Fertilizer chemistry

• Main salts

  Ammonium nitrate (34% N), urea (46% N), superphosphate (20% P₂O₅), potassium chloride (60% K₂O).

• Active substance

  Rate in kg/ha is by active substance: 46% urea → 100kg = 46kg N; micronutrients — in grams.

• Compatibility

  Don't mix: urea+lime (N loss), superphosphate+potassium chloride long-term; tank mix — sediment test.

• Forms

  Nitrate — fast, ammonium — longer, amide — via soil; choose by crop and temperature.

Fertilizer math is pure chemistry: salt mass = NPK rate / active fraction × 100. Compatibility is tested in a small tank sample before the field, not in it.