Photosynthetic radiation use efficiency of different oat cultivars under differentiated nitrogen fertilization
2008
Piotrowska, W., Warsaw Univ. of Life Sciences (Poland). Faculty of Agriculture and Biology. Department of Plant Physiology | Pietkiewicz, S., Warsaw Univ. of Life Sciences (Poland). Faculty of Agriculture and Biology. Department of Plant Physiology | Wyszynski, Z., Warsaw Univ. of Life Sciences (Poland). Faculty of Agriculture and Biology. Department of Agronomy | Michalska, B., Warsaw Univ. of Life Sciences (Poland). Faculty of Agriculture and Biology. Department of Agronomy
In a field experiment conducted with two oat's morphotypes (hulled and naked), fertilized with differentiated nitrogen rates (0, 30, 60, 90 and 120 kg N haE-1 the biomass production of plants in canopy was evaluated using indices of energetic analysis, coefficient of radiation use efficiency (RUE) by the plants in the canopy among others. It was found the hulled oat's morphotype characterizes with bigger degree of transformation radiant energy into biomass as compared to the naked one (on average for whole experiment the energy yield for cv). Chwat was 15.0 while fot cv. Akt 13.6 MJ mE-2. Maximum transformation of radiant energy into biomass was found for traditional morphotype at 90 kg N haE-1, while for naked one already at 30 kg N haE-1, (respectively). Radiation use efficiency (RUE) for grain production was bigger in cv. Chwat as compared to cv. Akt, being 2.77 and 1.49 g d.m. MJE-1, respectively. RUE for biomass production also was bigger in hulled morphotype, being 3.36 vs 3.20 g d.m. MJE-1 in naked one. The rate 90 kg N haE-1 for cv. Chwat and 30 kg N-haE-1 for cv. Akt seem to be physiologically optimal.
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