The Study Of Several Herbicidal Mixture In Cornfield

With the research and exploiture, herbicides' mixing has became the important measure of integrated weed management systems. It is also an important way of improving the application of herbicides. The mixture of chemical herbicides, an effective and vital technical means of killing the field weeds, has the advantages of killing more kinds of weeds, improving the effect of the herbicides, decreasing the cost of the production, prolonging the herbicide spreading time limit, as well as weaking the resistance of the weeds against herbicides.Dish-dipping and pot-spraying methods were conducted to evaluate the action of combinations of nicosulfuron+2,4-D butylate, nicosulfuron+atrazine, nicosulfuron+pendimethalin, nicosulfuron+ metribuzine, 2,4-D butylate+metribuzine, atrazine+diuron. On the basis, this paper further discussed the weed control spectrum of nicosulfuron, 2,4-D butylate and atrazine by potted experiment; the action of combinations of nicosulfuron+2,4-D butylate, nicosulfuron+ atrazine were further studied through a field experiment; the wetting agent, dispersant and carrier screening of 50% nicosulfuron- atrazine wettable powder and 30% nicosulfuron- 2,4-D butylate wettable powder were researched. The experimental results are showed as follows:1. The results show that combining Nicosulfuron+Atrazine is additon in inhibiting Triticum aestivum bud, and slight synergism in killing Chenopodium. album and Setaria viridis; combing Nicosulfuron+2,4-D butylate is synergism in inhibiting Triticum aestivum bud , killing Chenopodium. album and Setaria viridis; combing nicosulfuron+ pendimethalin and nicosulfuron+ metribuzine is additon in inhibiting Triticum aestivum bud , killing Chenopodium. album and Setaria viridis; combing 2,4-D butylate+metribuzine is synergism in inhibiting Abutilon theophrasti bud, and additon in killing Chenopodium. album and Setaria viridis; combing atrazine+diuron is synergism in inhibiting Echinochloa crus-galli bud , killing Chenopodium. album and Setaria viridis. In conclusion, all of the combinations are not antagonism, they can be used according to practical demand.2. The weed control spectrum of nicosulfuron, 2,4-D butylate and atrazine are different. Nicosulfuron is susceptible to Echinochloa crus-galli, Setaria viridis, Amaranthus retroflexus and Polygonum lapathifolium, while it isn't susceptible to Eleusine indica, Abutilon theophrasti and Chenopodium album. 2,4-D butylate is susceptible to broadleaf weeds , while it can not control gramineous grasses. Atrazine is susceptible to Echinochloa crus-galli, Amaranthus retroflexus, Polygonum lapathifolium, Eleusine indica and Chenopodium album, while it isn't susceptible to Setaria viridis and Amaranthus retroflexus. Therefore, the mixture of nicosulfuron+2,4-D butylate, nicosulfuron+ atrazine can enlarge the range of weeds' control.3. Field experiment was conducted to further evaluate joint action and the safety to corn of nicosulfuron+2,4-D butylate, nicosulfuron+ atrazine. The results show that combining these two herbicides produced synergistic effect. When 4% nicosulfuron SC 50ml/667m~2+72%2,4-D butylate EC 20ml/667m~2, 4% nicosulfuron SC 50ml/667m~2+38% atrazine SC 88 ml/667m~2 can control most of weed and also had well safety to com.