info:oai:icrisat:7097info:ofi/fmt:xml:xsd:journalChienS HChien, S HHenaoJHenao, JChristiansonC BChristianson, C BBationoABationo, AMokwunyeA UMokwunye, A UAgronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to NigerSoil Science Society of America Journal0361-59951990541772-17776article