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Nmin method

Nmin method (GB)
Method for the determination of the mineral content available to the plants nitrogen in the ground, This is called (in contrast organically bound nitrogen Norg) as Nmin. The organically bound nitrogen is not yet plant available and is only through microorganisms gradually transformed into plant-available nitrogen during the growing season. At the beginning of the vegetation, however, nitrogen is already needed. In the classical Nmin method, at the beginning of the vegetation, the amount present in the root area in the form of ammonium and nitrates up to a depth of 90 centimeters is determined in three layers of 30 centimeters each. The target value refers to the amount that must be present in the intensely rootable soil profile at the start of vegetation and a fertilization is not required. He is still controversial and is about 80 to 100 kilograms Nmin / ha. In the case of a deficit, mineral (ie not organic) must be fertilized. The classical method is based on the determination of nominal values ​​in field trials and requires a high testing and calibration effort. Therefore, the modified Nmin method is increasingly used. It is based primarily on estimates and is much easier to perform. See also below EUF method,

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