Soil fertility dynamics in the groundnut-maize cropping system under integrated nutrient management

A field experiment was conducted on “Integrated Nutrient Management in Groundnut (Arachis hypogaea L.)- Maize (Zea mays L.) Cropping System” during two consecutive years (2015-2016 and 2016-2017) at the Agricultural Research Station, Vizianagaram of Acharya N.G. Ranga Agricultural University (ANGRAU), in the North - Coastal Agro-Climatic Zone of Andhra Pradesh, to study the effect of integrated nitrogen management practices on growth, nutrient dynamics and yield of kharif groundnut and succeeding rabi maize. Among all the RDF along with bio-fertilizers application, maximum values for vegetative parameters, nutrient uptake and organic carbon content, available N, P & K were recorded with the application of 150% RDF + FYM 5 t ha-1 and the higher pod yield and yield attributes were recorded with 125% RDF + FYM 5 t ha-1 which was, however, comparable with with100% RDF + FYM 5 t ha-1. The research results of succeeding maize revealed that, growth parameters, yield attributes, yield, nutrient uptake and organic carbon content, available N, P & K were significantly influenced by the treatments given to preceding groundnut crop in the sequence. Among all the treatments, the dry matter production, yield attributes, yield, nutrient uptake and organic carbon content, available N, P & K maximum recorded with the treatment combination of 100%RDF+ Azospirillum+ PSB+ VAM+ with groundnut crop residue incorporation which was, however, comparable to combinations RDF125+FYM5t+ Rhizobium inoculation +PSB+VAM and RDF100+FYM5t+ Rhizobium inoculation +PSB+VAM.