000			04219nas|a2200397 i 4500
005			20260817163534.0
008			040430s2003 th u m rtt 00| a1eng d
035			_a.b11923982
099		9	_aAIT Thesis no.EV-03-12
100	1		_aAli, Miah Rahmat
245	1	0	_aAssessment of cypermethrin residue in Peri-urban agriculture : _ba case study of Chinese Kale and its growing soils
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2003
300			_a77 leaves : _bill.
490	1		_aThesis ; _vno. EV-03-12
502			_aThesis (M.Sc.) - Asian Institute of Technology, 2003
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science. Inter-University Program on Environmental Toxicology, Technology and Management.
520			_aCypermehrin is a synthetic pyrithroid used to control a variety of pest. As the natural pyrithroid is readily degradable in the natural condition with known to environmental friendly, the synthetic pyrithroid was introduced in to the market. A commercial cypermethrin product containing (RS) - oc -cyano-3 - phenoxybenzyl (lRs, 3RS; IRS, 3RS) - 3 (2, 2-dichlorovinyl) -2, 2-dimethylcyclopropanecarboxylate having effective concentration 25% w/v, was obtained from a local market and had been used through out the study. The experiment was designed in a randomize complete block design (RCBD) consisting of four blocks (Block I, Block II, Block II, & Block IV) and three replicates (T1, T2, & T3) under each block. The soil of the experimental plot has its pH is slightly acidic (5-6.5), soil organic carbon is high (4%) and the soil type is clay (60% clay content). In this experiment, three concentrations of pesticide were applied. In treatment 1 (T1) no pesticide was applied, so the active compound applied was 0 gm /ha; and for treatment 2 (T 2) and treatment 3 (T 3) the dose was 10 gm/ha and 30 gm/ha respectively. T 1 and T2 were covered by plastic at the surrounding of the plot at all times, and on the top during the application of pesticide in this and surrounding fields but T 3 was uncovered all the time. The experiment was conducted in rainy season and there was also an option to watering the vegetables twice a day from the shallow cannel surrounded. Both the soil and vegetable were collected according to the schedule and tested in the laboratory. Dose dependent yield and maximum residual limit in the Chinese kale was found in the study. The amount of cype1methrin found in the soil samples were directly correlated with the doses applied. In this experiment, it was found that water has no potential effect in removing the pesticide residue from the Chinese kale plants. The degradation time needed to be degraded 50% of the compound (DT50) was found from 4 to 5 days and DT90 was found from 17-19 days. A filter paper acute toxicity test using earthworms as the test organism was also conducted in the laboratory condition with the local Thai earthwo1ms and the median lethal concentration that kills 50% of the organism (LC50) was found at 1.03 mg/cm2 , LOEL was observed at 0.001 mg/ cm2 and the NOEL was observed at 0.0001 mg/cm2 of the filter paper.
650		0	_aPesticides _xEnvironmental aspects
650		0	_aPesticides _xToxicology
700	0		_aPreeda Pakpian, _eChairperson
700	0		_aJutamaad Satayavivad, _eExamination committee
700	0		_aThammarat Koottatep, _eExamination Committee
710	2		_aThe Royal Government of Netherlands, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-03-12
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B08222
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902			_a240417
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