تأثير مستويات اليوريا المضافة على تطاير الامونيا في ترب مختلفة النسجة

Abstract EN

Apot experiment was carried out to study the effects of urea rate fertilization 0 , 400 , 800 , 1200 Kg.h-1 in calcareous soils on ammonia volatilization from three different texture (clay , clay loam , and sandy loam) from mosul governorate classified calciorthids.

urea was broadcast on the surface soils and coverd.

soils were irrigated at 75% of field capacity and ammonia volatilization were determined at different periods (5 , 12 , 27 , 39 and 53 day) after urea applications.

The results showed a significant degradation of urea fertilizer by ammonia volatilization in studied soils, a high quantity and rate of volatilization appeared in sand loam >clay loam > clay texture.

The results showed a high degradation of urea fertilizer appeared in the first period of incubation followed gradual decrease in amount and velocity of volatilization.

an increasing the rate of fertilizers caused a significant effection on fertilizer degradation in the three studied textures.