000			03730nam a2200421 4500
005			20260818175904.0
008			301198s1998 th r 0000|0 eng d
035			_a.b11732295
099		9	_aAIT Thesis no. EV-98-4
100	0		_aPham Anh Dung
245	1	0	_aRelationship between the consumption pattern of agricultural chemicals and the distribution characteristics of micro-chemical compounds on a paddy field in Vietnam
260			_aBangkok : _bAsian Institute of Technology, _c1998
300			_a87 leaves
490	1		_aThesis ; _vno. EV-98-4
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1998
520			_aThis study was conducted to evaluate the mass balance of nutrient on the paddy field in tropical areas. Seven ha of paddy field was selected to investigate total amount of fertilizer input and output. Fertilizer dose that farmer applied for paddy field was found though questionnaire. Total amount of nitrogen against the required nutrient for growing up was 11.05 kg/ha, but total amount fertilizer P was higher than requirement that plant uptake is 2.63 kg/ha at average of applied ferilizer. On other hand, residue inorganic nitrogen and phosphorus retained in the soil layer was 1.32 ppm and 4.46 ppm respectively. At 85% probability, the residue of inorganic nitrogen and phosphorus was 4.9 ppm and 1.1 ppm, respectively (assume density of soil at 0-20 cm below depth was 1.4) The experiment results revealed that the total amount of fertilizer applied on paddy field 116.8 kg N/ha, 46.8 kg P20 5, 50 kg K/ha and 1,400 kg farmyard/ha. On other hand, concentration of nutrient (T-N, T-P) on the water drainage are 17.5 and 0.11 mg/l, respectively. And the residue of nitrogen and phosphorus was 12.38 kg/ha and 2.7 kg/ha, respectively. The concentration of arsenic on drainage channel and on vegetable growing area (0.0022 mg/l) is higher both the concentration of arsenic on pond and drainage channel of paddy field (0.0017 mg/l). Based on the result, this study could suggest some methodology to reduce the effect of agrochemical on human being and environment. Such as policy method (improve awareness of farmer, fertilizer subsidy, soil testing program) and cost of good agriculture practice (use farmyard fertilizer, slow release fertilizer)
650		0	_aFertilizers _zVietnam
650		0	_aSoil amendments _zVietnam
700	1		_aHa, Sung Ryong, _eChairperson
700	0		_aPreeda Pakpian, _eExamination Committee
700	1		_aNguyen, Thi Kim Oanh, _eExamination Committee
710	2		_aGovernment of Switzerland (SWISS-SDC), _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-98-4
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B12732
907			_a.b11732295 _bmnait _cy
902			_a240407
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