Response of nitrogen and phosphorus levels on seed yield parameters of calendula (Calendula officinalis L.) var. Touch of Red Mixture

The experiment was conducted to investigate the effect of nitrogen and phosphorus levels on growth and seed production of calendula. The number of seeds per flower head, number of seeds per plant, seed yield and seed, test weight increased significantly as the quantum of nitrogen was increased from N₀ –N₂. The highest yield was recorded by 32.59 g nitrogen/m² and 50 g phosphorus/m², respectively. The interaction between nitrogen and phosphorus levels showed that maximum yield was recorded with N₂ P₂ (150 kg N/ha + 80 kg P/ha) followed by N₃ P₂ (200 kg N/ha + 80 kg P/ha and least significant effect was shown by N₀ P₀ (control). The treatments N₂ P₂ also showed highest C: B ratio and net returns.