Joint effects of acetochlor and urea on germinating characteristics of crop seeds  

作　　者：Lena Q. Ma 

机构地区：[1]Soil and Water Science Department, University of Florida, Gainesville, FL, USA

出　　处：《Science China(Life Sciences)》2005年第z1期1-6,共6页中国科学（生命科学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 20225722) for distinguished young scholars;a component part of 973 Project (approved No.2004CB418503) supported by the Ministry of Science and Technology,People's Republic of China.

摘　　要：In order to evaluate ecological risk of agrochemicals in common use, joint toxic effects of acetochlor and urea on germinating characteristics of Chinese cabbage (Brassica Pe-kinensis Rupr) seeds were investigated using the water-culture method and the soil-culture method. The results indicated(that excessive application of acetochlor and urea, when the concentrations were higher than 31.3 mg · kg-1 for acetochlor and 500 mg · kg-1 for urea, had strong inhibitory effects on the rate of seed germination, root elongation and hypocotyl length of Chinese cabbage. The inhibitory rate of the germinating characteristics of Chinese cabbage seeds was significantly increased with an increase in the concentration of acetochlor or urea. The two agrochemicals in water had a stronger toxicity than these in the soil at the same concentration. Among the three indexes, hypocotyl length was the most sensitive to the toxicity of acetochlor and urea.In order to evaluate ecological risk of agrochemicals in common use, joint toxic effects of acetochlor and urea on germinating characteristics of Chinese cabbage (Brassica Pekinensis Rupr) seeds were investigated using the water-culture method and the soil-culture method. The results indicatedthat excessive application of acetochlor and urea, when the coninhibitory effects on the rate of seed germination, root elongation and hypocotyl length of Chinese cabbage. The inhibitory rate of the germinating characteristics of Chinese cabbage seeds was significantly increased with an increase in the concentration of acetochlor or urea. The two agrochemicals in water had a stronger toxicity than these in the soil at the same concentration.Among the three indexes, hypocotyl length was the most sensitive to the toxicity of acetochlor and urea.

关 键 词：ecotoxicology  JOINT effect  acetochlor  urea  AGRICULTURAL ecosystem. 

分 类 号：S481.1[农业科学—农药学]