Ecofisiologia do pimentão sob estresse salino e adubação nitrogenada.

Abstract

The use of saline water for irrigation purposes in semi-arid regions is a challenge for horticultural production, as it is a region of irregular rainfall, low precipitation, resulting in water scarcity, so the available water is almost always underground, in which it is acquired through drilling artesian wells, Due to the fact that vegetables are plants sensitive to saline stress conditions, it is necessary to use techniques that provide the acclimatization of plants, highlighting nitrogen fertilization. In view of the above, the objective was to evaluate the chloroplast pigments, the water relations and the growth of bell pepper cultivated under saline water and nitrogen fertilization. The experiment was conducted under field conditions at the Federal University of Campina Grande, Pombal-PB, where an experimental design was used in randomized blocks in a 5 × 5 factorial scheme, referring to five levels of electrical conductivity of irrigation water (0.3; 1; 1.7; 2.4 and 3.1 dS m-1) and five doses of nitrogen (50; 75; 100; 125 and 150% of the recommended dose for the culture), with three replications. Doses of 125 and 150% of N provide higher relative water content in sweet pepper plants irrigated with water with an electrical conductivity of up to 1.7 dS m-1. The contents of chlorophylls a, b, total, carotenoids and stem diameter of bell pepper were reduced when fertilized with 150% N and irrigated with water with electrical conductivity of 3.1 dS m-1.