Sodification risk mapping of soils in micro watershed in Rio Grande do Sul
Journal Title: Revista Verde de Agroecologia e Desenvolvimento Sustentável - Year 2017, Vol 12, Issue 1
Abstract
Currently, the use of groundwater for irrigation purposes has become a constant in many brazilian watershed. However, the use of water with high sodium content can bring a lot of damage to agricultural soils, especially the clay soils and with poor drainage. The research aimed to evaluate the sodification risk of Lajeado Erval Novo watershed with the introduction of groundwater for irrigation activities. Therefore, was applied a quali-quantitative model to crosscheck the salts concentration information of groundwater from 14 wells located in the region with geomorphological characteristics of the basin. To evaluate the sodium content of groundwater was used the Sodium Adsorption Ratio (SAR) index as an indicator of the percentage of sodium content in water which can be adsorbed by soil. These indicators combined with mapping Geographic Information System (GIS) of slope characteristics and soil type provided an assessment of the risk of soil salinization in different parts of the basin. As a result, it was evidenced the high risk sodification in southern portion using water for irrigation classified with high SAR index (>18) and very high (>26). Studies of this nature aim to contribute to collection information of interest to achievement of more sustainable practices in agriculture, aiming the strategic use of water resources in the region, serving as a contribution to public sector policies.
Authors and Affiliations
Thiago Boeno Patricio Luiz, José Luiz Silvério da Silva, Thomas Schröder, Leônidas Luiz Volcato Descovi Filho
Keywords
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- EP ID EP253384
- DOI 10.18378/rvads.v12i1.4390
- Views 124
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