2024, Vol. 7, Issue 9, Part K

author(s)
Mohammad Nasim A, Mallikarjuna Gowda AP, Manjunath B and Sajidullah Safi

abstract
Field experiment was conducted at the Zonal Agricultural Research Station, University of Agricultural Sciences, G.K.V.K, Bangalore, during Rabi 2022-23 and Kharif 2023 to evaluate the impact of bio-stimulants on biomass production, nutrient content and uptake in potato (Solanum tuberosum L.). The study comprised a randomized complete block design (RCBD) with eight treatments, including soil application of humic acid, amino acid, seaweed extract, and microbial consortia-based bio-stimulants and replicated three times. Results indicated that, the treatment combination of whole tubers + RDF + Humic acid @ 2 ml L^-1 recorded significantly maximum fresh biomass yield (884.75 and 930.28 g plant^-1) and dry biomass yield (151.30 and 159.56 g plant^-1) during Rabi and Kharif, respectively. Similarly, during Rabi season, maximum nitrogen content (1.60%, 1.84% & 1.27%), phosphorus content (0.97%, 0.16% & 1.11%) and potassium content (2.08%, 1.89% & 3.33%), respectively was recorded in leaves, stems and tubers. During Kharif season, maximum nitrogen content (1.63%, 1.85% & 1.30%), phosphorus content (0.68%, 0.18% & 1.12%) and potassium content (2.12%, 1.92% & 3.38%), respectively was found in leaves, stems and tubers. Same treatment combination resulted in maximum nitrogen uptake (28.84, 41.31 & 71.42 kg ha^-1), phosphorus uptake (17.95, 3.66, & 62.44 kg ha^-1) and potassium uptake (37.65, 42.42 & 186.37 kg ha^-1), respectively found in leaves, stems and tubers during Rabi season. At the similar manner, higher nitrogen uptake (32.86, 42.67 & 76.03 kg ha^-1), phosphorus uptake (13.68, 4.22, & 65.87 kg ha^-1) and potassium uptake (42.56, 44.28 & 198.24 kg ha^-1), respectively by leaves, stems and tubers was recorded during Kharif season. Whereas, lower biomass production, nutrient content and uptake were found in control.