ИЗСЛЕДВАНИЯ ВЪРХУ ПОЛСКИТЕ КУЛТУРИ
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ДОБРУДЖАНСКИ ЗЕМЕДЕЛСКИ ИНСТИТУТ
гр. Генерал Тошево
 

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 Пълна версия ORIGINAL PAPER
 
Effect of the plant density and foliar fertilization on the yield from new Bulgarian hybrids of sunflower (Helianthus annuus L.)
  Gencho Milev • Galin Georgiev • Nina Nenova • Penka Peevska  
Dobrudzha Agricultural Institute - General Toshevo, 9521, General Toshevo, Bulgaria
 
     Резюме
 
During 2016–2017 a field experiment was conducted with three new sunflower hybrids (Vilia, Enigma and Linzi) in the trial field of Dobrudzha Agricultural Institute. The aim was to determine the effect of the sowing norm and of a set of foliar fertilizers on the quantitative and qualitative indices of seed yield as a part of determining the elements forming the optimum agronomy practices for growing of the above hybrids. The variants of the experiment were the following: 1) check (untreated); 2) mineral fertilization at norm N60P120K80 (active matter/ha); foliar fertilization with: 3) Root; 4) Siapton; 5. Lebosol B; 6) Aminosol; 7) Aminosol mix; 8) Yara Vita Brassitrel pro. The foliar treatment was done by sprinkling the leaf mass at stage 6-7th pair of leaves. The soil in the experimental field was leached chernozem (Luvic phaeosem) with 3.30% humus content classified as very suitable for sunflower growing. The averaged two-year results for seed yield showed that sunflower hybrid Vilia realized highest seed yield, regardless of the variants of the experiment, followed by hybrids Enigma and Linzi. Depending on the crop density (main action of the factor), hybrid Vilia had a positive response to higher densities, hybrid Enigma was indifferent, while hybrid Linzi decreased its seed yield with the higher crop densities. Depending on the tested variants of macro and micro fertilization (main action of this factor), the results were positive for hybrids Vilia and Enigma, and in hybrid Linzi there was no change in the size of yield. Hybrid Vilia was with the highest 1000 kernel weight, regardless of the tested variants, flowed by Linzi and Enigma. Thousand kernel weigh was influenced much more by the crop density than by the variants of foliar fertilization. The inverse proportional dependence remained the same, namely 1000 kernel weight decreased with the higher crop densities. The foliar fertilization with the tested products, considered a main action of this factor, did not have significant effect on the value of the parameter “1000 kernel weight”. The oil content in the seeds of the hybrids during the investigation was not influenced significantly by the factors involved in this experiment

Key words: Foliar fertilization, Oil content, Sowing norms, Sunflower, Yield.