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NOTES & UNIQUE PHENOMENA

Refinements to an In-Situ Soil Core Technique for Measuring Net Nitrogen Mineralization in Moist, Fertilized Agricultural Soil

^a Dep. of Crop, Soil, and Environ. Sci., Univ. of Arkansas, 115 Plant Sci. Bldg., Fayetteville, AR 72701
^b Dep. of Soil Sci., Univ. of Wisconsin, 1525 Observatory Dr., Madison, WI 53706-1299
^c Dep. of Stat. and Dep. of Forest Ecol. and Manage., Univ. of Wisconsin, 1630 Linden Dr., Madison, WI 53706-1598
^d Dep. of Forest Ecol. and Manage., Univ. of Wisconsin, 1630 Linden Dr., Madison, WI 53706-1598

* Corresponding author (kbrye{at}uark.edu)

Received for publication September 24, 2001. Diffusion of NO^-₃–N ions and nonuniform distribution of surface-applied N fertilizers contribute to large variations in field measurements of net N mineralization. An in situ soil core–ion exchange resin bag (ISC–IERB) field method has been used reliably to measure net N mineralization in intact soil cores but has not been widely tested in moist, though nonirrigated, N-fertilized agricultural soils. From 1996 through 2000, net N mineralization was measured in the top 20 cm using a refined version of the ISC/IERB technique for the first 1-mo period following planting and fertilization of N-fertilized and N-unfertilized, no-tillage and chisel-plowed corn (Zea mays L.) agroecosystems on Plano silt loam (fine-silty, mixed, superactive, mesic, typic argiudoll) in south-central Wisconsin. Progressive modifications were made to the ISC/IERB technique, which ultimately resulted in reduced sample variability. Following the refinements, a significant N fertilization effect was shown for the most variable period of the growing season where net N mineralization rates for N-fertilized corn treatments were significantly higher (p < 0.001) than for N-unfertilized corn treatments.

Abbreviations: CP, chisel plowed • ISC–IERB, in situ soil core/ion exchange resin bag • NT, no-tillage

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