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The direct assessment of denitrification suffers from a number of problems. A mass balance model is simple and widely accepted to calculate nitrogen (N) loss as a denitrification component. The objective of study was to estimate the potential N loss a denitrification from a tropical paddy in the central region of Thailand. N inputs to and outputs from field were measured by direct method. Inputs of N to the site were commercial fertilizer, precipitation, irrigation water, seeds and pre-cultivation soils. Outputs of nitrogen from the site were leaching to groundwater, harvested crops, loads in surface runoff, post harvest soils and loss from the field as denitrification. Biological N fixation, groundwater contribution, ammonium volatilization and contribution to weed growth were ignored. Based on the three month observation, the total amount of N load in irrigation, precipitation, fertilizer, drainage, percolation and plant uptake were 9.22, 10.85, 100, 4.65, 18.20 and 80.57 kg ha -1 respectively. The difference of total N in the soil before and after cultivation was not significant and taken as constant value. Sum of N loss calculated as denitrification component from the nitrogen mass balance model was 16.7 kg ha -1 and rate of loss was 0.19 kg ha -1 d -1 . It means that the contribution of applied N fertilizer to the atmosphere was 13.6% of total N input; indicating one of the major source pollutants.

Denitrification as a component of Nitrogen Budget in a Tropical Paddy Field