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本文研究了春播苜蓿地田间杂草的生态经济阈值、生态经济除草阈值，建立了田间杂草密度与苜蓿干草损失率之间的关系；Ｐ＝１．９２６３＋０．８５３８ＬｏｇＸ。通过试验，建立了田间杂草的生态经济阈值和生态经济除草阈值模型。研究结果指出当春播苜蓿地中田间杂草密度低于其生态经济阈值时，不需要防除。
In this paper, the ecological and economic thresholds and ecological and economic weeding thresholds of field weeds in spring sowing alfalfa were studied. The relationship between field weed density and the loss rate of alfalfa hay was established. P = 1.9263 + 0.8538LogX. Through experiments, we set up the ecological economic threshold and the ecological economic weeding threshold model of field weeds. The results indicate that there is no need to control the density of field weeds in spring-sown alfalfa fields below their ecological and economic thresholds.