Effect of nitrogen, phosphorus and calcium fertilizers on the yield of two varieties of low land rice under rain-fed conditions | |
| Author | Banda, B. M. B. Amitharathne |
| Call Number | AIT Thesis no. AE-87-41 |
| Subject(s) | Rice--Fertilizers and manures Nitrogen fertilizers |
| 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 effect of nitrogen CO, 75, 150 kg/ha), phosphorus < 0, 20, 40 kg/ha) and calcium fertilizer < 0, 10 t of CaC03/ha) on the yield of two varieties of low land rice< RD-23 and KDM-105) on an acid sulphate soil was studied under s mall-scale rain-fed farming conditions. Yield of rice, by-products and their quality were taken into account in studying the effect of fertilizers on yields of the two varieties. Economic analysis and calculation of nitrogen recovery of rice production at different treatments were made to facilitate comparison of cash and nitrogen flows . The results have indicated that the two varieties of rice respond differently as far as quantity and quality is concerned under different rates of nitrogen a nd phosphorus. Further, the experiment showed that applying lime at 10 t/ h a in addition to N and P fertilizers gave no increase in grain yield. Grain and straw yield data indicated that, phosphorus is the dominant deficient nutrient for rice production on acid sulphate soils. Grain and straw yield of rice at different phosphorus levels were determined by nitrogen due to relative deficiency of nitrogen in relation to phosphorus. Application of nitrogen and phosphorus affected yield and quality of rice. RD - 23 produced 5 tons of grain/ha at 150kgN + 40kgP/ha application with 6350 B/ha net profit and 50% nitrogen recovery. Maximum grain yield produced from KDM - 10 5 was 2. 75 t/ha at 75 kgN + 20 kgP/ha application with 4300 B/ha net profit and 55% nitrogen recovery. Right combination of nitrogen and phosphorus application could improve nitrogen and cash flows in the system. |
| Year | 1987 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Gartner, Joseph A. |
| Examination Committee(s) | Nielsen, Jens Moller ;Peacock, Christabel P. |
| Scholarship Donor(s) | Food and Agriculture Organization of the United Nations(FAO/UN) |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology,1987 |