info:oai:icrisat:3047info:ofi/fmt:xml:xsd:journalNtareB RNtare, B RBationoABationo, A1573-0867143-147Effects of phosphorus on yield of cowpea cultivars intercropped with pearl millet on Psammentic paleustalf in Niger322Nutrient Cycling in Agroecosystems1992article