تقدير نشاط أنزيم اليورييز عند مستويات من سماد اليوريا و أزمنة تحضين مختلفة

الملخص EN

A factorial experiment was conducted in laboratory using complete randomize design (CRD) to study the effect of urea fertilizer levels on urease enzyme activity and available nitrogen in Bashika and Al-hawi soils under different incubation times.

Results showed a significant increases in enzyme activity in Bashika soil as compared with Al-hawi soil of 25.93 %.

100kgN.h-1 gave a significant increasing in enzyme activity as compared with 200 kgN.h-1 of 15 %.

Enzymes activity was increased with increasing incubation time till to 30 days, then after a significant depression in enzyme activity was noticed.

Bashika soil gave a significant increases in available nitrogen as compared with Al-hawi soil of 23.55 %.

200 kgN.h-1 gave a significant increases in available nitrogen as compared with 100 kgN.h-1 of 27.48 %.

Available nitrogen was increased with increasing incubation time till 45 days, which gave 53.34 ppm.

However a significant decreases was noticed at 60 days of incubation.