| Author | Lohani, Vinod Kumar |
| Call Number | AIT Thesis no. AE-82-08 |
| Subject(s) | Irrigation farming
|
| Note | A thesis submitted in partial fulfilment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Field experiment with rice crop was conducted during the dry season of 1982 at the experimental site of the Asian Institute of Technology. The rice
experiment was aimed at (i) studying the effect of three different flooding depths on the growth characteristics, grain yield and water requirement of
the RD-7 rice variety, (ii) developing a computer program for the irrigation schedule, for the rice crop based on experimental data. The data of the soybean experiment conducted by Sharma were used to develop an irrigation scheduling program which incorporated the various criteria of selecting the depletion
level at different stages of soybean growth. In the case of the rice experiment, the plant height was recorded maximum
(118 cm) for the plants under deep and medium flooding and the number of tillers per hill at harvest were 24, 26 and 27 for shallow, medium and deep flooded treatments respectively. Grain yields of 3167, 2885 and 3448 kg/ha were found
from shallow, medium and deep flooded plots. The water use efficiency was highest (.56 g/l) in the case of deep flooding. The total evapotranspiration
demands for shallow, medium and deep flooded treatments for a period of 85 days were 621.3, 618.8 and 622.4 mm respectively. An irrigation scheduling program, which was verified with the experimental schedules, was developed and
it could predict schedules by feeding in inputs of the type of soil, deep percolation loss, date of transplanting and required flooding depth. Another irrigation scheduling program was developed for soybean. Various criteria for the selection of depletion levels for scheduling irrigations for this crop were tried and it was found that the criterion of considering the
moisture sensitivity of different stages for the selection of depletion levels was best in terms of the number of irrigations. |
| Year | 1982 |
| 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) | Rahman, Md. Ataur
|
| Examination Committee(s) | Jensen, Jens Raunso ; Apichart Anukularmphai ; Christoph, Ing. Fried
|
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1982 |