一、前言土壤一次性供水,系指除草剂经土壤处理后的土壤水分状况。除草剂施于土表后,受气象因素的影响,往往会逐渐失效。因此,尤其在免耕条件下,如何使所施除草剂尽快而均匀地布入一定的表土层,是化学除草技术中的重要问题。一次性供水量,直接关系到除草剂的毒作用。除草剂土壤处理的成功与否,取决于多种因素。在旱田,则与除草剂的使用剂量以及施药时或施药后的土壤水分状况关系较大。我国干旱与半干旱地区,一些研究工作者报道了除草剂土壤处理的效应受制于土壤水分。不少地方对除草剂土壤处理效应的反映也不一,时好时差,同地有时年间变幅较大。 I. Introduction Soil one-time water supply, refers to the soil after herbicide treatment of soil moisture status. Herbicide applied to the soil surface, the meteorological factors, often gradually failure. Therefore, under no-tillage conditions, how to make the herbicides applied to a certain topsoil as soon as possible is an important issue in the chemical weeding technology. A one-time water supply, directly related to the toxic effects of herbicides. The success of a herbicide soil treatment depends on many factors. In upland, it is related to the dosage of herbicide and soil moisture status after application or after application. Some researchers in the arid and semi-arid areas of our country have reported that the effect of herbicide treatment on soil is limited by soil moisture. In many places, the effects of herbicide treatment on soils are also different.