Effect of inorganic and bio-fertilizers on nutrient (NPK) content, nutrient (NPK) uptake and available nutrient (NPK) at harvest of summer groundnut (Arachis hypogaea L.)

A field experiment entitled, “Effect of inorganic and bio-fertilizers on growth, yield and quality of summer groundnut (Arachis hypogaea L.)” was conducted at PG Research Farm, Agronomy Section, R.C.S.M. College of Agriculture, Kolhapur during summer, 2019. The experiment was laid out in factorial randomized block design (FRBD) with three replications and nine treatment combinations of three inorganic fertilizer levels viz., F1- 75% RDF (18.75:37.5:0 kg ha-1), F2- 100% RDF (25:50:0 kg ha-1), F3- 125% RDF (31.25:62.5:0 kg ha-1) and three bio-fertilizers levels viz., B1- Control, B2-Rhizobium spp.+ PSB (Lignite based), B3- Rhizobium spp.+ PSB (Liquid based). The available N, P and K in soil after harvest, nitrogen content (%) and phosphorous content (%) in kernel and haulm, total uptake of nutrients (N, P2O5 and K2O) by groundnut crop and dry pod and haulm yield were recorded higher due to different inorganic fertilizers levels with application of 125% of RDF ha-1 which was comparable with 100% of RDFha-1, significantly over 75% RDF ha-1. The available N, P and K (kg ha-1) in soil after harvest, nitrogen content (%) and phosphorous content (%) in kernel and haulm and total uptake of nutrients (N, P2O5 and K2O) (kg ha-1) by groundnut crop and dry pod and haulm yield were recorded higher due to different bio-fertilizers levels with application of the dual seed inoculation of Rhizobium spp. + PSB (Lignite based) as well as Rhizobium spp. + PSB (Liquid based).