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1980—1983年在河北省饶阳县及安徽省濉溪县的不同的土壤肥力类型、不同的棉花品种和不同的栽培管理条件下进行了模拟为害和自然为害的试验,旨在确定第二代棉铃虫Heliothis armigera(Hübner)数量与棉花Gossypium hirsutum L.产量和质量的关系。试验结果表明,棉花对于第二代棉铃虫为害的补偿力很强,这种补偿力随着土壤肥力的提高而增强。棉花品种、年份以及栽培管理方法对补偿力的影响属于次要。通过组建的一个静态模型,收进了二代棉铃虫防治的直接收益与代价以及间接收益与代价,算得高、低肥力地的第二代经济阈值,百株累计卵量分别为332粒和34粒。产量水平在80—90斤的中等偏低肥力地,其阈值可定为60粒。
1980-1983 Simulated damage and natural damage were tested in different soil fertility types, cotton varieties and different cultivation and management conditions in Raoyang County, Hebei Province and Suixi County, Anhui Province in order to confirm the second generation boll bolls Relationship Between the Number of Heliothis armigera (Hübner) and the Yield and Quality of Cotton Gossypium hirsutum L. The test results showed that the compensatory power of cotton to second-generation cotton bollworm damage is very strong, and this compensation force increases with the increase of soil fertility. The effect of cotton variety, year and cultivation management method on compensatory power is secondary. Through the establishment of a static model, the second generation economic thresholds of high and low fertility, including the direct benefits and costs of second-generation cotton bollworm control, indirect costs and benefits, grain. The medium-low fertility level of 80-90 pounds can be set at 60 thresholds.