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Nitrogen-15 Recovery in Soil Incubated with Potassium Nitrate and Clover Residues

^a Kenya Agricultural Research Inst., P.O. Box 57811, Nairobi, Kenya
^b Dep. of Soil Science, North Carolina State University, Raleigh, NC 27695-7619

View larger version (34K): [in a new window]   Fig. 1. Soil inorganic N accumulation following addition of 50 mg kg-1 fertilizer and clover residue. Recovery of applied N in clover was determined by the difference () and by the 15N dilution methods ().

View larger version (20K): [in a new window]   Fig. 2. Soil plus clover inorganic N accumulation from addition of clover during the first 10 wk of the study.

View larger version (29K): [in a new window]   Fig. 3. Effect of treatments on native soil inorganic N. Significant differences indicated with LSD0.05 bar.

View larger version (26K): [in a new window]   Fig. 4. Soil organic N recovery of applied N after addition of 50 mg kg-1 clover residue and fertilizer.

View larger version (28K): [in a new window]   Fig. 5. Changes in microbial biomass N after additions of clover residue and fertilizer.