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Seasonal variation in nutrient availability and uptake by oak saplings following four nitrogen treatments on Missouri River floodplain
(University of Missouri--Columbia, 2008)
. Treatments included applying 83 g 20N-10P-10K as slow-release ammonium nitrate, 87 g 19N-6P-9K slow-release urea, interplanting with two nitrogen-fixing false indigo seedlings, or left untreated. After analysis, foliar nitrogen averaged 1.9 percent for pin...