Determination of phosphorus (Vanadonolybdate yellow color) aliquot of the pipette from the sample digestion plants, 3 ml in 3 ml of distilled water to the test tube fill 5% of ammonium metavanadate ammonium molybdate and 0.25% for each 1-ml shake and then leave it on for 20 min and then measure the intensity of the yellow color occurs with a spectrophotometer at 440 nm wavelength.
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