4种助剂对异丙隆防除菵草的增效作用

为了比较4种助剂Silwet 806、红太阳A8、激健、安融乐对异丙隆防除菵草Beckmannia syzigachne的增效作用及机制,采用整株生物测定法测定4种助剂与异丙隆混用后对菵草的生物活性及对小麦的安全性;采用仪器分析法测定4种助剂对异丙隆药液的表面张力、叶面接触角、干燥时间和在叶面上的沉积量的影响.结果 表...

Synergism of four adjuvants to isoproturon in controlling Beckmannia syzigachne

To compare the synergism and mechanism of isoproturon mixed with four adjuvants (Silwet 806, Red sun A8, Jijian, Anngro) in controlling Beckmannia syzigachne, the bioactivity of isoproturon against B.syzigachne and wheat safety were determined by whole plant bioassay. The instrumental method was used to determine the influence of these mixed solutions on surface contact angle, drying time and deposition on leaf surface. The results showed that the ED90 values of isoproturon in controlling B.syzigachne were reduced to 553.11, 626.31, 819.93, 841.54 g/hm2,respectively, when four adjuvants added. But isoproturon mixed with Silwet 806 reduced the safety to wheat. The surface tension of the isoproturon solutions and the contact angle on the leaf surface after adding these adjuvants were significantly reduced and the drying time of the solution on the leaf surface was shortened, and the deposition amount of the solution on the leaf surface was significantly increased. The physical traits of Red sun A8 were significantly better than those of Jijian and Anngro, and therefore it can satisfy the purpose of decreasing dosage and increasing efficacy of isoproturon.