تأثير درجات الحرارة و فترات الحضن في تفاعلات أنواع مختلفة من أسمدة اليوريا البطيئة التحلل المضافة إلى ترب كلسية

Abstract EN

Laboratory experiment studies were conducted to compare the hydrolysis and ammonia volatilization for four nitrogen fertilizers containing urea ( Urea; Sulpher coated urea ; Urea phosphate and Polymer coated Urea ) applied to two different textured soils.

Inorganic released nitrogen ( NO3- + NH4+ ) after 40 days incubation at 25 and 35 C were calculated.

Ammonia volatilization was calculated daily for 40 days after incubation at 35 C.

Results indicate that urea fertilizer treatment released the highest amount of inorganic _ N and NH3_ volatilization in the both studied soils and two temperatures.

While the polymer coated urea gave the least significant inorganic_N and NH3_ volatilization as compared with other treatments.

In addition, the temperature 35 C reduced ammonium _ release from all the studied fertilizers as compared with 25 C.

Generally, the ability of the studied fertilizers in reducing inorganic _ N release taking the following arrangement :- U < Up < Us < Upoly.

and their ability in increasing NH3_volatilization as the following arrangement:- U > Up > Us > Upoly.