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Are tillage practices and incorporation of phosphorus fertilizers ways to reduce phosphorus losses caused by preferential flow?
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 161-164 in Preferential Flow, Water Movement and Chemical Transport in the Environment, Proc. 2nd Int. Symp. (3-5 January 2001, Honolulu, Hawaii, USA), eds. D. D. Bosch and K. W. King. St. Joseph, Michigan: ASAE 701P0006.(doi:10.13031/2013.2092)
Authors: Faruk Djodjic, Lars Bergstrm, and Barbro
Keywords: Phosphorus, preferential flow, management practices, no-tillage, fertilizer incorporation
Preferential flow may enhance phosphorus transport through the soil profile and thereby increase the risks for eutrophication of watercourses. The destruction of continuous macropores by tillage and better contact between soil particles and P fertilizer, facilitated by incorporation rather than surface application, should reduce the risks of a rapid P transport from the soil surface to drain tiles. To test these hypotheses, undisturbed soil monoliths (0.295 m in diameter and 1.2 m in length) were collected at a field site with a clay soil for which preferential flow behavior is the dominant solute transport mechanism. After two years of observation, average total P loads reached 1152, 1058 and 566 g ha