The leaf area index relation to production potential of winter oilseed rape genotypes (Brassica napus subsp. napus) | Vzťah indexu listovej pokryvnosti k produkčnému potenciálu genotypov kapusty repkovej pravej, forma ozimná (Brassica napus subsp. napus)
2009
Hunková, E., Slovenská poľnohospodárska univ. v Nitre (Slovak Republic) | Brestič, M., Slovenská poľnohospodárska univ. v Nitre (Slovak Republic) | Živčák, M., Slovenská poľnohospodárska univ. v Nitre (Slovak Republic) | Malovcová, Ľ., Centrum výskumu rastlinnej výroby, Piešťany (Slovak Republic)
The growth analyses of selected genotypes of winter oilseed rape (Brassica napus subsp. napus) were done. Genotypes were grown in 2007-2008 years on plant experimental station in Borovce (SCAR-RICP Piešťany, western Slovakia, maize grown region, Luvi-Haplic Chernozem, 167 m above sea level). 160 kg N-P-K fertilisers per ha in autumn and 62 kg N per ha in spring were applied under oilseed rape. Genotypes had different provenance: Asgard (Germany), Californium (France), Catalina (France), Magali (France), Manitoba (France), Ontario (Italy), Oponent (Czech Republic), Rodeo (Germany), Rohan (Germany), Talisman (Denmark). Genotype Rohan was hybrid, the other genotypes were line varieties. Growth parameters were calculated using obtained data. The leaf area index (LAI), was evaluated within the context of reached oilseed yields and the whole plants dry mass on area unit. Statistically significant differences among tested genotypes in leaf area per plant, LAI as well as in dry mass, were identified. Correlation analyses show differences in LAI caused by genotypic properties rather than by number of plants per unit of area. Optimum LAI value at the top of vegetation period was about 6 square m per square m. Any deviation from optimal LAI value higher then 1 square m per square m, suggested relevant decrease of yield potential, as predicted by simple model created using measured values. However, such model can be generalised only for line varieties, not for hybrids typically cultivated with decreased number of plants per area.
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