HIGHLIGHTS:
Peanut crops was not affected by the interactive effects of water and salt stress.
Water stress reduced plant height and stem diameter of peanut crop.
Increased irrigation water salinity negatively affected transpiration and leaf temperature.
ABSTRACT
Peanut crops are of great economic interest because their seeds are used as an important source of vegetable protein and edible oil. The objective of this study was to evaluate the physiological indices and growth of peanut crops subjected to saline and water stress. The experiment was conducted in Auroras, Redenção, Ceará, Brazil using a completely randomized split plot statistical design. The plots were composed of irrigation water treatments with varying levels of electrical conductivity - ECw (1.0, 2.0, 3.0, 4.0 and 5.0 dS m-1), while the subplots were formed by the water regimes of 50% and 100% crop evapotranspiration. Plant height, leaf number, shoot dry matter, relative chlorophyll level, transpiration, and leaf temperature were affected by salt stress. The water regime of 100% ETc provided better performance for the variables stem diameter, leaf number, and shoot dry mass of peanuts.
Key words:
Arachis hypogaea L.; water quality; water restriction
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*,** - Significant at p ≤ 0.05, and at p ≤ 0.01 by F test, respectively
** - Significant at p ≤ 0.01 by F test
*,**- Significant at p ≤ 0.05, and at p ≤ 0.01 by F test, respectively