nitrogen
Nitrogen fertilisers and nitrogen management – urea, ammonium sulphate, calcium ammonium nitrate, rates and losses.
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Reading an NPK Ratio: Matching Fertiliser to Your Soil Test
The three numbers on a fertiliser bag are percentages by weight of nitrogen, phosphorus (as P2O5) and potassium (as K2O). A 20-10-10 blend is 20% nitrogen, 10% phosphorus and 10% potassium; the remaining 60% is carrier, sulphur, trace…