| Author | Azhar, Mohammad |
| Call Number | AIT Thesis no. AE-88-02 |
| Subject(s) | Wheat--Irrigation
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A simulation model has been developed on the basis of experimental
observations in the field r elating crop water us e a nd yield . Using a
water balance approach the model predicts the soil moisture contents of
five layers in the soil profile of 120 cm depth, on a daily basis by
taking into consideration crop parameters, soil physical properties and
climatic conditions. The model also predicts grain yield at the end of
crop growing season.
The water uptake by plants has been considered by using a sink
function. The model was calibrated for the prediction of grain yield by
relating ratio of the actual to the potential transpiration at five crop
growth stages to the ratio of actual to potential grain yield by a
multiplicative type of crop production function. The Model was
evaluated under prevailing irrigation practices. Th e mean absolute
variation between predicted and observed soil moisture was about 8.2 %.
The model was used to predict the irrigation schedules for obtaining
maximum yield. It predicted six irrigations for obtaining maximum yield
as a function of water provided the nutrient level is optimum.
The results obtained using the simulation model were compared with
the results obtained using a mathematical model based finite difference
solution to the governing flow equations in soil profiles. Predictions
from both the models were in close agreement with the observed data in
the field. |
| Year | 1988 |
| 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) | Murty, V.V.N ; Nielsen, Jens Moller
|
| Examination Committee(s) | Mizutani, Masakazu ;Paudyal, Guna N. |
| Scholarship Donor(s) | The Government of Netherland |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |