Abstract
Ammonia volatilization from urea and sheep manure in calcareous soil classificed as calci – camborthids , fertilizers were added sperately and together at rate 80 kg N.D-1 with agriculture sulphure at 2500 Kg.D-1 during four seasons (Spring ,Summure , Autumn, and Winter) 2003-2004 .Ammonia gas were collected under closed system in Boric acid 2% under feild conditions.The results showed sulphure caused a significant reduction in ammonia volatilization,for surface application,the percent of reduction were 28.79,44.41,35.07 and29.62% for urea ,8.45,15.67,10.89 and 27.27%for sheep manure during the four season respectively ,while the sub surface application caused more reduction in ammonia volatilization ,50.82,36.72,37.07 and 37.5% for urea and 62.27,15.59,19.43 and 66.66% for manure sheep during the four season respectively. This result may contribute in increasing of Nitrogen fertilization effeciency and contributed in the ecological contract.
