黄腐酸对乙草胺生物活性及持效期的影响

Effects of fulvic acid on bioactivity and persistence of acetochlor

采用玉米根长法或芽长法研究了黄腐酸对乙草胺的生物活性、持效期和除草效果的影响。结果显示:乙草胺浓度和玉米根芽生长呈明显负线性关系,乙草胺浓度与根芽的线性方程为y1=0.098x1+9.449和y2=0.079x2+22.255,相关系数R1=-0.9916、R2=-0.9809;黄腐酸能够提高乙草胺的生物活性和除草效果,并延长乙草胺的持效期,添加0.25%～4.00%黄腐酸,乙草胺抑制玉米芽长和根长的活性分别提高7.12%～14.27%和6.32%～11.65%,其持效期延长0.46～12.17天;施药后28天,添加0.5%～2.0%的黄腐酸使乙草胺防除稗草的鲜重抑制率提高11.93%～16.88%。

The method of the root length or shoot length of maize root length of the activity of acetochlor was employed in studying the effects of fulvic acid （FA） on acetochlor bioactivity and persistence. The results indicated that the dosage of aeetochlor had significant negative linear correlation with the root length and shoot length of maize, the regression equation of root length was Y1= 0. 098x1 ＋ 9. 449, R1 = - 0. 9916, the regression equation of shoot length was Y2 = 0. 079x2 ＋ 22. 255, R2 = - 0. 9809. The bioactivity of acetochlor on the root length and shoot length of maize was respectively improved 7.12% - 14.27% and 6.32% - 11.65% , the persistence of acetochlor was prolonged 0.46 - 12.17 days by dosages 0.25% -4.00% of FA. 28 days after application, the fresh weight inhibition rate of acetochlor on barnyardgrass was improved 11.93% - 16.88% by dosages 0.5% - 2.0% of FA.