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.

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Kalembasa S. , Kalembasa D. 2002. IMPACT OF NITROGEN (¹⁵ N) APPLICATION TIME ON ITS UPTAKE AND DISTRIBUTION IN SPRING BARLEY PLANT PARTS, EJPAU 5(2), #2.
Available Online: http://www.ejpau.media.pl/volume5/issue2/agronomy/abs-2.html

ABSTRACT

The aim of the pot experiment was to determine the impact of timing of nitrogen application in the form of ammonium nitrate enriched with the ¹⁵N isotope, on the uptake of ¹⁵N by spring barley plant and its distribution in grain, awns, leaves, straw, and roots. 1.21 g of N per pot containing 10 kg of the soil was applied at two doses: 2/3 before the sowing, and 1/3 at the tillering phase or at the stalk-shooting phase. The distribution of the applied nitrogen, assumed as 100%, was the highest in grain (61.5%), and the lowest in roots (4%). The mean nitrogen utilisation coefficient value (%) measured with the difference method was 86.9 %, and that for the isotope dilution method – 61.0%. Postponing the time of nitrogen application from the tillering to the stalk-shooting phase differentiated the nitrogen utilisation coefficient value, which was higher for the difference method than for the isotope dilution method and it amounted to +32.3% at the tillering pha

Key words: the ¹⁵N isotope, application timing, uptake and distribution of N in a plant, spring barley.

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