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Better irrigation methods are required to conserve our limited water resources for increased crop production. Interest has recently been renewed in subirrigation methods as a means of saving moisture. The usual subirrigation methods that depend on high water tables to supply moisture to growing crops have proved unsuitable in arid and semiarid regions where salinity problems develop with rising water tables (3). These techniques are limited to very specific soils with low soluble salt contents and an impervious subsoil so that the depth of the water table can be controlled. A recent method described by Zetsche (4) and Busch (2) uses buried pressurized plastic pipes to supply water to the soil. The distribution of soil moisture depends on its unsaturated movement within the soil profile without raising the water table. This technique shows promise in over coming the salinity problems associated with other subirrigation methods. Additional advantages of this method include a greater water use efficiency and the reduction in the operational labor. This paper reports the results of a study conducted at the Experimental Farm, Swift Current, to determine pressure changes in plastic pipes, water delivery rates from a subsurface water distribution system and to evaluate the technique of subirrigation under local conditions.
distribution rates and patterns for plastic subirrigation pipe
Pohjakas, K. 1966. DISTRIBUTION RATES AND PATTERNS FOR PLASTIC SUB1RRIGATION PIPE. Canadian Agricultural Engineering 8(1):37-38.
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