Fertilizer Calculator

Custom Fertilizer Blend & Soil Deficit Calculator

Multi-source N-P-K-S allocation, custom grade tonnage batching, and soil deficit correction

Target N (lb/ac)

Target P₂O₅ (lb/ac)

Target K₂O (lb/ac)

Target S (lb/ac)

Phosphate Source

Nitrogen Source

Potash Source

Field Area

Area Unit

Total Commercial Blend Needed

13,016 lbs

520.6 lbs / acre application rate

DAP (18-46-0) 3,533 lbs 141.3 lbs / ac Credits 25.4 lb N / ac

Urea (46-0-0) 6,227 lbs 249.1 lbs / ac Balances 114.6 lb N / ac

MOP (0-0-60) 3,333 lbs 133.3 lbs / ac Delivers all target K₂O

Sulfur (S) Balance 0.0 lb / ac delivered Deficit: 20.0 lb / ac

Equivalent 50-lb Bag Count 261 Bags Across all components

Desired N %

Desired P₂O₅ %

Desired K₂O %

Total Batch Tonnage

Weight Unit

Target Grade: 19-19-19 Formulation

14.1% Filler

141 kg Sand / Gypsum conditioner needed per ton

Urea (46-0-0) 251.6 kg Supplies net remaining nitrogen

DAP (18-46-0) 413.0 kg Supplies all P₂O₅ + 74.3 kg N

MOP (0-0-60) 316.7 kg Supplies all potassium

Total Active Nutrients 57.0% N + P₂O₅ + K₂O sum

Lab Soil P (ppm) Bray-1 or Mehlich-3

Target Soil P (ppm) Sufficiency baseline

Lab Soil K (ppm) Exchangeable potassium

Target Soil K (ppm) Sufficiency baseline

Correction Timeline

Annual Buildup Requirement

33 lb P₂O₅ / 67 lb K₂O

Applied per acre per year over 3 years

Total Soil P₂O₅ Deficit 99.0 lbs / ac Based on ~9 lb P₂O₅ per 1 ppm soil rise

Total Soil K₂O Deficit 200.0 lbs / ac Based on ~4 lb K₂O per 1 ppm soil rise

Annual DAP Rate for Buildup 71.7 lbs / ac / yr In addition to crop removal

Annual MOP Rate for Buildup 111.1 lbs / ac / yr In addition to crop removal