Nitrogen mineralization, plant uptake and nitrate leaching following the incorporation of (15N)-labeled cauliflower crop residues (Brassica oleracea) into the soil: a 3-year lysimeter study

Abstract : A 3-year field lysimeter experiment was performed to determine transformations of 15N-labeled cauliflower (Brassica oleracea) residues incorporated into lysimeter topsoil in a potato (Solanum tuberosum)/cauliflower rotation. Only the potato crop received 150 kg mineral N ha(-1)y(-1). Cauliflower yields were high (12-13 t fresh matter ha(-1)), and N returned to the soil represented 51% of the aboveground plant N uptake. The 15N recovery by the potato/cauliflower rotation began at 46%, then decreased sharply to 12 and 6% for the second and third year, respectively. The cumulative 15N leaching rate was only 3%; 63% remained in the soil 3 years after incorporation. Soil N mineralization rates described by a parallel first-order kinetic model predicted 27, 7 and 6% of residual N lost annually during the first, second and third year, respectively. Thus, a potato/cauliflower rotation with moderate N fertilization optimizes N recovery of crop residues and can control leaching loss efficiently.
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Submitted on : Tuesday, February 7, 2017 - 8:21:48 PM
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Nouraya Akkal-Corfini, Thierry Morvan, Safya Menasseri-Aubry, Christine Bissuel, Dominique Poulain, et al.. Nitrogen mineralization, plant uptake and nitrate leaching following the incorporation of (15N)-labeled cauliflower crop residues (Brassica oleracea) into the soil: a 3-year lysimeter study. Plant and Soil, Springer Verlag, 2010, 328 (1/2), pp.17-26. ⟨10.1007/s11104-009-0104-0⟩. ⟨hal-01460928⟩

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