Senna siamea trees recycle Ca from a Ca-rich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone

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dc.creatorVanlauwe, Bernard
dc.creatorAihou, K.
dc.creatorTossah, B.K.
dc.creatorDiels, J.
dc.creatorSanginga, Nteranya
dc.creatorMerckx, Roel
dc.date2005-02
dc.date2014-10-02T08:33:13Z
dc.date2014-10-02T08:33:13Z
dc.date.accessioned2026-06-27T15:49:53Z
dc.descriptionThe functioning of trees as a safety-net for capturing nutrients leached beyond the reach of crop roots was evaluated by investigating changes in exchangeable cations (Ca, Mg, and K) and pH in a wide range of medium to long term alley cropping trials in the derived savanna of West Africa, compared to no-tree control plots. Topsoil Ca content, effective cation exchange capacity, and pH were substantially higher under <em>Senna</em> <em>siamea</em> than under <em>Leucaena leucocephala</em>, <em>Gliricidia sepium</em>, or the no-tree control plots in sites with a Bt horizon rich in exchangeable Ca. This was shown to be largely related to the recovery of Ca from the subsoil under <em>Senna</em> trees. The increase of the Ca content of the topsoil under <em>Senna</em> relative to the no-tree control treatment was related to the total amount of dry matter applied since trial establishment. The lack of increase in Ca accumulation under the other species was related to potential recovery of Ca from the topsoil itself and/or substantial Ca leaching. The accumulation of Ca in the topsoil under <em>Senna</em> had a marked effect on the topsoil pH, the latter increasing significantly compared with the <em>Leucaena</em>, <em>Gliridia</em>, and no-tree control treatments. In conclusion, the current work shows that the functioning of the often hypothesized &#39;safety-net&#39; of trees in a cropping system depends on (i) the tree species and on (ii) the presence of a subsoil of suitable quality, i.e., clay enriched and with high Ca saturation.
dc.identifierhttps://hdl.handle.net/10568/44087
dc.identifier.urihttp://hdl.handle.net/123456789/114741
dc.languageen
dc.publisherSpringer
dc.rightsLimited Access
dc.sourceVanlauwe, B., Aihou, K., Tossah, B.K. et al. Senna siamea trees recycle Ca from a Ca-rich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone. Plant Soil 269, 285–296 (2005). https://doi.org/10.1007/s11104-004-0599-3
dc.subjectgliricidia sepium
dc.subjectleucaena leucocephala
dc.subjectsenna siamea
dc.subjecthedges
dc.subjectplant litter
dc.subjectsavannas
dc.subjecttop soil
dc.subjectcalcium
dc.subjectagroforestry
dc.subjectsoil ph
dc.subjectleucaena lecocephala
dc.subjectcerca viva
dc.subjecthojarasca
dc.subjectsabanas
dc.subjectcapa arable del suelo
dc.subjectcalcio
dc.subjectagroforesteria
dc.subjectph del suelo
dc.subjectsubsoil
dc.subjectlitterfall prunings
dc.subjectsubsoil ca content
dc.subjecttopsoil
dc.subjecttrees
dc.subjectbiomass
dc.titleSenna siamea trees recycle Ca from a Ca-rich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)