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The decrease in the availability of water resources, especially in semi-arid regions, increases every day the need for solutions to supply this deficit water demand. Under low supply of good-quality water, the generation of technologies and research that allow the use of saline waters is currently an essential activity. Hence, this study aimed to evaluate the effect of different saline levels of the irrigation water and nitrogen (N) fertilization doses on the emergence, morpho-physiology and flowering of colored-fiber cotton, cv. ‘BRS Rubi’, in an experiment conducted in lysimeters under greenhouse conditions in a Eutrophic Neolithic soil of a sandy-loam texture, in the municipality of Campina Grande-PB, Brazil. The experiment was conducted in a randomized block design and the treatments consisted of five levels of irrigation water salinity with the following electrical conductivities ECw (5.1, 6.1, 7.1, 8.1 and 9.1 dS m), combined with five N doses ND (65; 100; 135; 170; 205 mg of N kg of soil), distributed in a 5 x 5 factorial scheme with three replicates. The effects of the treatments were evaluated, through variables: emergence percentage, emergence speed index, gas exchanges, stomatal conductance , transpiration, CO2 assimilation rate, internal CO2 concentration, instantaneous carboxylation efficiency, instantaneous water use efficiency, stem diameter, plant height, leaf area, number of days for flower bud opening and flower abortion rate. Germination, gas exchanges and growth of the cotton cv. ‘BRS Rubi’ are negatively affected by irrigation water salinity from 5.1 dS m on wards. Irrigation using water with ECw higher than 5.1 dS m prolonged the period of opening of flower buds and promoted increase in flower abortion rate and internal CO2 concentration. Increasing doses of N led to increment in cotton stomatal conductance and the highest value was obtained at the dose of 205 mg of N kg of soil; irrigation water salinity levels and N fertilization doses acted as independent factors for the studied variables of the cotton crop.

australian journal of crop science

Emergence, morpho-physiology and flowering of colored-fiber cotton (Gossypium hirsutum L.) submitted to different nitrogen levels and saline water stress irrigation