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| Title | Critical ammonium: nitrate uptake ratios for Douglas-fir determining rhizosphere pH and tree mortality | | Author | Arjan J Gijsman and Meine van Noordwijk | | Editors | R J Wright | | Year | 1991 | | Book Title | Plant-soil interactions at low pH | | Publisher | Kluwer Academic Publishers | | City of Publication | Wageningen, Netherland | | Pages | 181-186 | | Call Number | BC0041-04 | | Keywords | Cytoplasmic acidification, Nitrification, Root growth zones, Soil water content | |