Influence Of Monosulfuron On Different Crops And Its Tencdency In Soil

With bioassay method, this experiment focused on sensitivity monosulfuron caused on different types of crops, and its characteristics including absorption, leaching and residue in soil, The experiment, completely done in the laboratories of Northeastern Agricultural University, was composed of following parts: cultivating in indoors nourishing vessel some maize, cabbages and cucumber in the soil poisoned by monosulfuron of different density, and nourishing liquid; with bioassay method, studying relationship between residual time and amount of monosulfuron in the soil; by means of simulate rain, finding depth of monosulfuron's vertical mobiity through water on surface soil; by means of fixed-temperature vibration and high-speed eccentricity, studying monosulfuron's absorption amount and absorption coefficient.By means of experiment and data statistics, the following could be concluded. Firstly, in sensitivity to monosulfuron, cabbages rank first, maize next and cucumber the last, and among three types of maize, Dongnong 856 ranks first, Dongnong 251 next, Dongnong 248 the last. Besides, monosulfuron with relatively low density could speed up growing-up Dongnong 251, Dongnong 248, cabbages and cucumber. Secondly, monosulfuron had a half life of 12.1 days in the black soil of Northeast. Thirdly, monosulfuron's depths of leaching and lengths of maize's root could be expressed in quadric equation, with 14cm, 21cm, 25cm as the depths of maximum density respectively in black soil, black calcium soil and dark brown soil, which was negative correlated with amount of clay in the soil by principal component analysis and stepwise procedure. Soil with high leaching capacity could eliminate degradation by drainage. Fourthly, the largest absorption amount was no higher than 15%, which in the same type of soil was negatively correlated with temperature, and positively correlated with amount of clay in soil.This study provides scientific support to proper use of monosulfuron, and estimation on its pollution to soil and its influence on crops followed due to long-time use.Candidate: Wang Zheng Major: PesticidesSuperviser: Prof. Ye Fei...