Purushothaman, NSadanandan, NSasidhar, V KNair, K P MKAU2019-08-012019-08-011981Agricultural Research Journal of Kerala, 19(1), 108.http://krishikosh.egranth.ac.in/handle/1/5810118298ennullOptimum and economic levels of phosphorus and potassium fertilisation for groundnut (Arachis Hypogaea L.)Article