0.2g/L甲嘧磺隆+0.020%机油乳油,0.2～0.4g/L甲嘧磺隆+0.020%～0.040%机油乳油、0.4～0.8g/L甲嘧磺隆0.020%～0.040%机油乳油。

Study on Enhancement of Wetting Property of Herbicide on Eupatorium adenophorum Spreng Leaves by Petroleum Oil

The surface tensions of the picloram solution and sulfometureon-methyl solution contained different concentrations petroleum oil were determined. The results proved that the petroleum oil could obviously reduce the surface tension of the hebicides solution, namely, the surface tension of picloram solution could decreased to 37 mN/m from 80 mN/m and sulfometureon methyl solution could decreased to 40 mN/m from 90 mN/m. The contact angle's changes with time was studied that of picloram solution and sulfometureon methyl solution contained different concentrations petroleum oil on Eupatorium adenophorum Spreng leaves. So the time when the drop and the leaves reached a state of equilibrium, that was the proper time of determining contact angle, was ascertained. Further, the contact angles were measured at the time determined before, and we could find the added petroleum oil's minimum concentration which is enough to enhance the solution's wetting property on the leaves while the contact angle is less relatively. Hope the results could provide some assistance to control and eliminate Eupatorium adenophorum Spreng. The conclusions could be drawn that the equilibrium time was 50 s. The better ones of the groups contained the herbicide and the petroleum oil were followed as: 0.2 - 0.4 g/L picloram with 0.020 % - 0.040 % petroleum oil; 0.4 - 0.8 g/L picloram with 0.004% - 0.040% petroleum oil; 0.8 - 1.6 g/L picloram with 0.004% petroleum oil; 0.1 - 0.2 g/L sulfometureon methyl with 0.020% petroleum oil; 0.2 - 0.4 g/L sulfometureon methyl with 0.020% - 0.040% petroleum oil; 0.4 to 0.8 g/L sulfometureon methyl with 0.020% to 0.040% petroleum oil.