info:oai:icrisat:6777info:ofi/fmt:xml:xsd:journalYoneyamaTYoneyama, TEngelaarW M H GEngelaar, W M H GKimH YKim, H YRupelaO PRupela, O Pδ15N values of sorghum grains harvested on a Vertisol in the semi-arid tropics were positively related to doses of fertilizer N but negatively with the frequency of legume cultivationSoil Science and Plant Nutrition0038-0768200147423-4272article