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阈值参量的确定是解决农田杂草防除阈值问题的关键。本文从杂草危害作物的生态学机制和田间试验结果两方面讨论了密度阈值体系的缺陷，拟提出以系统序参量作为阈值参量。生态经济阈值以作物生长后期的序参量（ｑ２）表示；生态经济除草阈值以作物与杂草竞争临界期的序参量（ｑ１）表示，从而对生态经济（除草）阈值的概念进行了修正，并在夏大豆田杂草防除阈值的初步研究中进行实践检验。得出夏大豆田生态经济阈值为１６．９～６４．７，生态经济除草阈值为９．１～２１．１。
The determination of threshold parameters is the key to solve the threshold problem of farmland weed control. In this paper, we discuss the shortcomings of the density threshold system from the aspects of the ecological mechanism of crop weeds damage to crops and the field test results. It is proposed to use the system order parameters as the threshold parameters. The eco-economic threshold is expressed as q2, which is the later stage of crop growth. The eco-economic weeding threshold is modified by the order parameter (q1) of the critical stage of crop-to-weed competition, and the concept of eco-economic In summer soybean weed control threshold of a preliminary study of practical tests. The ecological economic threshold of summer soybean field is 16.9-64.7, and the ecological and economic weeding threshold is 9.1-21.1.