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我国人工牧草品种很多，其中一年内可以多次收获的牧草占有很大比重。目前我国对牧草全生育期需水特性研究成果较多，但对刈割条件牧草需水特性研究的却很少。刈割改变了牧草的生育过程，同样改变了牧草的需水规律。在实际制定牧草灌溉计划及水利工程规划设计中，通常采用的牧草需水量估算方法由于没有考虑刈割对牧草作物系的影响，使随季节而变化的需水量值都存在着超估现象，严重影响着灌溉计划和精确程度和水利工程的设计规模。本文以呼和浩特地区首信和苏丹草两种牧草为例，通过对全生育期和刈割条件下的需水规律及需水量的试验资料进行对比分析，论述广刈割条件牧草的需水特性和刈割对牧草作物系数的影响，旨在为估算刈割条件下牧草需水量提供科学依据。
There are many varieties of artificial grass in our country, of which the pasture that can be harvested many times in a year occupies a large proportion. At present, there are a lot of research results on the water demand characteristics of forage during its whole growth period, but there are few studies on its water requirement characteristics. Mowing changed the fertility process of forage grass and changed the law of water demand of forage grass. In the actual forage irrigation planning and water conservancy planning and design, the commonly used forage water demand estimation method does not consider the impact of mowing on the pasture crop system, so that changes with the seasons of water demand values are subject to overvaluation, serious Affect the planning and accuracy of irrigation schemes and the design scale of water conservancy projects. This paper takes Capitel and Sudangrass in Hohhot as an example. By comparing and analyzing the water requirement and water demand under the condition of whole growth period and cutting conditions, this paper discusses the water requirement characteristics and mowing Cutting on the forage crop coefficient, aims to estimate the mowing conditions to provide a scientific basis for pasture water requirements.