A method for the calibration of inputs to agronomic crops of phosphoric fertilizers comprising a Mitscherlichian response curve describing the diazotrophic activity of the nitrogen flora in arable soil in proximity to recently buried soil crop residues, and a method of phosphoric fertilization comprising the application of a dose of phosphorus pP and calibrated directly audit crop residues, preferably in combination with an azotobacterial inoculum.
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