000			04109cas a2200385 a 4500
005			20260818094518.0
008			111005s1990 th uu|m rtt 0| a1eng d
035			_a.b10220598
099		9	_aAIT Thesis no.AE-90-39
100	0		_aSuwanna Whangthongtham
245	1	0	_aEconomic and environmental implications of two alternative citrus production systems : _ba case study from Pathum Thani province
260			_aBangkok : _bAsian Institute of Technology, _c1990
300			_a132 p.
490	1		_aThesis ; _vno. AE-90-39
500			_a A thesis submitted in partial fulfilment of the requirements of the degree of Master of Science, School of Environment, and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1990
520			_aTh e economi c and environmental implications of two alternative citrus production systems were studi ed in two farms in Pathum Thani province. The investigation focused on the economic and environmental factors as affected by t h eir pest contro l practices ( c hemical pesticide and neem mixture extract). Measured of the economic and history performance of the farms were described and analysed. The economics of using neem mixture extract as a means of controlling pest was condu cted by counting the pests population on both farms. The environmental implication of using the different pesticides was described by the water quality, pesticide residues and a bioassay experiment of n eem. The soc i a l costs associated with the pest control practices were based on the results of a s u rvey on health hazards a mong the farmer population in Pathum Thani province. The study indicated that the main objective of a famer using chemic als is to maximize the Gross Margin resulting from his intensive man agement, while that of the n eem farmer is mo re oriented towards sustainability of the production system while achieving a specific level of Gross Margin. Neem mixture extract was significantly effective in controlling the pest such as leaf miners (Phyllocnitis citrella) at 1-4 days after spraying. Spiders were abundantly found in t he neem mixture farm, but were rarely observed in the ch emical farm. Most of the water quality parameters in both farms were similar, but the chemi cal pesticides residu es remaining in the water and fish were evident. This has implications as regards to the s uit ability of raising fish in the che mi cal orchard considering its possible e ffects on human heal th. Taking into consideration information from an opinion survey a mong aquaculture experts using delphi technique, Nil e tilapia (Tilapia n ilotica ) could be an appropriate species for introduction to the neem mixture extract farm. The health hazard· s urvey in the main citrus cultivation area showed that the chemicals used in citrus production are hazardous to the user's health. Social costs occur as medical fees and opportunity cost of labor. These cost will be saved by the society as a whole if a h armless pesticide such as the neem mixture extract will be use d on a larger scale.
650		0	_aCitrus fruits _zThailand _zPathum Thani _xResearch
700	1		_aWaibel, Hermann, _eChairperson
700	1		_aYakupitiyage, Amararatne, _eExamination Committee
700	0		_aAthapol Noomhorm, _eExamination Committee
710	2		_aThe Government of The United Kingdom, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-90-39
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18280
907			_a.b10220598 _bmnait _cs
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