A Aye, Tin Maung creator Murali, N. S. Chairperson Upasena, Selawa H. Examination Committee Little, David C. Examination Committee Myers, R.J.K. Examination Committee Government of Japan Scholarship Donor text th Bangkok Asian Institute of Technology 1994 monographic eng

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76 leaves In a field trial on an acid sulphate soil, green manures gliricidia and leucaena, animal manures fresh goat manure and composted goat manure, and urea were applied as an N source for maize (Zea mays L. KTX 3501) at the rates of 25 and 50 kg N ha-1 {u2022} Growth of maize was determined largely by elevation of the plot. Elevation determined the degree of water-logging after irrigation. Crop growth and yield was strongly correlated with elevation. None of the N materials applied at 25 kg N ha- 1 supplied enough N to the crop to influence yield. Gliricidia and fresh goat manures at 50 kg N ha·1 resulted in growth and yield responses in maize similar to the response to added urea. Gliricidia applied at 50 kg N ha-1 increased plant height, dry matter accumulation, dry matter yield and N yield of maize compared with no N application. There were no significant affects of any material at either rate of application on net N mineralization, apparent N recovery or soil total N at harvest. Chemical constituents of manures such as concentration of N, lignin, polyphenol, and ratio of C:N, lignin:N, polyphenol:N, and lignin+polyphenol:N neither correlated with total dry matter yield nor with net N mineralization and apparent N recovery. The practice of using green manure as an alternative source of N fertilizer for maize is possible on acid sulphate soils in Thailand. A Thesis submitted in partial fulfillment of the requirements of the Degree of Master of Science, School of Environment, Resources & Development Thesis (M.Sc) - Asian Institute of Technology, 1994 Corn Fertilizers Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B15582 http://203.159.5.9/ait-thesis/detail.php?q=B15582 080598 20260817173413.0