摘要
采用田间试验方法,研究了代森锰锌及其代谢物乙撑硫脲(ETU)在荔枝及土壤中的残留动态。结果表明,质量分数为80%的代森锰锌可湿粉剂在荔枝树上喷施后,主要残留在荔枝果皮中,且消解速度较快,其中母体消解半衰期为4. 02~5. 14d; ETU消解半衰期为2. 52~3. 24d;代森锰锌及ETU在土壤中消解较快,半衰期分别为5. 63~9. 88d和4. 95~14. 2d。施药1 600mg·L-1,使用4次,末次施药距收获间隔10、20和30d,荔枝果肉中代森锰锌残留量均小于1mg·kg-1,代谢产物ETU均小于0. 02mg·kg-1。该药为易消解农药(t1 /2 <30d),按推荐剂量使用是安全的。
A field experiment was conducted to reveal dynamics of mancozeb residue and its metabolite ethylenethiourea (ETU) in litchi and soil.Residues of mancozeb and ETU were found mainly in pericarp of litchi,and degraded rapidly.The half-life of the former in litchi was 4.02~5.14 d and of the latter 2.52~3.24 d. And they also degraded rapidly in the soil,with their half-life being 5.63~9.88 d and 4.95~14.2 d,respectively. The results of the two-year experiment show when the litchi were sprayed four times with 1 600 mg·L^(-1) mancozeb 80% WP (1∶500),and the last application was done 10,20 or 30 days before harvesting, the residue of mancozeb in the pulp of harvested fruit was lower than 1 (mg·kg^(-1)),and ETU residue below 0.02 mg·kg^(-1),demonstrating that it is safe to apply mancozeb to litchi with the recommended rate.
出处
《农村生态环境》
CSSCI
CSCD
北大核心
2005年第2期58-61,共4页
Rural Eco-Environment
基金
美国罗门-哈斯公司合作研究项目
关键词
代森锰锌
乙撑硫脲
荔枝
残留
mancozeb
ethylenethiourea
litchi
residue
