1 AIT Asian Institute of Technology

Effects of soil- and fertilizer-phosphorus and lime on soybean response

AuthorVonlaya Viriyasenakul
Call NumberAIT Thesis no. AE-83-08
Subject(s)Soybean
Liming of soils
NoteA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
PublisherAsian Institute of Technology
AbstractThe response of soybeans to varying soil-P levels and to fertilizer-P and lime applications were investigated in a pot experiment on an acid sulfate soil. In the soil-P experiment, seven soils were limed to the same pH level of 7. 5. Soybean greatly responded to varying soil- P levels. Linear correlations were presented for the relationships between values for two chemical soil-P tests both before sowing and at maturity ,and dry matter of soybean seeds, P concentration and P uptake of seeds and of straw. Soil-P determined by Bray II and Olsen methods were positively and significantly correlated with yield, P concentration of seed and P uptake of seed and of straw, but not with the concentration of P of straw . In the fertilizer-P and lime experiment, three levels of lime and four levels of P were applied in all combinations. Dry matter yields, P concentration and P uptake of seed and straw were significantly increased with increasing P applications, whereas with increasing lime applications, they increased from L to L1 and decreased from L1 to L2 at all P levels. In limed soils, P and exchangeable Ca increased with a concomitant decrease in exchangeable Al and a decrease in concentration of Mn and Zn in seed and straw. Increasing P applications in unlimed treatments caused plants to show chlorosis symptoms. Water use efficiency varied from 299 (L2P0) to 1313 (L1P3) mg DM produced/kg of water used.
Year1983
TypeThesis
SchoolSchool of Environment, Resources, and Development
DepartmentDepartment of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB))
Academic Program/FoSAgricultural and Food Engineering (AE)
Chairperson(s)Eppendorfer, W.H.
Examination Committee(s) Jensen, Jens Raunso ; Rahman, Md. Ataur
Scholarship Donor(s)Japan
DegreeThesis (M.Sc.) - Asian Institute of Technology, 1983


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