Crescimento e trocas gasosas de aceroleira irrigada com águas salinas sob combinações de adubação nitrogenada-potássica - DOI:10.5039/agraria.v15i1a6333

Fertilization management has been one of the techniques used to mitigate salt stress on crops. In this context, this research aimed to study the effect of different combinations of nitrogen and potassium fertilization on growth and gas exchange of the acerola crop irrigated with salinized water at different vegetative phase periods. The experiment was conducted in field, in a randomized block design, with treatments arranged in a 5 x 4 factorial scheme, referring to five irrigation water salinities (ECw): 0.3, 1.3, 2.3, 3.3 and 4.3 dS m -1 and four combinations of nitrogen and potassium dosages: C1 = 70% + 50%; C2 = 100% + 75%; C3 = 130% + 100% and C4 = 160% + 125% of N and K2 O, respectively, of the recommended dose for acerola, with three replicates and one plant per plot, consisting of a 60 L pot. Harmful effects of water salinity manifested at 230 days after transplantation (DAT) on the stem and primary shoot diameter, from ECw of 2.32 dS m -1  on, and the tested fertilizer combinations did not mitigate them. Fertilization with 70% N + 50% K2 O favored gas exchange activity and higher plant growth from 170 DAT, regardless of water salinity.