Rapid determination of EUF-extractable nitrogen and boron
A procedure for the rapid determination of EUF-extractable nitrogen (NH4 +, NO3 - and easily soluble organic N compounds) is described.
In this procedure the EUF-N fractions are oxidized to NO3. The oxidation with peroxodisulfate is accelerated by ultraviolet (UV) radiation. This reduces the time of digestion to about 15 minutes.
The contents of EUF-extractable N are on the average only between 2-8mg/100g soil. Their determination by the new procedure in the form of NO3 is more precise than the results obtained by digestion according to Kjeldahl.
The sum of EUF-extractable N fractions obtained by the new procedure allows to assess the N fertilizer requirements more precisely than is possible when using the EUF-NO3 fractions alone. Therefore this new procedure constitutes a considerable advantage when working out fertilizer recommendations for agricultural practice.
KeywordsEUF-B EUF-NH4 EUF-NO3 EUF-extractable N Rapid determination
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