Vol. 9, Special Issue 11, Part M (2025)

The field experiment entitled “Effect of Spacing and Boron on growth and yield of Sunflower” was conducted during Rabi season of 2025 at Crop Research Farm Department of Agronomy, Naini Agriculture Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj. The soil of experimental plot was sandy loam in texture. nearly neutral in soil reaction (pH 7.3), low in organic carbon (0.60%), available nitrogen (178.48 kg/ha), available phosphorus (41.3 kg/ha) and available potassium (244.6 kg/ha). The experiment was laid out in a Randomized Block Design with ten treatment which are replicated thrice. The treatment combinations are T₁ - Spacing 30 x 30 cm along with Boron 200 ppm, T₂ - Spacing 30 x 30 cm along with Boron 300 ppm, T₃- Spacing 30 x 30 cm along with Boron 400 ppm, T₄- Spacing 45 x 30 cm along with Boron 200 ppm, T₅ - Spacing 45 x 30 cm along with Boron 300 ppm,T₆ - Spacing 45 x 30 cm along with Boron 400 ppm, T₇ - Spacing 60 x 30 cm along with Boron 200 ppm, T₈ - Spacing 60 x 30 cm along with Boron 300 ppm, T₉ Spacing 60 x 30 cm along with Boron 400 ppm, T₁₀ - Control (RDF)-N:P: K -60:45:45 kg/ha. The result showed that the significant and higher Plant height (139.26), Plant dry weight (30.35 g), Number of seeds/capitulum (125.53), Test weight (46.64 g), Seed yield (1440.20 kg/ha), Stover yield (2429.62 kg/ha) were recorded in treatment 7 (Spacing 60 x 30 cm along with Boron 200 ppm), Maximum Gross return (107698.63 ₹/ha), Net return (73658.63 ₹/ha) and B:C ratio (2.16) was also recorded in treatment 7 (Spacing 60 x 30 cm along with Boron 200 ppm).