| HNPC-C9908 is a new sulfonylurea herbicide created by Hunan Research Institute of Chemical Industry, It is mainly used to control weeds of wheat field. To improve the effect of controlling weeds, develop the extension of controlling weeds and improve the security on crop, the paper studied the mixing technology of HNPC-C9908 and the mixture of HNPC-C9908·Prometryne . The results as follows:1. Bio-determine on the joint action of the mixture of HNPC-C9908 and nine herbicides has been tested in greenhouse in controlling Digitaria adscendens and so on. Of them, the joint action of the mixture made by HNPC-C9908 and Prometryne(1:5) is synergistic obviously when is used on Amaranthus retroflexus , Digitaria adscendens and Abutilon theophrasti Medicus.Their respective CTC is 183.39,166.34 and 147.23. 2. By assist agent screening test, the optimum proportion of HNPC-C9908 · Prometryne 72% WDG is educed as fllows: HNPC-C9908-12.0%, Prometryne—60%, Dispersant A10—10.0%, Wetting agent B6—5.0%, Collapsing agent C4-2.0%, Felting agent D1 — 1.0%, Fill carrier to 100% (The code name of A10, B6, C4 and D1 are the representation of assist agents) .3. The results of the safety test show that the formulation of HNPC-C9908 · Prometryne. 72% WDG is safety to one-leaf-stage wheat and three-leaf-stage wheat. .The results of the safety test to succeeding crops is as follws: When the dose ≥60g/ha,it restrains the growth of the cotton, and when the dose≤ 45g/ha,it is safe to the cotton; When the dose ≥45g/ha,it restrains the growth of the corn and soybean, and when the dose≤30g/ha,it is safe to the corn and soybean; When the dose ≥15g/ha,it restrains the growth of the rice and peanut, and when the dose ≤7.5g/ha,it is safe to the rice and peanut; When the dose ≥7.5g/ha,it restrains the growth of the cole, and when the dose ≤3.75g/ha,it is safe to the cole; When the dose ≥1.5g/ha,it restrains the growth of the cabbage, and when the dose ≤7.5g/ha,it is safe to the cabbage.4. The results of field experiments indicate that HNPC-C9908·Prometryne 72% WDG provides relatively good control of the weeds. When dose of the formulation is 450 g/ha or 600 g/ha, the respective effect is over 80 % or 90 %. |
