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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

View larger version (30K): [in a new window]   Fig. 1. Schematic diagrams of modifications made to the incubated soil core–ion exchange resin bag technique of DiStefano and Gholz (1986) that were used in (A) 1995, (B) 1996, (C) 1997 and 1998, and (D) the minilysimeter method used in 2000. Diagrams not drawn to scale. (Dimensions are given in Materials and Methods.)

View larger version (42K): [in a new window]   Fig. 2. Nitrogen mineralization rates and technique comparison conducted between 3 May and 5 June 2000 for the N-fertilized and N-unfertilized, chisel-plowed (CP), and no-tillage (NT) corn treatments. Asterisks denote significant differences (** = p < 0.05 and *** = p < 0.001) in N mineralization estimates from the same method [i.e., incubated soil core–ion exchange resin bag (ISC–IERB) or minilysimeter] between N-fertilized and N-unfertilized treatments. Least significant differences ( = 0.05 level) between methods were 12.5 and 20.3 kg N ha-1 mo-1 for the N-unfertilized (p = 0.114) and N-fertilized (p = 0.521) CP treatments, respectively.