| Author | Yoganathan, Ponnuthurai |
| Call Number | AIT Thesis no. 1240 |
| Subject(s) | Soybean--Fertilizers and manures
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science of the Asian Institute of Technology, Bangkok, Thailand |
| Publisher | Asian Institute of Technology |
| Abstract | A field experiment was conducted with soybean (Glycine max (L.) Merr.) on the acid sulfate soil of Bangkok Plain at the Asian Institute of Technology, Bangkok in the dry season of 1977 (Jan. - April). In order to determine the effects of irrigation and N fertilization on bean yield and to assist in developing and refining the diagnosis and yield prognosis models of soybean. A local variety, S.J. 2 was grown at three soil moisture regimes (20, 40 & 60% of available soil moisture capacity) with three levels of N applications (O, 30 & 60 Kg/Ha). The N was given as a basal dressing along with 100 Kg P/Ha and 100 Kg K/Ha. Plant samples were collected at fortnight intervals and the aerial parts were analyzed for the nutrient elements N, P, K, Na, Ca, and Mg . Growth observations were made regularly and at harvest the bean yield was determined.
Increasing applications of water increased the concentration of N, P, and Mg in the aerial parts and final bean yield. Water application had practically no effect on the concentration of K, Na, and Ca. Application of N increased the concentration of N, and also affected the concentration of P and Mg. The general convex yield curves for N were not obtained in the
intermediate and the high soil moisture regimes. The results showed no significant Nx water interaction effect on nutrient uptake or bean yield.
Reasonably high yields (3 T/Ha) were obtained at the highest levels of water and N. This implies that soybeans can be cultivated successfully on
the acid sulfate soil of Bangkok Plain in the dry season as a second crop with the right combination of irrigation and fertilization. Preliminary models of diagnosis and yield prognosis were developed based on the chemical composition of the young plants and were tested with satisfactory results. |
| Year | 1977 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Nielsen, Jens Moller |
| Examination Committee(s) | Singh, Gajendra ; Paiboon Prabuddham |
| Scholarship Donor(s) | Government of United Kingdom |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1977 |