(接上期)16.烟草:烟草种子极小,幼苗生长缓慢,在一般情况下,如苗床发生杂草为害,则影响烟草生长;如移栽田发生杂草为害,将使烟草长势矮小。特别是烟苗受到藜、蓼、苋、苍耳等高大植株的欺压,或旋花、棒草等缠绕蔓茎的侵扰,不仅争肥、争水,还要强烈的争夺阳光。覆膜的烟田,往往杂草丛生,甚至顶破地膜,不仅为害烟草生长,还会影响地膜效益。建议烟草用药以封闭为主,敌草胺、二甲戊灵都是很好的选择,可亩用50%敌草胺WP130~260克/亩或33%二甲戊 Tobacco: seed of tobacco is extremely small and seedlings grow slowly. Under normal circumstances, if weeds damage on the seedbed, the growth of tobacco will be affected. If weeds are damaged in the transplanted fields, the growth of tobacco will be short. In particular, tobacco seedlings are subject to bullying by tall plants such as Chenopodium album, Polygonum, amaranth, Xanthium, etc., or entangled stems such as convolvulus and sticks, which not only compete for fertilizer and water, but also compete strongly for sunshine. Film covered tobacco fields, often overgrown, or even break the film, not only harmful to tobacco growth, but also affect the film benefits. Proposed tobacco drug to be closed-based, dithiocarbamide, pendimethalin are good choices, can be used 50% of rifenamide WP130 ~ 260 g / acre or 33% penta