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008 020823s2002 th uzm rtt 00| a1eng d
035 _a.b11864370
099 9 _aAIT Thesis no. WM-01-13
100 1 _aPathak, Bipin Kumar
245 1 0 _aAssessment of nitrogen dynamics on a daily basis in a tropical paddy field
260 _aBangkok :
_bAsian Institute of Technology,
_c2002
300 _a81 leaves
490 1 _aThesis ;
_vno. WM-01-13
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering
502 _aThesis (M.Eng.) - Asian Institute of Technology, 2002
520 _aAn assessment of N dynamics was conducted in the central region of Thailand. The objective of study was to assess the N mass balance, nitrate leaching to groundwater and N loss to the atmosphere from a tropical paddy. The study period was 87 days. Daily measurement of evapotranspiration, ponding depth, irrigation water, drainage water and precipitation were performed in the field. From the water balance, percolation water was determined. N fertilizers were applied at three different doses and total amount was 100 kg N ha-1. Vacuum lysimeters were installed to collect the soil water solution. The soil and water samples were collected at different time intervals and N concentrations were measured. N dynamics was analyzed daily to determine the relationship between daily N available and N loss to the atmosphere and water. It was observed that loss of N through the emission into the atmosphere and outflow to the water from the field corresponded to 36.08% of total applied N. This indicates that more than one third of fertilizer input is responsible for environmental pollution if the same conditions prevail. Decision-makers are recommended to formulate strategy and plan to reduce the loss of N. The observed average N03-N leached to the groundwater was 0.04 kg ha-1 d- 1. It was also observed that fertilizer application induced a five-fold increase of N03- N concentration. This indicates that groundwater aquifers under paddy fields are vulnerable due to N03-N leaching.
650 0 _aNitrogen
650 0 _aSoils
_xNitrogen content
650 0 _aWater
_xNitrogen content
700 1 _aIida, Toshiaki,
_eChairperson
700 0 _aSuphat Vongvisessomjai,
_eExamination Committee
700 1 _aClemente, Roberto S.,
_eExamination Committee
700 1 _aAnnachatre, Ajit P.,
_eExamination committee
710 2 _aThe German Academic Exchange Service (DAAD),
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. WM-01-13
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B07778
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