The effect of urease and nitrification inhibitors and their mixture on the mineral N content of sandy loam soil after urea application
2001
Yesuf Asen (EARO, Addis Abeba (Ethiopia)) | O. Vancleemput
Urea is the most widely used nitrogen fertilizer source. However, its rapid hydroloysis and subsequent nitrification are two of the major processes responsible for its lower recovery. All means of retard these processes might contribute to improve the efficiency of this fertilizer through increasing crop nitrogen uptake. We investigated the effect of nitrogen (n-butyl) phosphorothioc triamide, decayandiamide and their mixture applied together with urea on soil pH change, ammonium and nitrite + nitrate-nitrogen content of the soil. The experiment was executed in the laboratory at 10 and 20 degree centegrade soil temperature and 3/4 and 5/4 field capacity soil moisture content. The result revealed that the inhibitors lowered the soil aciditification at the beginning of the incubation period as compared to the control treatment. The ammonium-nitrogen content for treatment urea and phosphorotie at the beginning of incubation was significantly lower than the other treatments due to delay of urea hydrolysis. A higher ammonium and lower nitrie + nitrate-nitrogen content was measured from treatment urea and dicayandiamide and urea dicayandiamide and phosphorothie than other treatments as a result of inhibition of nitrification. In general, the higher ammonium and lower nitrite and nitrate content puts treatment urea dicayandiamide and phosphorothie on top of the other treatments as a result of its physical environments (temperature and moisture) dur to degradation and increasing activity of bacteria. The finding is encouraging for further investigation of the promising treatments on actual field conditon.
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