Effects of different doses of bensulfuron-methyl·butachlor and quinclorac on the growing environment and nutrient accumulation of Chinese milk vetch

doi:10.11686/cyxb20140523

Abstract

Abstract:

A pot-culture experiment was conducted to study the effects of different doses of bensulfuron-methyl·butachlor and quinclorac on red paddy soil environment and growth of Chinese milk vetch (Astragalus sinicus) plants. Applying bensulfuron-methyl·butachlor and quinclorac in paddy soil decreased the dry matter weight of Chinese milk vetch by 13.1%-52.8%, and the more doses applied the more dry matter decreased. The lower dose of bensulfuron-methyl·butachlor applied in paddy soil significantly decreased N accumulation by 10.6%, while the quinclorac decreased the N and K accumulation in milk vetch plants by 15.0% and 15.2% respectively. The higher doses of bensulfuron-methyl·butachlor and quinclorac decreased the N, P and K accumulation in milk vetch plant by 32.7%-37.9% and 49.6%-56.6%. Applying with either a lower or a higher dose of both bensulfuron-methyl·butachlor and quinclorac decreased the availability of soil N and K by 9.2%-28.7% and 11.4%-29.6%. A higher dose of bensulfuron-methyl·butachlor and quinclorac, remarkably, decreased the available P content in soil by 5.4% and 6.1% respectively. Furthermore, applying a lower dose of bensulfuron-methyl·butachlor did not have noticeable influence on the activity of catalase, sucrase and urease in soil, while the activity of catalase was markedly restricted by applying a lower dose of quinclorac. The activity of sucrase was not significantly changed even at a higher dose of bensulfuron-methyl·butachlor and quinclorac which greatly restricted the activity of catalase and urease. Furthermore, applying a lower or higher dose of bensulfuron-methyl·butachlor increased the amount of bacteria, and an adverse effect of quinclorac was observed. The amount of actinomyces decreased by applying a lower or higher dose of bensulfuron-methyl·butachlor and quinclorac, though the incidence of fungi was not changed remarkably. To sum up, in order to meet the requirement of nutrients for growth of Chinese milk vetch, it is necessary to supply additional N or N and K nutrients to soil when applying a lower dose (i.e. the recommended dose in paddy soil) of bensulfuron-methyl·butachlor or quinclorac respectively, while additional N, P and K nutrients should be added to soil when applying a higher dose of bensulfuron-methyl·butachlor and quinclorac in paddy fields.

CLC Number:

S482.4

XIE Zhi-jian,XU Chang-xu,LIU Guang-rong,CAO Wei-dong. Effects of different doses of bensulfuron-methyl·butachlor and quinclorac on the growing environment and nutrient accumulation of Chinese milk vetch[J]. Acta Prataculturae Sinica, 2014, 23(5): 201-207.

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