02028cas a2200241 a 450000500170000000800410001703500150005810000200007324500830009326000520017630000100022849000270023850001560026550200580042152009730047965000380145270000330149070000470152370000470157071000450161781000590166285600650172120260818134647.0110910s1985    th uu|m rtt   0|  a1eng d  a.b103516811 aKumar, Vijendra10aImproving the performance of Thai traditional animal-drawn mould board ploughs  aBangkok :bAsian Institute of Technology,c1985  a64 p.1 aThesis ;vno. AE-85-14  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1985  aThere is an extensive use of animal drawn mould board board ploughs in north-eastern Thailand. The Manufacturers of animal drawn ploughs have little idea of the shape-draft relationship. The plough bottoms of various shapes which are popular in the region have been tested in dry sandy loam soil conditions in a soil bin, using strain gauge mounted load rings, at typical speed and ploughing depth for animals. A significant variation in the horizontal, vertical and side forces was found. all the plough bottoms showed a common tendency of inverting soil in fairly equal amounts both to right and left. Only a small variation in soil inversion angles was seen. The plough bottom with low (not the lowest) lift angle and difference in radius of curvature as the soil particle moved from point of rest to about-middle of the surface of the mould board, has been proved the best-performing one from the view point of specific draft, inversion angle and plough capacity.  0aAgricultural implementszThailand1 aGee-Clough, D.,eChairperson1 aGupta, Chandra P., eExamination Committee1 aCochran, Billy J., eExamination Committee2 aGovernment of Japan, eScholarhsip Donor2 aAsian Institute of Technology.tThesis ;vno. AE-85-14  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B19934