Search Results       Your search for [author]Orongan, Joaquin Contapay. returned 1 record.           Yield response of two sweet potato cultivars to different levels of nitrogen-potassium fertilizer under different management practices. by Orongan, Joaquin Contapay.; 1979. Subject: Sweet potatoes -- Fertilizers and manures; Nitrogen fertilizers; Potassium fertilizers.          Add to Book Cart Relevance: 31.98%