杂草与作物之间存在着化学他感作用，在杂草科学管理中利用化学他感作用是一个问题的两个方面，一方面是控制杂草对作物的异毒作用，另一方面是利用作物对杂草的异毒作用。通过栽培管理措施、利用基因工程和育种技术可提高作物的异毒作用。控制杂草的异毒作用，进行抗杂草基因的转移和物种选育，可培育抗杂草作物品种和开发生物除草剂。利用化学他感作用也存在一定的困难。 There is a chemical sensation between weeds and crops. The use of chemical sensations in the scientific management of weeds is one of two aspects of the problem, on the one hand to control the weed-specific effects of weeds on crops and, on the other hand, to use Crops are weed-specific. Through cultivation management measures, the use of genetic engineering and breeding techniques can increase the isothermic effect of crops. Control of weeds’ isothermic effects, resistance to weed gene transfer and species selection, resistance to weedy crop varieties and development of bio-herbicides. There is also some difficulty in using chemosensory effects.