Author(s)

Marie Claver Ndébane Ngom^1,2, Pape Ibrahima Djighaly^1,2,3,4, Nathalie Diagne^1,3*, Maty Ndour^1,2, Ganna Ndong¹, Daouda Ngom⁵, Mariama Ngom^3,4,5, Saliou Ngom⁶, Sergio Svistoonoff^4,7

¹Centre National de Recherches Agronomiques (ISRA/CNRA), Bambey, Sénégal.
²Département d’Agroforesterie, Université Assane Seck de Ziguinchor, Ziguinchor, Sénégal.
³Laboratoire Commun de Microbiologie LCM: (IRD/ISRA/UCAD), Centre de Recherche de Bel Air, Dakar, Sénégal.
⁴Laboratoire Mixte International Adaptation des Plantes et Microorganismes Associés aux Stress Environnementaux (LAPSE), Centre de Recherche de Bel Air, Dakar, Sénégal.
⁵Département de Biologie Végétale, Université Cheikh Anta Diop de Dakar, Dakar, Sénégal.
⁶Centre pour le Développement de l’Horticulture (ISRA/CDH), Cambérène, Dakar, Sénégal.
⁷Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM), Université de Montpellier, CIRAD, INRAE, IRD, Institut Agro, Campus International De Baillarguet, Montpellier, France.

Soil salinization is one of the major causes of land degradation. In Senegal, this phenomenon continues to grow, making soils unsuitable for agriculture. To rehabilitate salty lands, one of the recommended strategies is the use of salt-tolerant plants. Among them, plants of Casuarinaceae family form a relationship with symbiotic microorganisms such as arbuscular mycorrhizal fungi and nitrogen fixing bacteria. It has been shown that symbiotic microorganisms play an important role in the establishment of tolerant plants in saline conditions (Djighaly et al., 2018). They improve plant performance and reduce transplant shock under salt stress conditions (Diagne et al., 2014). These microorganisms can be used as biofertilizers. However, inocula containing symbiotic microorganisms are either too expensive or unavailable in many developing countries. The aim of this study is to test alternatively affordable and low-tech solutions to promote symbiotic interactions such as Casuarina crushed nodule, Casuarina rhizosphere soil and Casuarina leaves compost that may contain symbiotic microorganisms and also nutrients such as N and phosphorus. Two species of Casuarina (Casuarina equisetifolia L. and Casuarina obesa Miq.) were grown in the greenhouse on sterile soil to which an amendment was added (Casuarina crushed nodules, Casuarina Rhizospheric soil or Casuarina leaves compost). Plants were subjected to saline stress. After four months of cultivation, they were harvested and morphological and physiological parameters were determined. Results showed that inoculation with Casuarina crushed nodules, Casuarina rhizospheric soil and Casuarina leaves compost improved growth, total dry biomass, total chlorophyll and proline contents of C. equisetifolia and C. obesa plants in salt stress condition. These positive effects were more important in C. obesa plants amended with Casuarina leaves compost. This study shows that Casuarina leaves compost can play an important role in the rehabilitation of saline soils by improving Casuarina trees performance in saline conditions.

Frugal Innovation, Rehabilitation of Salty Lands, Casuarina, Compost, Crushed Nodules, Rhizospheric Soil

Ngom, M. , Djighaly, P. , Diagne, N. , Ndour, M. , Ndong, G. , Ngom, D. , Ngom, M. , Ngom, S. and Svistoonoff, S. (2020) Effect of Casuarina Crushed Nodules, Rhizospheric Soil and Leaves Compost on Salt Tolerance of Casuarina equisetifolia L. and Casuarina obesa Miq.. Open Journal of Soil Science, 10, 359-373. doi: 10.4236/ojss.2020.109019.