SciELO - Scientific Electronic Library Online

 
vol.27 issue2A study on sugarcane cultures in the Piracicaba region by means of photointerpretation: Part IIElectron microscopy of common and yellow bean mosaic viruses in infected tissues author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Bragantia

Print version ISSN 0006-8705On-line version ISSN 1678-4499

Abstract

VERLENGIA, Flávio  and  GARGANTINI, Hermano. Reduction of digestion time in the determination of total nitrogen in soils. Bragantia [online]. 1968, vol.27, n.2, pp.395-407. ISSN 1678-4499.  http://dx.doi.org/10.1590/S0006-87051968000200014.

By using the Kjeldahl method in the determination of total nitrogen in soils, the effect of various catalysts related with digestion time and with possible nitrogen losses was studied. The experiment was carried out by using the catalysts CuSO4.5H2O; HgO and Se in six treatments. Results indicated that a pronounced reduction on digestion time was obtained by using selenium as catalyst. Best results, however, were obtained by using a mixture of selenium and mercury oxide, principally for soils of very difficult digestion (organic soil and "terra roxa" soil). In all treatments CuSO4.5H2O was the less efficient. Use of selenium did not cause loss of nitrogen.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License