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Prediction of soil nitrogen supply in potato fields in a cool humid climate

Dessureault-Rompré, J., Zebarth, B.J., Chow, T.L., Burton, D.L., Sharifi, M., Georgallas, A., Porter, G.A., Moreau, G., Leclerc, Y., Arsenault, W.J., Grant, C.A. (2011). Prediction of soil nitrogen supply in potato fields in a cool humid climate, 75(2), 626-637. http://dx.doi.org/10.2136/sssaj2010.0305

Abstract

Th is study evaluated diff erent strategies for use of a simple fi rst-order kinetic model (N min = N 0 [1-e -kt] where N 0 is potentially mineralizable N and k is the mineralization rate constant) to predict growing season soil N supply (SNS) in potato (Solanum tuberosum L.) fields under cool humid climatic conditions. Direct application of the kinetic model for the 0- to 15-cm depth signifi cantly underestimated a field-based measure of plant available soil N supply (PASNS). Modeling strategies that considered the soil mineral N (SMN) present at the start of the growing season, or included a pool of labile mineralizable N (Pool I) not normally considered in determination of N 0, performed better, but still underestimated high values of PASNS. Strategies which included a greater soil depth (0-30 cm), or which assumed that the mineralizable N pool was replenished during the growing season, overestimated PASNS. A strategy which used a higher value of k for Pool I gave the most promising results. Results of this study highlight the importance of considering both SMN and labile mineralizable N pools in predicting SNS, and suggest that it is possible to estimate growing season SNS in humid regions using simple kinetic models. © Soil Science Society of America.

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