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The values in an NPK fertilizer label are related to the concentrations (by weight) of phosphorus and potassium elements as follows: P 2 O 5 consists of 56.4% elemental oxygen and 43.6% elemental phosphorus by weight. Therefore, the elemental phosphorus percentage of a fertilizer is 0.436 times its P value. K
NPK ratings consist of three numbers separated by dashes (e.g., 10-10-10 or 16-4-8) describing the chemical content of fertilizers. [ 29 ] [ 30 ] The first number represents the percentage of nitrogen in the product; the second number, P 2 O 5 ; the third, K 2 O. Fertilizers do not actually contain P 2 O 5 or K 2 O, but the system is a ...
UAN is a solution of urea and ammonium nitrate in water used as a fertilizer.The combination of urea and ammonium nitrate has an extremely low critical relative humidity (18% at 30 °C) and can therefore only be used in liquid fertilizers.
Many factors motivate the use of CRF, including more efficient use of the fertilizer. Illustrating the problem, it is estimated that, on average, 16% of conventional nitrogen-based fertilizers is lost by evaporation (as NH 3, N 2 O, N 2) or run-off ammonia. [4] [5] Another factor favoring CRT protecting crops from chemical damage (fertiliser ...
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