Performance of a subsurface drainage system and socioeconomic analysis of coconut production on salt-degraded land under recovery

One of the techniques developed for the reclamation and incorporation of areas affected by salinity and sodicity is the implementation of subsurface drainage systems combinedwith proper irrigation management, aiming to improve production conditions. This research evaluated the hydraulic performance of a subsurface drainage system, soil water transmission properties, soil chemical attributes, and the profitability of dwarf coconut cultivation in a family farming area that has been undergoingsaline-sodic soil reclamation for 13 years. The research was conducted during the 2023 growing season in the Brazilian semi-arid region, within the Curu Pentecoste Irrigation Project, Cear & aacute;. The research results showed that the groundwater flow network highlighted the central region of the area as having higher total potential values, thus functioning as a groundwater divide. The water table drawdown profiles reflect the low water transmission capacityin the soil. The soil chemical attributes indicate that salinity and sodicity levels remain virtually unchangedafter the saline-sodic soil reclamation process. Thewater source used for irrigation poses no risk to the soil or the coconut crop, with the subsurface drainage system playing a vital role in salt removal. The 0.4-hectare pilot area allows the smallholder farmer to reach the level of social reproduction, which is only made possible through financing and the absence of intermediaries in the commercialization process.