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POTENSI DAN KEMUNGKINAN PENGGUNAAN GUANO SECARA LANGSUNG SEBAGAI PUPUK DI INDONESIA
(Jurnal Tanah dan Lingkungan, DITSL Faperta IPB, 2007)
Guano is a material originally from sea bird or bat excrement. This material is an important source of P fertilizer during nineteenth century and the early part of twentieth century.