Abstract
ABSTRACT This study aimed to evaluate the cultivation of forage sorghum subjected to different leaching fractions with saline effluent from fish-farming under semiarid conditions. The experiment was set in a randomized block design, with four blocks, in split plots, composed of four leaching fractions (0; 5; 10 and 15%) and three forage sorghum varieties ('Volumax', 'F305' and 'Sudão'). Irrigation was performed using saline effluent from fish farming with electrical conductivity of 2.5 dS m-1. The analyzed variables were: plant height; stem diameter; width, length and number of leaves; fresh and dry matter yield, and relative contents of potassium and sodium in the shoots. Forage sorghum under saline effluent irrigation and leaching fraction of 15% shows a yield increase of 25%, in comparison to sorghum without the leaching fraction. The variety 'Volumax' was more sensitive to salinity than the others, since it showed lower shoot growth and low values of leaf area, fresh matter and dry matter.
Highlights
The Brazilian semiarid region is characterized by low rainfall and high evaporative demand; the multiple use of water is an important strategy for the sustainability of water resources
The highest concentrations of salts were observed in the layer of 0-5 cm, with electrical conductivity of the saturation extract (ECe) values of 10.34 and 11.6 dS m-1 for the leaching fractions of 5 and 0%, respectively (Table 3)
Higher values of electrical conductivity in the upper soil layers were observed in the cultivation of beet (Ferreira et al, 2006; Simões et al, 2016) and peanut (Santos et al, 2012) subjected to leaching fractions with saline water
Summary
The Brazilian semiarid region is characterized by low rainfall and high evaporative demand; the multiple use of water is an important strategy for the sustainability of water resources. Some studies conducted with forage and vegetable crops cultivated with water from fish- and shrimp-farming tanks, supplied with saline water, have shown promising results (Carvalho Júnior et al, 2010; Gurgel et al, 2012; Simões et al, 2016). Among these crops, sorghum shows great production potential for cultivation under saline water and is considered as moderately tolerant to salinity (Dias & Blanco, 2010)
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