尿素与3种酰胺类除草剂在稻田的混用效应研究

Study on Application Effect of Three Kinds of Herbicides Mixed with Urea

通过田间小区对比试验和盆栽试验研究了3种酰胺类除草剂丁草胺、乙草胺、异丙甲草胺单用及与尿素混用对除草剂药效、尿素肥效和水稻的产量性状的影响。结果表明,这3种酰胺类除草剂与尿素混用对稻田各类杂草的株防效、鲜重防效都略高于除草剂单用;对水稻的生长表现为“前控后促”的趋势,水稻收获时的各项经济性状指标都优于除草剂单用;,可以提高水稻的安全性和氮素的吸收利用率,且在一定程度上延缓尿素在土壤中的释放及延长农药的持效期。

The application effect of three herbicides（butachlor,metolachlor and acetochlor） mixed with urea on the fertilizer efficiency, the utilization ratio of urea, the security and rice yield was studied through plotted experiment and small areas as well as laboratory analysis, respectively. The result showed that three kinds of herbicides combined with urea in the plotted experiment might be excellent for the weeds control, During the rice-growing period,the total weed-killing percentage was stable over 85% and 90% in fresh weight,The mixtures could inhibit above-growth in seedling stage and stimulate rice growth during adult addition; all agricultural properties of the rice were higher obviously while reaping and the rice yield was increased to 13,9% ,11.4% and 10.5%, separately.The utilization ratio of urea was increased to 3.2%,6.2% and 2,2% ,Further more the herbicides mixed with urea delayed the release time of urea in soil and the residual effects period of herbicides was more than 50 days.