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Denitrification Loss from Two Pennsylvania Floodplain Soils

USDA-ARS Pasture Systems and Watershed Management Research, 117 Research Office Building, University Park, PA 16802.

^* Corresponding author.

ABSTRACT

Denitrification losses and dissolved nitrous oxide concentration within a well- and poorly-drained soil under ryegrass (Lolium perenne L.) were measured for 12 mo. The soils received up to 252 kg N/ha as potassium nitrate in two equal amounts. Denitrification increased in March as the soil warmed to 5 to 7 °C with the highest rates occurring soon after N was applied. Approximately 30% of annual loss occurred within 2 wk of fertilization. Dissolved nitrous oxide concentration peaks corresponded to periods with elevated denitrification. On average, the poorly-drained soil denitrified the equivalent of 40% of applied N (up to 110 kg N/ha). Less than 2.5 kg/ha was denitrified from the well-drained soil. The degree of anoxia in the measurement apparatus substantially effected measured denitrification rates. Consequently, it is important to know the relationship between redox in-situ and in the measurement apparatus.

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