Nitrification and Denitrification Potential of soils under Dalbergia sissoo Roxb, ex, DC
Nitrification and Denitrification Potential of soils under Dalbergia sissoo Roxb, ex, DC
R. F. Fisher and Zahid Javid
ABSTRACT
Shisham (Dalbergia sissoo Roxb. ex. DC) is grown under flood irrigation on the
Indus Plain of Pakistan. This dinitrogen fixing tree enriches the soil in nitrogen and
improves the site upon which it is grown. The low C:N ratio, high summer temperatures
and irrigation lead to nitrification rates (7.14 mg NO3--N kg-1 soil 24 days-1). In addition, water logging leads to denitrification rates as high or higher than the nitrification rates.
Consequently irrigation practices that promote anaerobic conditions through water
logging, run the very great risk of removing from the site the nitrogen added through
shisham cropping.
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September 1989
Vol. 39, Iss. 3
