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<p>The dilution technique and agricultural reuse of solar saltworks effluent represent a novel approach, capable of transforming an industrial byproduct into a source of nutrients, reducing dependence on synthetic fertilizers, lowering production costs, and mitigating the carbon footprint of agricultural cultivation. The objective of this study was to evaluate the sustainable use of solar salt pan effluent in forage sorghum cultivation, correlating soil attributes and plant physiological responses under different dilutions. The experiment was conducted in a randomized block design, in a 5 × 2 factorial arrangement. Factor 1 corresponded to dilutions of the effluent in rainwater (EC 1.5, 3.0, 4.5, and 6.0 dS m⁻<sup>1</sup>), in addition to rainwater as a control. Factor 2 comprised two soil classes: Fluvisol and Ferrasol. Forage sorghum cv. Ponta Negra was grown in 20-L pots and irrigated twice weekly. Soil physical, water, and chemical properties were evaluated by multivariate analysis, while physiological parameters and shoot ionic composition were analyzed by univariate statistics. Effluent dilution promoted sustainable reuse, reducing Na input to the soil and providing K, Ca, and Mg. The soil classes exhibited antagonistic behavior: Fluvisol was associated with chemical fertility attributes, while Ferrasol was associated with physical, water, and degradation properties. Most physiological parameters remained unchanged, with modifications only in stomatal conductance and Mg (Ferrasol) and water use efficiency and K (Fluvisol). The results demonstrate that the dilution technique mitigates osmotic stress, constituting a sustainable strategy for sorghum cultivation in semiarid regions.</p> Graphical Abstract <p></p>

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Agricultural use of water and nutrients from the saline industry effluent in the semi-arid region of potiguar: interrelationships of soil attributes and physiological indices of forage sorghum

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Diego José da Costa Bandeira,
  • Jeane Cruz Portela,
  • Rafael Oliveira Batista,
  • Blake Charles Diniz Marques,
  • Joaquim Emanuel Fernandes Gondim,
  • Jussiara Sonally Jácome Cavalcante,
  • Maria Clara Correia Dias,
  • Antônio Gustavo de Luna Souto,
  • José Francismar de Medeiros,
  • Rodrigo Rafael da Silva,
  • Paulo Jardel Mota,
  • Geisiane Xavier de Matos,
  • Antonio Genilson Rodrigues Araújo,
  • Claudeone Manoel do Nascimento

摘要

The dilution technique and agricultural reuse of solar saltworks effluent represent a novel approach, capable of transforming an industrial byproduct into a source of nutrients, reducing dependence on synthetic fertilizers, lowering production costs, and mitigating the carbon footprint of agricultural cultivation. The objective of this study was to evaluate the sustainable use of solar salt pan effluent in forage sorghum cultivation, correlating soil attributes and plant physiological responses under different dilutions. The experiment was conducted in a randomized block design, in a 5 × 2 factorial arrangement. Factor 1 corresponded to dilutions of the effluent in rainwater (EC 1.5, 3.0, 4.5, and 6.0 dS m⁻1), in addition to rainwater as a control. Factor 2 comprised two soil classes: Fluvisol and Ferrasol. Forage sorghum cv. Ponta Negra was grown in 20-L pots and irrigated twice weekly. Soil physical, water, and chemical properties were evaluated by multivariate analysis, while physiological parameters and shoot ionic composition were analyzed by univariate statistics. Effluent dilution promoted sustainable reuse, reducing Na input to the soil and providing K, Ca, and Mg. The soil classes exhibited antagonistic behavior: Fluvisol was associated with chemical fertility attributes, while Ferrasol was associated with physical, water, and degradation properties. Most physiological parameters remained unchanged, with modifications only in stomatal conductance and Mg (Ferrasol) and water use efficiency and K (Fluvisol). The results demonstrate that the dilution technique mitigates osmotic stress, constituting a sustainable strategy for sorghum cultivation in semiarid regions.

Graphical Abstract