Rice yield components as influenced by nitrogen application | |
| Author | Cabural, Lydia P. |
| Call Number | AIT RSPR no. AE-85-01 |
| Subject(s) | Rice--Fertilizers and manures Nitrogen fertilizers |
| Note | A Research Study submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The influence of different levels of nitrogen fertilizer, 0-, 30-, 60-, 90-, 120 Kg/ha, on the growth and development of rice (Oryza sativa L) was measured every other two weeks until harvesting to determine relationships between N applications, yield components and final yield. Separate measurements of the sampling area and the harvesting area were done on each plot (treatment) to facilitate comparison of yield results. Analysis of yield components indicated that the major determinant of rice yield is total number of spikelets per square meter. There is good correlation between number of spikelets per square meter and nitrogen application. Filled spikelets or sterility percentages is affected by nitrogen application; usually low filled spikelets percentages at high levels of nitrogen. The 100-grain weight is a stable varietal character and rarely becomes limiting under most conditions. The rice yields in the sampling and harvesting area vary greatly. Rice plants in the sampling area yielded almost double based on yield components compared to 6 sample hills and 64 sample hills computation in the harvesting area. The yield ranges from 5.27 t/ha in 0 kgn-plot to 12.70 t/ha in 120 kgn-plot calculated from from 3.69 t/ha in 0 kan-plot to 7.71 t/ha in 120 kg N-plot. The yield in the harvesting area ranges from 3.41 t/na in 0 kgN-plot to 6.95 t/ha in 120 kgN-plot. The increased yield was correlated to the increased number of tillers at the vegetative stage. The increased number of fillers increases the panicle number and spikelet number at the reproductive stage. |
| Year | 1985 |
| Type | Research Study Project Report (RSPR) |
| 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) | Eppendorfer, W.H. |
| Examination Committee(s) | Jensen, Jens Raunso ;Rahman, Md. Ataur |
| Scholarship Donor(s) | Royal Thai Government |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 1985 |