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005			20260818094216.0
008			160398 th eng
035			_a.b10213843
099		9	_aAIT Thesis no. 1080
100	1		_aTalukder, Md. Shahid Ullah
245	1	0	_aDry season water utilization studies of selected crops in the North-East of Thailand
260			_aBangkok : _bAsian Institute of Technology, _c1978
300			_a91 p.
490	1		_aThesis ; _vno. 1080
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1978
520			_aThe study was conducted in the Northeast Thailand in dry season, 1978. Sweet corn and mungbean were grown in uplands in farmers' field under irrigated conditions. Irrigation was made on the basis of atmospheric evaporative demand using a range of experimental coefficients as a guiding factor. The same coefficients were used for the range of fertility treatments. The objectives were to determine the water requirement for both the crops with respect to an atmospheric evaporative demand; to determine the yield response surfaces for water and fertility treatments, to determine application efficiency of surface irrigation for stages of crop growth and depth of rooting of the crops and to study the rooting depth and rooting distribution of both the crops with respect to treatments. The results reveled that the water requirement for sweet corn was found to be 6.8 mm/day. The water requirement of mungbean, on the other hand was determined to be 3 mm/day. Those water requirements are the total amount of water depleted for the entire growing season of both the crops divided by the length of season. Although there are discrepancies in results within the treatment combinations; yet pan coefficient 1.2 for sweet corn and 0.6 for mungbean has been found to be best suited for calculating irrigation timings and fertilizer applications. The study further reveal s that maximum yield was obtained in I5 F5 treatment combinations for sweet corn and although I5 F5 have given the maximum yield for mungbean, yield of I3 F 3 treatment could be used because variation in yield between this two treatment is only 92 kg/ha. However, higher yields could be achieved for mungbean if the root nodulation had occurred. Likewise, yield of sweet corn was also affected by a sudden strong winds (speed 50 km) during tasseling stage. Significant yield responses were attained for both the crops with higher coefficient of determination. Moreover, yield response surfaces described on three dimensional figures resemble more or less with what has been mentioned before. Excepting few application efficiencies all were irrigation adequacies which mean that the water applied is adequate up to certain percent but not to the full extent. Rooting depth had no effect on water and fertilizer applied. Distribution of root weights showed that 95 percent of the roots are distributed at a 0-20 cm depth for sweet corn. However, further studies are necessary for both the crops at least at 50 cm and 100 cm water table. This would help the irrigation engineers/planners to suggest farmers the efficient use of water at different situations and ultimately an optimal systems management approach could be achieved.
650		0	_aPlants _xWater requirements
700	0		_aApichart Anukularmphai, _eChairperson
700	1		_aEarly, Alan C., _eExamination Committee
700	1		_aSelvalingam, Selvadore, _eExamination Committee
700	1		_aI, Fude, _eExamination Committee
700	1		_aNielsen, Jens Moller, _eExamination Committee
710	2		_aBritish Columbia, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. 1080
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B22867
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