Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

Copyright © Wydawnictwo Akademii Rolniczej we Wroclawiu, ISSN 1505-0297

Kalembasa D. 2005. CHARACTERISTICS OF ORGANIC CARBON AND NITROGEN FRACTIONS IN WORTS , EJPAU 8(1/volume8), #01.
Available Online: http://www.ejpau.media.pl/volume8/issue1/volume8/abs-01.html

ABSTRACT

In worts (rye and potato) the total contents of nitrogen and carbon and their fractions were determined for fertilization purposes in agriculture. The rye wort contained more carbon and nitrogen, 442.0 and 32.0 (g.kg^-1), than the potato wort; 340.3 and 28.9. 0.1 mol.dm^-3 of NaOH solution was used for the extraction of humic acids from worts. The carbon extracted by alkaline extract reached 51.0% of its total content in the rye wort and 75.2% in the potato wort. The extracts were acidified to the value of pH 1.5 and got separated into precipitated solid and liquid. The content of carbon in precipitated (solid) phase accounted for 3% of the total carbon in the rye wort and for 19.5% in the potato wort. The precipitated solids were analyzed with the spectrophotometric methods and the results have shown very similar properties as the humic acids extracted from soils. The application of acid hydrolysis allowed for a separation of nitrogen compounds as the following fractions expressed as a percentage of total nitrogen in rye and potato worts were respectively: 1) in non-hydrolysable compounds 88.7 and 87.9; 2) in hydrolysable compounds 11.3 and 12.1. Taking the nitrogen determined in hydrolysable compounds as 100%, the following fractions were separated: a) easily hydrolysable compounds 30.5 and 29.5%; b) not easily hydrolysable compounds 54.0 and 5.5%; c) nitrogen in mineral compounds 15.5 and 65.0%.

Key words: rye and potato worts, fraction of carbon and nitrogen, alkaline and acidic extractions.

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Dorota Kalembasa
Soil Science and Plant Nutrition Department,
Academy of Podlasie, Siedlce, Poland
B. Prusa 14, 08-110 Siedlce, Poland
email: dorka@ap.siedlce.pl

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Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.

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