Effects of soil- and fertilizer-phosphorus and lime on soybean response | |
| Author | Vonlaya Viriyasenakul |
| Call Number | AIT Thesis no. AE-83-08 |
| Subject(s) | Soybean Liming of soils |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The 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. |
| Year | 1983 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Eppendorfer, W.H. |
| Examination Committee(s) | Jensen, Jens Raunso ; Rahman, Md. Ataur |
| Scholarship Donor(s) | Japan |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1983 |