Abstract
The effects of 18 years continuous cropping of irrigated rice on soil and yields were studied in two long-term fertility experiments (LTFE) at Ndiaye and Fanaye in the Senegal River Valley (West Africa). Rice was planted twice in a year during the hot dry season (HDS) and wet season (WS) with different fertilizer treatments. Soil organic carbon (SOC) under fallow varied from 7.1 g kg−1 at Fanaye to 11.0 g kg−1 at Ndiaye. Rice cropping maintained and increased SOC at Ndiaye and Fanaye, respectively and fertilizer treatments did not affect SOC. Soil available P and exchangeable K were maintained or increased with long-term application of NPK fertilizers. Without any fertilizer, yields decreased by 60 kg ha−1 (1.5%) and 115 kg ha−1 (3%) per year at Fanaye and Ndiaye, respectively. The highest annual yield decreases of 268 kg ha−1 (3.6%) and 277 kg ha−1 (4.1%) were observed at Fanaye and Ndiaye, respectively when only N fertilizer was applied. Rice yields were only maintained with NPK fertilizers supplying at least 60 kg N, 26 kg P and 50 kg K ha−1. It was concluded that the double cropping of irrigated rice does not decrease SOC and the application of the recommended doses of NPK fertilizer maintained rice yields for 18 years.
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Bado, B.V., Aw, A. & Ndiaye, M. Long-term effect of continuous cropping of irrigated rice on soil and yield trends in the Sahel of West Africa. Nutr Cycl Agroecosyst 88, 133–141 (2010). https://doi.org/10.1007/s10705-010-9355-7
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DOI: https://doi.org/10.1007/s10705-010-9355-7