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The role of soil drainage in crop production has been reviewed by Luthin (1957) and Van Schilfgaarde (1974) and the derivation of suitable spacings between drain lines was discussed. It was noted that proper spacings calculated for one region cannot readily be applied to another climatic area. Donnan and Schwab (1974) related drain spacing to drain depth, hydraulic conductivity of the soil and to the amount of soil water to be drained. Since hydraulic conductivity is dependent, in part, on texture, soil type becomes an important consideration. There are more than one million hectares of Brookston clay and associated soil types in Southwestern Ontario. The Brookston soil is classified as an Orthic Humic Gleysol characterized by extremely flat topography and poor natural drainage with profile characteristics as detailed by Richards et al. (1949). It has been learned through field experience that this soil requires subsurface drainage and the most common spacing has been reported (Irwin 1973) to be 15m between drains at a depth of 70-80 cm. Within the past several years, corrugated plastic drainage tubing has been available commercially. It has been installed by conventional wheel trenchers, and more recently, by drainage plows (Fauss et al. 1972) that prepare the drain bed and install the tubing in a once-over operation.
corn, soybean and wheat yields on brookston clay drained by plastic tubing installed by two methods at seven spacings and two depths
Bolton, E. F., Dirks, V. A. and F. R. Hore 1980. CORN, SOYBEAN AND WHEAT YIELDS ON BROOKSTON CLAY DRAINED BY PLASTIC TUBING INSTALLED BY TWO METHODS AT SEVEN SPACINGS AND TWO DEPTHS. Canadian Agricultural Engineering 22(2):145-148.
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