STUDY ON UNDERDRAINAGE OF CATTLE PADDOCK

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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.