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Nitrogen Management

Fate of Nitrogen-15 in a Long-Term Nitrogen Rate Study

I. Interactions with Soil Nitrogen

^a Northern Plains Agric. Res. Lab., 1500 N. Central Ave., Sidney, MT 59270
^b Dep. of Crop Sci., 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801
^c Dep. of Nat. Resour. and Environ. Sci., 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801

^* Corresponding author (bstevens{at}sidney.ars.usda.gov)

Received for publication September 2, 2003. A better understanding of how N management practices affect transformations and movement of fertilizer N may lead to more efficient N management. The objectives of this work were to determine how long-term N fertilizer history in a continuous corn (Zea mays L.) production system affects (i) movement of fertilizer N through the soil profile and (ii) cycling of fertilizer N between available and nonavailable soil forms. Nitrogen-15-labeled ammonium nitrate (¹⁵NH₄¹⁵NO₃) was applied at 0, 67, 134, 201, or 268 kg N ha^–1 to subplots of long-term N rate plots. Twenty to 55% of labeled N was converted into either organic or clay-fixed forms during the first growing season, with the percentage decreasing with increasing N application rate. Significantly more N was released from nonavailable forms in plots where the historical N application rate had exceeded the long-term optimum (186 kg ha^–1) than in plots that received lower rates. Little fertilizer-derived N leached from the profile during the first growing season, but losses did occur during the off-season and subsequent growing season when N application rate was higher than the optimum. It was concluded that a history of excessive N application may decrease response of subsequent crops to fertilizer N due to greater release from nonavailable N forms, most likely as a result of increased mineralization of crop residues and recently formed soil organic N.

Abbreviations: KMI, Kjeldahl nitrogen minus inorganic (nitrogen) • TKN, total Kjeldahl nitrogen

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