STUDY ON UNDERDRAINAGE OF CATTLE PADDOCK

目前，奶农围场的土壤经常被奶牛排出的排泄物弄脏，而奶牛的揉制回流和排水沟也经常出现缺陷。并给出了围场排水不良对奶牛健康和挤奶的影响。1992年11月，对两个奶农围场进行了排涝改造。以这两个奶农围场为调查对象，对围场建设前后5年的土壤含水量、土壤的3个阶段以及土壤的静态玉米渗透情况进行了调查。结果表明，围场土壤的含水率在修建底渠后显著降低。此外，筑底排水后，围场土的三相气相速率、固相速率和液相速率均有所降低。围场排水沟的改善提高了围场土壤的承载能力，促进了奶牛的行走。在奶农围场修建下排水沟，对改善围场排水沟，改善奶牛的生活环境有一定的作用。

Always the paddock soil is mudded by excreta that cows exhausted and the kneading returns an drain are always defective in dairy farmers'paddock now. And, the influence with a badness for cows'health and milking defective drain of the paddock is given.The under drainage was constructed to two dairy farmers'paddocks to do the under drainage improvement of such paddocks in November, 1992.We investigated these two dairy farmers'paddocks as an investigation target for five years before and after construcion about the moisturs content of soil, the three phases of soil, and the static corn penetration of soil.As a result, the moisture content of the paddock soil decreased remarkably after having constructed the under drainage. Moreover, the rate of the gas phase and the rate of the solid phase after constructing the under drainage and the rate of the liquid phase has decreased in the three phases of paddock soil. The improvement of drain in this paddock rose bearing capacity and facilitated walking of cows of ground power of the paddock soil in the paddock. As for the construction of the under drainage to dairy farmers'paddock, it has been understood to be useful for the improvement of the drain of the paddock and to improve cows'life environments according to the result.