Evaluation of an In Situ Net Soil Nitrogen Mineralization Method in Dryland Agroecosystems

Direct quantitative measurement of soil net N mineralization in agricultural soils under field conditions has not been widely used. A potential method of in situ net N mineralization was investigated in the fallow phase of a 3‐yr no‐till crop rotation at two sites. Undisturbed soil cores (5 by 15 cm) with anion‐ and cation‐exchange resins (Sybron Ionac ASB‐1P and C‐249) at the bottom were incubated in situ. Nitrate‐N plus NH 4 + ‐N extracted...