Irrigation scheduling by water balance for lowland rice | |
| Author | Chungtuyco, Ricardo S. |
| Call Number | AIT Thesis no.WA-85-34 |
| Subject(s) | Plants|--Water requirements Irrigation farming |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | To predict the net irrigation demand and minimum interval for intermittent irrigation, the amounts and intervals of irrigation applications from transplanting till ripening of two high yielding rice varieties, RD 9 for dry season and RD 11 for wet season were analyzed for frequency of occurrence at different active storage, freeboard and seepage and percolation values. The amounts and intervals in 16 years of cropping were determined by a computer program through a simulation of the daily water level on the rice paddies of Chong Kae using a simple water balance model. Inputs to the model included crop evapotranspiration estimated from reference crop evapotranspiration computed by FAO-modified Penman equation from past climatic data: past records of daily rainfall: and estimated seepage and percolation. The model integrated the effects of crop evapotranspiration, daily rainfall, seepage and percolation, active storage and freeboard on the frequency of irrigation application. The total net irrigations corresponding to 0.10, 0.20 and 0.30 probabilities of exceedance and minimum application intervals corresponding to 0.10, 0.20 and 0.30 probabilities of non-exceedance were computed as prediction values. |
| Year | 1984 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Rahman, Md. Ataur |
| Examination Committee(s) | Christoph, Ing. Fried ;Nielsen, Mogens Dyhr |
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1984 |