Search Results       Your search for [author]Duangputra, Piya, 1939- returned 1 record.           Sources and rates od fertilizer phosphorus for flooded rice in Buenavista clay [microform]. by Duangputra, Piya, 1939-; Quezon City: Photoduplication Service. University of the Philippines Library, 1977. Subject: Phosphorus as fertilizers; Soils -- Phosphorus content; Rice -- Fertilizers and manures.          Add to Book Cart Relevance: 31.11%