When applying fertilizers through the irrigation water (fertigation), it is essential to be familiar with some important facts regarding fertilizers solubility.
Solubility of a fertilizer - The solubility of a fertilizer is defiend as the maximal amount of the fertilizer, that can be completely dissolved in a given amount of distilled water at a given temperature.
Manufacturers may provide you with solubility data of their fertilizers upon request. Here is an example of solubility data of various fertilizers (expressed in g/liter):
Solubility g/l | ||||||
Fertilizer / Temperature (C˚) | 5 | 10 | 20 | 25 | 30 | 40 |
Potassium nitrate | 133 | 170 | 209 | 316 | 370 | 458 |
Ammonium nitrate | 1183 | 1510 | 1920 | . | . | . |
Ammonium sulfate | 710 | 730 | 750 | . | . | . |
Calcium nitrate | 1020 | 1130 | 1290 | . | . | . |
Magnesium Nitrate | 680 | 690 | 710 | 720 | . | . |
MAP (Mono Ammonium Phosphate) | 250 | 295 | 374 | 410 | 464 | 567 |
MKP (Mono Potassium Phosphate) | 110 | 180 | 230 | 250 | 300 | 340 |
Potassium chloride | 229 | 238 | 255 | 264 | 275 | . |
Potassium sulfate | 80 | 90 | 111 | 120 | . | . |
Urea | 780 | 850 | 1060 | 1200 | . | . |
Different manufacturers may provide slightly different solubility data for the same fertilizer. This is because they use different additives in their products. There are also some fertilizers that may contain insoluble residues.
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