000			03390cas a2200421 a 4500
005			20260818214056.0
008			110920s1988 th uu|m rtt 0| a1eng d
035			_a.b10603396
099		9	_aAIT Thesis no. AE-88-02
100	1		_aAzhar, Mohammad
245	1	0	_aSimulation of irrigation schedules for improving wheat yields
260			_aBangkok : _bAsian Institute of Technology, _c1988
300			_a128 p.
490	1		_aThesis ; _vno. AE-88-02
500			_aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1988
520			_aA 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.
650		0	_aWheat _xIrrigation
700	1		_aMurty, V.V.N., _eChairperson
700	1		_aNielsen, Jens Moller, _eCo-Chairperson
700	1		_aMizutani, Masakazu, _eExamination Committee
700	1		_aPaudyal, Guna N., _eExamination Committee
710	2		_aThe Government of Netherland, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-88-02
856			_3Full-Text _uhttp://203.159.12.5.9ait-thesis/detail.php?q=B18903
907			_a.b10603396 _bmnait _cs
902			_a240410
998			_b2 _c951012 _dm _ea _fs _g0
945			_lmnait
945			_lmnait
945			_lmnarc
942			_c20
942			_c40
909			_aBarcode : 30050003002887 _bCREATED : 1994-05-18 _cRECORD # : i10764069 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050003002853 _bCREATED : 1994-05-18 _cRECORD # : i10764070 _dLPATRON : 1024165 _eLCHKIN : 2014-01-28 _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 1 _jTOT RENEW : 0
909			_aBarcode : 30050120300636 _bCREATED : 2016-05-26 _cRECORD # : i12995873 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c107156 _d107156