THE INTERRELATIONS BETWEEN THE CAPACITY OF PRODUCTION AND THE COMPONENT ELEMENTS AT THE SUNFLOWER

  • Dorina Bonea University of Craiova, Faculty of Agriculture
  • Viorica Urechean University of Craiova, Faculty of Agriculture
  • Emilia Constantinescu University of Craiova, Faculty of Agriculture
  • Olimpia Pandia University of Craiova, Faculty of Agriculture
Keywords: productivity, correlations, sunflower, component elements

Abstract

The productivity is a complex attribute which expresses, in fact the capacity of the whole organism to produce more in the variable conditions of environment and culture. After Skoric (1992), the final components of the production of seeds are the number of plants on the hectare, the number of seeds on plant, the weight of a thousand of grains and the seeds volume-weight. The height of the plant is not a component of production, but it has a strong effect on the total number of leaves that the plant can forms, influencing indirectly the production. The scope of the present work is the estimation of the main elements of production at the sunflower through the analysis of the correlations. For the set of dozens of hybrids of sunflower analyzed in the comparative culture, in year 2007, at SCDA ?imnic Craiova, the dryness and the heat had a direct effect on the capacity of production, but also on the correlations with its different components. TGW was reduced almost at the half (table 1), comparatively with a normal year, situating around about the value of 40-50 g, but the coefficient of correlation between this and the production (r=0,620) shows that there is a positive tight correlation between the two elements. The values of the VW are not diminished more than a normal year of culture for the sunflower, the limits of this being comprised between 34 and 42 kg. The biometric data concerning the height of the plants shows that for the set of analyzed hybrids, the productively valuable hybrids there are the hybrids with the mean size. Between the height of the plants and the height of the production there was registered a positive correlation (r=0,347). The head diameter varies in terms of the genotype existing a positive strong correlation between this and the production (r=0,623).