Borah, Apurba Kumar creator Gee-Clough, D. Chairperson Gupta, Chandra P. Examination Committee Cochran, Billy J. Examination Committee Government of Australia Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1985 continuing eng 83 p. Field tests were performed on the AIT developed manual rice transplanter IA-2 under three seedling ages : 21-24 days, 25-28 days and 29-32 days; three water depths: 0-3cm, 3.1-6cm and 6.1-10cm: 6 variations of sedimentation period: 1,3,5,7,9 and 11 days after final levelling and standard soil condition (1 plowing, 1 puddling and then levelling 7-10 days before transplanting). Machine performance was also compared with traditional hand transplanting method. the machine performed better with 25-28 days old seedlings having non-productive hills ranging from 7.5%-12.5% in all three water depths. The machine can be used after the 5th day after final levelling in Bangkok clay soil. The field capacity was measured to be 0.0203 ha/hr at an efficiency of 56% and field machine index 74.4%. Performance of the transplanter was satisfactory in comparison to traditional hand transplanting method. It saved about 40% labor requirement (excluding) nursery preparation) over hand transplanting. At present wage level(1985) in Thailand, machine planting has a break even level at 6.0 ha for single cropping and 3.0 ha for double cropping per year. Possible modifications were recommended for further development to improve performance. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1985 Transplanting machines Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B19928 http://203.159.5.9/ait-thesis/detail.php?q=B19928 110910 20260818114720.0