West Indian cherry (Malpighia emarginata) is a fruit crop widely grown in the semi-arid region of Northeast Brazil and stands out for its high nutritional value, especially as a source of ascorbic acid, vitamin A, iron, calcium and vitamins B-complex: thiamine, riboflavin and niacin (Esashika et al., 2013).
For this purpose, it is necessary to conduct studies in order to identify salinity-tolerance indices of crops, including West Indian cherry, aiming to establish the degree of restriction of certain types of water for irrigation (Lima et al., 2014), because there are few studies in the literature with this fruit crop under salt stress conditions in the post-grafting stage (Sa et al., 2017, 2018).
The importance of potassium fertilization in West Indian cherry cultivation is due to its physiological role in the activation of various enzymatic systems and phosphorylation reactions, which are fundamental for the metabolic processes, especially the production of proteins and sugars.
The West Indian cherry (Malpighia emarginata DC.) is a fruit crop highly adaptable to the most diverse climates.
The objective of this study was to evaluate the interaction between salinity of irrigation water associated with nitrogen and phosphate fertilization on water relations, gas exchange and chloroplastidic pigments of the West Indian cherry.
The West Indian cherry plants were grown in lysimeters, filled with 235 kg of soil, each lysimeter had two 18 mm equally spaced drains at the bottom.
Originally, botanists classified the Barbados cherry as Malpighia glabra and the West Indian cherry
West Indian cherry (Malpighia emarginata D.C.) is a fruit crop that has stood out as an excellent natural source of vitamin C, besides anthocyanins and carotenoids, compounds with beneficial effects on human health due to their recognized antioxidant action (Maciel et al., 2010).
In the Northeast region, West Indian cherry production reaches 22,964 tons in an area of 7,237 ha, which represents about 70% of the Brazilian production (Caetano, 2010).
Although the benefits of K fertilization are known, studies providing evidence of its mitigating action under conditions of saline stress on plants, mainly in West Indian cherry, are still scarce in the literature.
West indian cherry (Malpighia emarginata L.) is a tropical fruit crop whose fruits stand out for their high content of vitamin C, which varies from 1000 to 1800 mg 100[g.sup.-1] (Cunha Neto et al., 2012).
Despite the expressive contribution of the west indian cherry crop to the Northeast region of the country, its yield is limited by numerous biotic and abiotic factors, particularly the availability and quality of water for irrigation, fertilization management, low rainfall and irregular rainfalls in semi-arid areas.