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vol. 8, nr. 3 (2006)
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Influence of seed laser stimulation on diploid and tetraploid red clover yielding in full performance years
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Mieczysław Wilczek1, Marek Ćwintal1, Barbara Kornas-Czuczwar2, Roman Koper2
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1 Department of Detailed Plant Cultivation, Agricultural University, ul. Akademicka 15, 20-950 Lublin |
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2 Department of Physics, Agricultural University, ul. Akademicka 13, 20-950 Lublin |
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vol. 8 (2006), nr. 3,
pp. 735-743
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abstract:
The field experiment involving red clover (Trifolium pratense L.) was carried out in 2003-2004 by means of randomized blocks in four replications on 20 m2 area plots. Two factors were studied in the experiment: 1. Clover cultivars (Dajana cv. – 2n and Bona cv. – 4n); 2. Pre-sowing seed stimulation with laser radiation with surface power density of divergent beam at the plane of free falling: R0 (with no radiation) and R3 and R6 mW cm-2, applied 1, 3 and 5 times. Shoot density per 1 m2, mean dry matter of a single shoot, as well as annual yields of green and dry matter were evaluated in full performance years. Radiation rates, cuts and cultivars significantly differentiated the clover shoot density per 1 m2. The best results were achieved on object R6x5 for Dajana cv. from the first cut. Average weight of a single shoot significantly decreased in all irradiated objects as compared to the control. The highest yields of green and dry matter were recorded in object R3x5; they significantly exceeded the values for control variants (by 11.5% and 12.2%, respectively). Diploid Dajana clover produced dry matter yield 27.6% higher than that of tetraploid Bona cv.
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keywords:
red clover, full performance year, laser irradiation of seeds, yield
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original in:
Polish
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