Dynamics of nitrogen and mineralization pattern in modified Amrashakti

An experiment entitled “Dynamics of nitrogen and Mineralization Pattern in Modified Amrashakti” was undertaken at Department of soil science and agricultural chemistry, Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, Dist. Ratnagiri during 2024-25 in Randomized Block Design. This study aimed to evaluate the nutrient stability and mineralization behaviour of nitrogen fractions (amide nitrogen, ammoniacal nitrogen and nitrate nitrogen) in modified Amrashakti Multinutrient solution during six months of storage. Three solutions viz., T1 @ 0.5% (Urea, SOP, SSP each) + 0.25 % (ZnSO4, Borax, CuSO4 each) + 0.01% (sodium molybdate), T2 @ 0.5% (Urea, SOP, each) + 0.15% (Orthophosphate Phosphoric acid) +0.25 % (ZnSO4, Borax, CuSO4 each) + 0.0075% (Ammonium molybdate) and T3 @ 1% (calcium nitrate) + 0.1% (phosphoric acid) + 0.55% (potassium nitrate) + 0.25% (ZnSO4, Borax, CuSO4 each) + 0.0075% (Ammonium molybdate) with varying pH levels were formulated using different NPK and micronutrient sources. Monthly analysis of nitrogen (amide, ammoniacal, nitrate) by standardised methodology. Based on the mineralization behavior and nutrient fractionation observed over the six-month storage period. Solution T2 consistently outperformed T1 and T3 in terms of nutrient stability, solubility, and availability. T2 maintained higher levels of available nitrogen (through balanced amide to nitrate conversion), Minimal precipitation and better compatibility of nutrient sources in T2 contributed to its superior performance. Decline in amide nitrogen, ammoniacal nitrogen and nitrate nitrogen in solutions were observed in second month. Therefore, it may be concluded that Solution T2 is the most effective formulation among the three, particularly in maintaining nutrient availability and solution stability, and is best recommended for use within two months of preparation for optimal efficiency. Results indicated a decline in pH and EC, accompanied by nutrient losses over time. T2 with acidic pH, showed better nutrient stability and solubility, while T1 recorded greater precipitation and nutrient decline. The findings suggest that the modified Amrashakti Multinutrient solution (T2) i.e., @ 0.5% (Urea, SOP, each) + 0.15% (Orthophosphate Phosphoric acid) +0.25 % (ZnSO4, Borax, CuSO4 each) + 0.0075% (Ammonium molybdate) might be most effective within two months of preparation, beyond which nutrient degradation may impact efficacy.