This study aimed to evaluate growth and production components of the colored cotton cultivar ‘BRS Topázio’ irrigated with saline water as a function of dose of potassium and proportions of nitrate and ammonium. The study was conducted in drainage lysimeters under greenhouse conditions, in a eutrophic Gray Argisol of sandy clay loam texture, in the municipality of Campina Grande, Brazil, from November 2014 to March 2015. A randomized block design was used to test five doses of potassium-DK (50, 75, 100, 125 and 150% of the recommendation for pot experiments) and five proportions of nitrate and ammonium-PNA (100/0, 75/25, 50/50, 25/75 and 0/100 mg of N kg-1 of soil). The K dose referring to 100% corresponded to 150 mg of K2O kg-1 of soil. N supply in NO3-/NH4+ proportion of 25/75, promoted increase in growth variables (plant height, stem diameter and leaf area) and mass of cotton bolls. The K dose of 145.5 mg of K2O kg-1 of soil promoted the formation of higher number of bolls plant-1. The application of K in the doses of 112.5 and 187.5 mg of K2O combined with 25/75 and 0/100 mg of NO3-/NH4+ promoted increment in cottonseed mass and the dose of 187.5 mg of K2O associated with 25/75 mg of NO3-/NH4+ increased the number of days for flower bud opening.
Key words: Gossypium hirsutum L., saline stress, mineral nutrition
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