2024, Vol. 7, Issue 3, Part E

author(s)
Dr. Sneha MA, BK Desai, MR Umesh and Dr. Vikas V Kulkarni

abstract
A field experiment was conducted to study the response of newly developed sunflower hybrids to planting geometry and fertilizer levels. The objective of the study was to find out optimum row spacing and fertilizer rate for new sunflower hybrids of UAS Raichur. Experiment was laid out in split-split plot design with three replications. The treatments consisted of sunflower hybrids RSFH-12-700, RSFH-12-705 and RSFH 1887 as main plots, row Spacings at 60 cm and 75 cm as sub plots and fertilizer rate at 100, 125 and 150% RDF as sub-sub plots. The results revealed that sunflower hybrid RSFH-12-700 has recorded 7.98 and 15.58 percent higher seed yield (2144 kg ha^-1) compared to RSFH-12-705 and RSFH 1887, respectively. The growth, yield attributes viz., dry matter partitioning, total dry matter production, head diameter, seed volume, grain yield, stalk yield and harvest index (HI). Narrow row spacing at 60 cm had significant effect on growth attributes viz. dry matter partitioning, total dry matter production. Whereas, application of 150% RDF has produced significantly higher seed yield (2104 kg ha^-1), growth and yield parameters but on par with 125% RDF and superior over 100 percent RDF. It was concluded that the new sunflower hybrid RSFH-12-700 showed greater growth and yield at optimum plant spacing of 60 cm and 150% recommended dose of fertilizers.