03390cas a2200421 a 4500 20260818214056.0 110920s1988 th uu|m rtt 0| a1eng d .b10603396 AIT Thesis no. AE-88-02 Azhar, Mohammad Simulation of irrigation schedules for improving wheat yields Bangkok : Asian Institute of Technology, 1988 128 p. Thesis ; no. AE-88-02 A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1988 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. Wheat Irrigation Murty, V.V.N., Chairperson Nielsen, Jens Moller, Co-Chairperson Mizutani, Masakazu, Examination Committee Paudyal, Guna N., Examination Committee The Government of Netherland, Scholarship Donor Asian Institute of Technology. Thesis ; no. AE-88-02 Full-Text http://203.159.12.5.9ait-thesis/detail.php?q=B18903 .b10603396 mnait s 240410 2 951012 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003002887 CREATED : 1994-05-18 RECORD # : i10764069 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003002853 CREATED : 1994-05-18 RECORD # : i10764070 LPATRON : 1024165 LCHKIN : 2014-01-28 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050120300636 CREATED : 2016-05-26 RECORD # : i12995873 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 107156 107156 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. AE-88-02 30050003002887 2026-08-18 21:40:56 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. AE-88-02 30050003002853 2026-08-18 21:40:56 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. AE-88-02 30050120300636 2026-08-18 21:40:56 2026-08-18 40