02909cas a2200253 a 450000500170000000800410001703500150005810000200007324501030009326000520019630000140024849000270026250001520028950200570044152018020049865000220230065000280232270000400235070000440239070000480243471000490248281000590253185600650259020260818134552.0111010s1992    th uu|m rtt   0|  a1eng d  a.b103506521 aTariq, Muhammad10aImprovement of a fertilization system for corn through control of the nutritional status of plants  aBangkok :bAsian Institute of Technology,c1992  a63 leaves1 aThesis ;vno. AE-92-40  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development  aThesis (M.Sc.) - Asian Institute of Technology, 1992  aA field experiment on corn crop was conducted on acid-sulphate soil at Agricultural Systems farm at Asian Institute of  Technology, Bangkok from January - May 1882 . It focused on (i)  improving the fertilization system mod e l for corn by providing  additional data on yield response to different N and P  application rates, (ii) determining the synergistic and  antagonistic effects of N, P, and K through plant analysis.  The experiment  complete block design  N and P resulting in  and P were Nl , NZ, N3  P3 (50 kg, 125 kg and  was laid- out in a factorial randomized  with three replications at three levels of  8 treatment combinations. The levels of N  (50 kg, 150 kg and 250 kg N/ha) and Pl, P2,  200 kg P/ha) respectively .  The above-ground plant parts were  N, P, and K six. times during the entire  P concentration was corrected at a fixed  of 5 gm/plant. This established the  developing the preliminary diagnosis and  A synergistic effect was found among N,  u se of N a nd P resulted in antagonism.  sampled and analysed for  growth period. The N and  dry matter weight level  basis for testing and  yield prognosis models.  P, and K but imbalanced  Results from this experiment we re in agreement with the  results of Amit (1890), Sumitrai (1889), Krishda (1988) ,  Labhsetwar (1878) and Lawongsa (1879). However, new areas were  revealed in the correction models from the n ew experimental  results. Yield prognosis models for N and P were broadened at the  yield level of 7.60 ton/ha, which was the highest among all  previous experiments conducted in connection with t his  fertilization system model.  Predicted yield based on diagnosis and yield prognosis  models was very near to the obtained yield , which further  substantiated the reliability and accuracy of the models.  0aPlantsxNutrition 0aFertilization of plants1 aNielsen, Jens Moller, eChairperson1 aGartner, J. A., eExamination Committee1 aSumitra Poovarodom, eExamination Committee2 aThe Government of Japan, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. AE-92-40  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B16594