Response of Sweet Pepper (Capsicum annuum) under Varying Fertigation and Irrigation Applications Grown in Naturally Ventilated Greenhouse

The present study was carried out at Punjab Agricultural University's Krishi Vigyan Kendra, Gurdaspur in main crop season during the years 2015–16 and 2016–17. Target yield 3 kg/plant approach was followed and there were three levels of fertigation i.e. F₁: 120 per cent, F₂: 100 per cent and F₃: 80 per cent of targeted dose of fertilizer. The targeted dose was calculated as 3.1 kg/t for nitrogen (N), 0.9 kg/t for phosphorus (P) and 5.3kg/t for potassium (K) element with recovery factor of 1.1 for N, 1.5 for (P₂O₅) and 1.3 for (K₂O). There were three irrigation levels i.e. I₁:100 per cent, I₂: 80 per cent and I₃: 60 per cent replenishment of crop evapotranspiration (ETc). Crop evapotranspiration was calculated on daily basis using Penman-Monteith equation. The study revealed that, there was a significant response of fertigation and irrigation levels on sweet pepper production under greenhouse. Treatment combination F₁I₁performed as the best treatment combination among all combinations and produced average yield as 101.6t/ha by giving targeted dose as 3 kg fruit yield/plant. In yellow coloured sweet pepper, WUE was recorded more in treatment combination F₁I₂ as 8.7 q/ha-cm followed by F₁I₁ and F₁I₃ treatment combination as 8.4 and 7.6 q/ha-cm. The highest FUE was recorded in the treatment combination of F1I1 as 0.69 q/ha-kg of NPK. The lowest FUE was recorded in the treatment combination of F3I3 as 0.41 q/ha-kg of NPK.