Abstract
A field study was conducted in arid-Saharan Morocco to assess the fate of fertilizer N in a wheat (Triticum durum var. Karim)–wheat cropping sequence. Therefore, 85 kg N ha−1 labeled with 9.764 atom % excess 15N was applied in a three-split application. The fertilizer N recovery by the wheat in the first year was 33.1%. At harvest, 64.8% of fertilizer N was found in the 0–80 cm profile as residual fertilizer-derived N. 2.1% of the applied N could not be accounted for in the season 1996/1997. The recovery of the residual labeled fertilizer N by the subsequent wheat crop was 6.4% for the treatment without residue incorporation and 7.4% for the treatment with residue incorporation. The possible reason for this low plant recovery was immobilization of the fertilizer N. The total recovery of fertilizer N over the two growing seasons was 82.3% and 86.1% for the treatment without and with residue incorporation, respectively. The not recovered N after the second cropping season was 15.6% and 11.8% for the treatment without and with residue incorporation, respectively. The loss of labeled N by the soil–plant system was not due to leaching but to denitrification and volatilization. In the treatment (N+*R) with labeled residue incorporation, the percentage of N recovery by plant was 16.2, indicating the mineralisation of the residue applied.
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Ichir, L., Ismaili, M. & Hofman, G. Recovery of 15N labeled wheat residue and residual effects of N fertilization in a wheat–wheat cropping system under Mediterranean conditions. Nutrient Cycling in Agroecosystems 66, 201–207 (2003). https://doi.org/10.1023/A:1023976600760
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DOI: https://doi.org/10.1023/A:1023976600760