Formation and reduction of yield elements in winter wheat
1994
Flasarova, M. (Vyzkumny Ustav Obilnarsky, Kromeriz (Czech Republic))
Quantitative analyses of formation and reduction of yield elements in winter wheat cultivars Senta and Vlada, ST 146 line and Vega cultivar were performed at decisive growth stages under the following model conditions: stand density (seeding rates 2.5, 4.0, 5.5 milion germinable seeds/ha); sowing date (first - September 20, second - October 5, third - October 20). The study was aimed at assessing the characteristics of yield element formation, reduction and compensation in different winter wheat genotypes and increased utilization of yield potential by controlling yield elements. Yield element formation was significantly controlled by stand density. At the increasing seeding rate the number of tillers and productive stems per plant reduced; however, the productive density of the stand did not significantly differ at seeding rates investigated. The seeding rate was in negative correlation with both the number of formed florets and actual kernels per spike. Higher kernel number per spike at the seeding rate of 2.5 million germinable seeds/ha increased significantly spike productivity and stand sink, which positively affected grain yield.
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