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Minimum and zero tillage practices are being adopted by farmers in the Prairie region of Canada. The main problem associated with proper seed placement under these tillage practices is the density and toughness of crop residue. In order to place the seed at a proper depth, the crop residue must be cut by coulters and furrow openers. Tests by the Prairie Agricultural Machinery Institute of no-till drills (PAMI 1979a,b) have indicated that under heavy crop residue, the disc openers were unable to cut through the surface residue resulting in seed being placed either on the residue or on the soil surface. In lighter crop residue and in softer soil, the straw was pushed to the bottom of the furrow without being cut. Literature studies reveal that no work has been reported on cutting resistance of crop residue or the shear strength of straw which is an important parameter in de signing seeding machines for minimum and zero tillage practices. Researchers have concentrated their work on improvement of the design of the cutting blade to chop forage crops or to determine its energy requirements. A study was, there fore, undertaken to determine the shear strength of wheat straw as affected by its moisture content.
shear strength of wheat straw
Kushwaha, R. L., Vaishnav, A. S. and G. C. Zoerb 1983. SHEAR STRENGTH OF WHEAT STRAW. Canadian Agricultural Engineering 25(2):163-166.
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