The seed yield in sunflower is influenced by the genetic potential of the hybrid and it’s interaction with the environmental and technological factors. The study was performed using a split-split plot design with three replications, having density as main, fertilization as second and tillage as third factor. As experimental material was used the sunflower hybrid NK Neoma. The used sowing densities were: 70 x 29 cm, resulting 49261 germinating kernels (g.k.) ha-1; 70 x 26.5 cm, resulting 53908 g.k.ha-1; 70 x 24 cm, resulting 59524 g.k.ha-1; 70 x 21.4 cm, resulting 66756 g.k.ha-1. In order to provide the fertilization treatments, were applied combined fertilizers using doses of 250 kg ha -1 (20-20-0) for N50P50K0 and 333 kg ha -1 for N50P50K50. The three applied tillage were: ploughing, scarification and scarification+ ploughing. The aim of this research was to analyse the main effect and interactions between different technological factors like population density, fertilization and tillage on the sunflower yield, under the conditions from Timisoara. The applied fertilization had a contribution of 78.55% to yield variability, significantly higher compared to density and tillage influences. The increasing of density by reduction of space between plants from 29 to 24 or 21.4 cm has a positive effect to sunflower yield. The application of different treatments with NPK has led to significant yield increases of 45-46% compared to unfertilized plot. It is also noted that on the background of fertilization with N50P50 the application of 50 kg potassium had a very small and insignificant effect to yield. On the background of the climatic conditions from the studied period the applied tillage did not significantly influence the sunflower yield.

sunflower, density, fertilization, tillage, yields

field crops and pastures

Presentation: oral