薏苡田主要杂草及化学防除技术研究

Studies on Techniques of Weed and Its Chemical Control in Coix lachryma-jobi L Mayuen Roman Stapf Fields

薏苡田杂草有12科19种。采用苗前土壤处理，阿特拉津、乙莠合剂、施田补、甲磺隆、绿磺隆等防效显著，杀草谱宽；禾耐斯、拉索对禾本科杂草防效显著；苯磺隆、速收、阔叶枯对阔叶杂草防效好。所有药剂处理后浅混土比不混土防效显著。苗后茎叶处理，阔叶枯、甲磺隆、绿磺隆药效较慢，但对阔叶杂草防效最好；乙莠合剂、阿特拉津、利收药效快，但防效与杂草大小、施药均匀度关系密切，杂草较小、喷洒均匀防效较好，反之则差；2，4－D丁酯在阔叶杂草小时防效显著，大时受害严重但不死亡；施田补用于苗后茎叶处理防效较差。除收乐通以及与利收混配处理对薏苡有药害外，其余各处理均对薏苡安全。

This experiment was conducted to study techniques of weed chemical control in field. The design was in randomized block with 4 replications. With preemergence applications, the weed controlspectra by using Atrazine, Acetochor + Atrazine, Stomp, Sulfometuron-methyl, Chlorsulfuron werewider. The control effects were significant for Harness, Lasso to grass weeds, Sumisoya, Tribenuronmethy1, Kuoyeku to broadleaf weeds. For all the treatments, the weed control effects were more significant if surface soil and sprayers were mixed. With postemergence applications, although it needs longertime for Kuoyeku, Sulfometuron-methyl and Chlorsulfuron to kill broadleaf wed, the control effects werebest. Acetochor + Atrazine, Atrazine, Resource kill weeds in short time rapidly, but the control effectsare associated with the size of weeds and the uniform degree of spraying. 2,4-D control young broadleafweeds well. Coix lachryma-jobi L var mayuen Roman Stapf was safe to all sprayers except Selection andthe mixture.