Abstract
One of the solutions to the problem of water supply in the semiarid region of Pernambuco, Brazil is the use of underground water reserves, however, in a large part of this region this water is improper for consumption, making its desalination necessary. A productive alternative for the use of desalination tailing is the NFT type hydroponics, which, can minimize the adverse effects of this water, thus allowing its use in agriculture. The aim of this study was to evaluate rocket yield under different salinity levels in the NFT hydroponics cultivation using saline underground water and the tailing from its desalination. The investigation was carried out in a greenhouse under the semi-arid conditions of Ibimirim City in Pernambuco State (Brazil). Six levels of water salinity (CEa: 0.2; 1.2; 2.2; 3.2; 4.2; 5.2 dS m -1 ) were studied. Two water salinity sources used in the preparation of the nutritive solution were also evaluated: water artificially salinized with NaCl and brackish groundwater, obtained from a deep tubular well and mixed with its desalination tailing (reverse osmosis). Desalinized water was used to restore the evapotranspiration (ETc) losses. Differences between the salinity sources on rocket growth were not observed. On the other hand, the increase of water salinity produced a negative effect on rocket plants yield and quality. Chlorosis symptoms and burning of leaf edges were observed.
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