Abstract
Cape Verde, which has agricultural land that is mainly rainfed, will be severely affected by climate change due to increased drought conditions. Scarce water availability makes this country highly dependent on imports for its food supply, resulting in more than 80% food importation. Improving water use efficiency, implementing precision irrigation could help achieve sustainable use of water resources. Cereal production reusing treated water could contribute to strengthening resilience and adaptation to climate change in Cape Verde. Our pilot project demonstrates that the safe and profitable reuse of water produced by Cape Verde’s water treatment plants is possible by avoiding water and plant contact using Subsurface Drip Irrigation (SDI), obtaining food yields between 10,000 and 7000 kg of cob/ha, with a water consumption of about 300 L/kg Dry-Matter and a Water-Use-Efficiency of about 3 g/L. These studies also showed that it is necessary to provide training to farmers and to conduct further studies to help solve present challenges. This project identif installation failures as water shortages can compromise farmers’ profitability. To guarantee the sustainability of water reuse, it is also necessary to consider economic and social factors, including that all water that is not reused is poured, increasing environmental and sanitary risk and decreasing the possibility of recovering water treatment costs.
Highlights
Countries with rain-dependent agriculture will be the most affected by trends in climate change due to drought increases
RCP 2.6 scenario, mentioned the study estimates that median values of 231, 223 and 242 consecutive dry days could be expected in Cape Verde, in 2030, 2050 and 2080, respectively
In spite of the high solid suspended values measured in the treated and sand filtered water (Table 1), due to the proper irrigation system maintenance, no clogging effects were observed in the irrigation system. This result coincides with those previously described by the authors in Reference [17], who avoided clogging in an subsurface drip irrigation (SDI) plot using a secondary effluent from 2002 to 2005, mentioning the importance of SDI maintenance practices
Summary
Countries with rain-dependent agriculture will be the most affected by trends in climate change due to drought increases In this regard, water scarcity is the main factor affecting agriculture and is strongly influenced by weather and climate. Water scarcity is the main factor affecting agriculture and is strongly influenced by weather and climate One of these countries is Cape Verde, which lies in the sub-Saharan African climatic zone and is considered by the World Bank as a lower middle-income country [1]. As described in the Climate Change Knowledge Portal in Cape Verde, the trend towards more consecutive dry days and higher temperatures [4] will increase evaporation and add stress to limited water resources, affecting irrigation and other water uses. RCP 2.6 scenario, mentioned the study estimates that median values of 231, 223 and 242 consecutive dry days could be expected in Cape Verde, in 2030, 2050 and 2080, respectively
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