Fertilization influences nitrogen dynamics in soils under Dalbergia sissoo |
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Authors: | Z Javid R F Fisher |
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Institution: | (1) Punjab Forestry Research and Training Center, Gatwala-Faisalabad, Pakistan;(2) Department of Forest Resources, Utah State University, 84322-5215 Logan, UT, USA |
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Abstract: | The influence of added ammonium, phosphorus, potassium, and gypsum on net nitrogen mineralization was studied in soil beneath
a six-year-old plantation of the N2-fixing tree Dalbergia sissoo in Pakistan. Soil with and without amendments was placed in polyethylene bags and incubated, buried in the soil, for 30 days.
After that time the soil was analyzed and net ammonium and nitrate production and net nitrogen mineralization were calculated.
The addition of ammonium stimulated nitrification indicating that the process was substrate limited. The inhibition of nitrification
by Nitrapyrin showed that the process is autotrophic in these soils. Gypsum addition lowered soil pH from 8.0 to 7.2 and significantly
stimulated ammonification, nitrification and net nitrogen mineralization. The addition of potassium more than tripled the
soil K:Na ratio. Net ammonium and nitrate production and net nitrogen mineralization all increased in this treatment. The
addition of phosphorus had no significant effect on soil nitrogen dynamics. |
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Keywords: | Dalbergia sissoo fertilization nitrification nitrogen |
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