SUNFLOWER (HELIANTHUS ANNUUS. L.) YIELD-FORMING ELEMENTS INFLUENCED BY YEAR WEATHER CONDITIONS AND APPLICATIONS OF BIOLOGICAL PREPARATIONS TERRA-SORB AND UNICUM

Abstract

The field polyfactorial trials were carried out on experimental fields of the Plant Biology and Ecology Centre, the Faculty of Agrobiology and Food Resources of the Slovak University of Agriculture (SUA) in Nitra Dolná Malanta in two experimental years 2011 and 2012. In experiment was observed the influence of year weather conditions and applications of biological preparations on selected sunflower yield-forming elements: number of plants per unit area, number of heads per unit area, diameter of head, weight of head, weight of thousand achenes (WTA) and finally achenes yield. The results shown the statistically significant influence of year weather conditions on the number of plants and heads per ha and achenes yield but nonsignificant effects on diameter of head, weight and WTA. Higher averages of monitored parameters were observed in 2011. Higher diameter of head value was observed in 2012. The application of biological preparations influenced statistically high significantly number of plants and heads per unit area and achenes yield, statistically inconclusive effect was observed on diameter of head, weight of head and weight of a thousand achenes. The highest number of plants and heads per unit area and also head weight were observed in treatments with Terra-Sorb application. The largest diameter of head was found in treatments with Unicum application, the weight of thousand achenes, and achenes yield was observed in the control variant.