Influence of mononitrogen fertilizer system on biochemical status of Luvisol sandy loam soil with high contents of phosphorus and potassium
The effect of mononitrogen fertilizer system on biochemical status of high fertility Luvisol sandy loam soil was studied during five years in the field experiment. Data interpretation of enzyme diagnostics was done based on the resulting estimation criteria, which is a biochemical coefficient including four key enzymatic parameters and representing the ratio of average speeds of humification and mineralization activities in С and N cycles. Five-year application of mono nitrogen fertilizer system resulted in progressive increase of organic substances mineralization, which enhanced with nitrogen dose rising. It is ecologically advisable to fertilize the soil with the complete mineral fertilizer with the minimal doses of phosphorus and potassium. Thus, humification and mineralization processes are balanced and organic matter is saved.