Sampling and analysis of mineral nitrogen in soil can be done separately for the layers 0-30, 30-60 and 60 to 90 cm. The result of the analysis can be indicated separately as nitrate-N and ammonia-N in kg N per hectare. Apart from the correct timing, sampling and analysing, a correct conversation from concentration to quantity of the nitrogen analysed is relevant (NLWKN, 2007).

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