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棉田化学除草,具有成本低,使用简便,省工,除草效果好等优点。1978年低塘地区推广化学除草面积已达1.1万亩,比1977年扩大了2倍。据近几年来的试验观察,棉田在播后芽前施药一次,其有效期长达50—60天,基本上可以解决苗期的草荒问题。在药剂有效作用期内,即使中耕松土1—2次,也仍然能保持良好的除草效果。我们曾试验了20余种除草剂的药效及施用技术,现简介如下。一、适于棉田播后芽前作土壤表层处理的除草剂及施用的有效剂量(亩)为:25%敌草隆3.5—4两;50%扑草净3两左右;50%除草剂1号3—4两;80%伏草隆(棉草完)2.5—3两;80%达克灵3—4
Cotton weed chemical, with low cost, easy to use, labor-saving, weeding effect is good. In 1978, the area under the promotion of chemical weeding in the low pond area reached 11,000 mu, an increase of two times that of 1977. According to the experimental observations in recent years, the cotton field is applied once after sowing and budding, and its effective period is as long as 50-60 days, which can basically solve the problem of grassland shortage in seedling stage. During the effective period of the pesticide, the weeding effect can still be maintained even if the soil is loosened 1-2 times. We have tested the efficacy and application of more than 20 kinds of herbicides, are summarized below. First, suitable for cotton after sowing before bud soil surface treatment of herbicides and the effective dose (mu): 25% diuron 3.5-4 two; 50% prometryn net about two; 50% herbicides on the 1st 3-4 two; 80% Fusulin (cotton grass finished) 2.5-3 two; 80% Dacrine 3-4