Treadwell, F.P. and S.B. Hall Analytical Chemistry. Vol I. 9 th Ed. John Willey& Sons Inc., New York

1 DAFTAR PUSTAKA Barber, S.A Soil Nutrient Availability. A mechanism approach. New York, Wiley. 398p. BKS-PTN Badan Kerjasama Ilmu Tanah Ilmu kesubura...
Author:  Farida Makmur

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