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Effects of Monosulfuron on Growth of Millet and Soil Microbial Function

LI Yong-hong1,GAO Yu-bao2(1.College of Chemistry,Nankai University,Tianjin 300071,China;2.College of life Science,Nankai University,Tianjin 300071,China)  
The effects of monosulfuron, a novel sulfonylurea herbicide invent ed by Nankai University, on growth of four cultivars of millet, the biochemical pr operties and microbial quantities of soil were investigated in a greenhouse. Mon osulfuron was incorporated at 25, 50, 100, 200, 400 and 800 靏穔g-1( i. e., e quivalent to the recommended field dose, 2-fold, 4-fold, 8-fold, 16-fold and 32-fold higher concentrations). In the treatments of 25 and 50 靏穔g-1, a s lightly adverse effect on plant growth was observed only in the early stage of t he experiment (8 days), and the growth of plants were similar to or better than control in later stage (22 days) of the experiment. Cultivars 98481 and an 4004 were considered as the most insensitive and most sensitive cultivar, respectivel y. Numbers of fungi and actinomycete in soil containing monosulfuron increased t han control 90 days after the treatment. Slight changes of urease and invertase activities of soil containing the herbicide were also observed. Decrease in the dehydrogenase activity and increase in cellulose decomposition activity, in comp arison with the untreated soil control, were found at all doses of monosulfuron as the effects showed correlativity with the dosage of monosulfuron.
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