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我市麦田常见阔叶杂草约20科50余种,发生面积达250多万亩。以往推广春季用药,对荠菜、牛繁缕、麦家公等杂草的防效不够理想。1982年以来,我们在推广春季用药的同时,分别在几个县搞了秋季施药的试验、示范,结果表明,对麦田阔叶杂草的防除,在徐州地区应以秋季为主,春季为辅。(一)春季施药的不利因素1.春季用药适期为2月底至3月上中旬,这时,我市寒流频繁,低温多雨,光照少,对麦田化除非常不利。例如,1985年3月上旬就有6个雨日,平均气温3.23℃,光照2.86小
Common wheat broadleaf weeds in the city about 20 families of more than 50 species, the occurrence of an area of more than 250 million mu. In the past to promote the use of spring medicine, shepherd’s purse, chickweed, wheat and other weeds control effect is not ideal. Since 1982, we promote the use of medicines in spring and autumn respectively, in several counties in the trial of pesticide application and demonstration. The results showed that the control of broad-leaved weeds in wheat fields should be dominated by autumn in Xuzhou and spring auxiliary. (A) of the unfavorable factors of spring spraying 1. Spring medication is suitable for the end of February to March on the middle, then, the frequent cold in our city, low temperature and rainy, less light, in addition to the wheat is very adverse. For example, there were six rainy days in early March 1985 with an average temperature of 3.23 ° C and a light of 2.86 hours