Abstract
Salt-affected soils in semiarid regions impede the agricultural productivity and degrade the ecosystem health. In South India, several hectares of land are salt-affected, where the evapotranspiration exceeds the annual precipitation. This study is an attempt to ameliorate sodic soils, by an experiment involving chemical treatment (addition of gypsum), organic amendments (decomposed bagasse pith and green manuring with Sesbania rostrata) and phytoremediation by plantation of Eucalyptus camaldulensis. The prime focus is to minimize the use of gypsum and improve the soil health in terms of nutrients, microbial population and enzyme activity in addition to sodicity reclamation. At the end of the third year, a reduction of 10 % in soil pH, 33 % in electrical conductivity and 20 % in exchangeable sodium percentage was achieved compared to the initial values. Three- to fourfold increases in organic carbon content were observed. Significant improvement in the available major and micronutrients of soil, microbial growth and enzyme activity was observed, suggesting phytoremediation by E. camaldulensis as a sustainable option for restoration of similar kind of degraded lands.
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Seenivasan, R., Prasath, V. & Mohanraj, R. Restoration of sodic soils involving chemical and biological amendments and phytoremediation by Eucalyptus camaldulensis in a semiarid region. Environ Geochem Health 37, 575–586 (2015). https://doi.org/10.1007/s10653-014-9674-8
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DOI: https://doi.org/10.1007/s10653-014-9674-8