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大豆收获前,选当地主栽品种,虫食率在60～80％的大豆地15～20块。每块地用大五点取样法,每个点取10株,共50株,自然干燥后,逐荚脱粒。混合均匀,随机取样,重复4次。每次取完整粒和虫食粒各1000粒,称百粒重。 1.大豆食心虫率与产量损失的关系 用完整粒百粒重减去虫食粒百粒重的差值是绝对产量损失,再除以完整粒百粒重所得是绝对重量减少百分率,然后乘以虫食率即为产量损失率。例如,嫩丰10号大豆田间虫食率6％,完整粒百粒重
Soybean harvest before the election of the local cultivars, insecticidal rate of 60 to 80% of soybean 15 to 20 pieces. Each site with a big five-point sampling method, each point to take 10, a total of 50, natural drying, by pod threshing. Mix well, random sampling, repeat 4 times. Each take the whole grain and worm grain 1000 each, said one hundred weight. 1. Relationship between Soybean Moth Bug Rate and Yield Loss The difference between the absolute weight loss and the absolute weight loss divided by the absolute weight loss divided by the absolute weight loss percentage for the intact grain weight minus the 100 grain weight value is multiplied by Insect feeding rate is the yield loss rate. For example, Nenfeng 10 soybean field insecticide rate of 6%, 100 full-grain weight