Effect of peanut shells amendment on soil properties and growth of seedlings of Senegalia senegal (L.) Britton, Vachellia seyal (Delile) P. Hurter, and Prosopis juliflora (Swartz) DC in salt-affected soils
The soil amendment with peanut shells (4, 6 or 8 t ha −1 ) improves soil properties and growth of Senegalia senegal (L.) Britton , Vachellia seyal ( Delile) P . Hurter and Prosopis juliflora (Swartz) DC seedlings on salty soils (86, 171, 257 mM NaCl).
Salinization causes the degradation of biological, chemical, and physical properties of soils. Salty soils reclamation can be achieved with organic amendments and afforestation with salt tolerant species.
The aim of the study was to assess in greenhouse conditions the effect of peanut shells on soil chemical characteristics and growth of multipurpose leguminous trees Senegalia senegal, Vachellia seyal, and Prosopis juliflora under salt-affected soils.
Seedlings were individually cultivated in plastic bags containing a mixture of non-saline and non-sterile soil and crushed peanut shells. Four doses of peanut shells (0, 4, 6, and 8 t ha−1) of 73-33 variety were tested. Salt stress was gradually applied after 1 month of cultivation at a rate of 43 mM NaCl per day until concentrations of 0, 86, 171, and 257 mM were reached. Seedlings growth, physiological responses, and soil characteristics were evaluated after 3 months of stress.
Peanut shells application improved soil chemical properties (carbon, nitrogen, phosphorus contents, pH, total microbial activity, and cation-exchange capacity) and reduced soil salinity. They also increased height, collar diameter, shoots and root biomass, chlorophyll, and proline contents of seedlings.
The organic amendment with peanut shells improves soil fertility and tree growth under saline conditions.
KeywordsOrganic amendment Salinization Saline soil reclamation Senegalia Senegal Vachellia seyal Prosopis juliflora
The authors acknowledge FIRST, LMI-LAPSE, and IFS for their financial support. The authors thank all the CNRF and LCM lab technicians for their technical assistance and Dr. Moussa DIENG (Michigan State University, USA) for the English revision and Dr. Mamadou CISS (ISRA/DG) for statistical analysis.
This work was funded by the “Fonds d’Impulsion de la Recherche Scientifique et Technologique (FIRST)” of the Ministry of Higher Education and Research of Senegal, the Laboratoire Mixte International “ Adaptation des Plantes et microorganismes associés aux Stress Environnementaux” (LMI-LAPSE), and the International Foundation for Science (IFS).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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