Abstract
Abstract The introduction of plant materials into a soil can impact the nitrogen (N) status and the fertilizer requirement for agronomic crop production. Consequently, an accurate estimate of N mineralization from soil organic matter and incorporated plant material is necessary to adequately make a N fertilizer recommendation. The purpose of this study was to evaluate the effect of plant parameters including type, size, incorporation rate, and time after incorporation on N mineralization and to derive localized values for parameters in a widely used potential N mineralization model. Soil from the Ap horizon of a Latahco silt loam was amended with alfalfa (Medicago saliva L.), spring pea (Pisum sativum L.), and winter wheat (Triticum aestivum L.) plant materials sized to either 2 mm at rates of 0, 2, 4, and 6%. The soils were incubated at 35°C for 20 weeks. The inorganic N in soils was removed by leaching with 100 mL 0.001M CaCl2 in 5‐ to 10‐mL intervals followed by 25 mL of a nutrient solu...
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