Mudas de tamarindos irrigadas com diferentes tipos e proporções de águas.

Abstract

Irregular pluvimetric precipitations and high evapotranspiration are characteristic of the semiarid region of northeastern Brazil. The set of these variables make water a limiting factor for irrigated agriculture, which makes reuse necessary, especially in places under conditions of growing scarcity. This work aimed to propose the use of water from air conditioning and agroindustrial effluent in the production and development of Tamarind seedlings. The research was developed in the seedling production sector located at the Federal Institute of Paraíba, Campus Sousa. A completely randomized block design was used, with five treatments and four replications. The treatments resulted from the following combinations: T1 = 100% Artesian well (PA), T2 = 100% air conditioning (AC), T3 = combination 50% air conditioning + 50% Artesian well (AC + PA), T4 = combination 50% Agroindustrial effluent + 50% air conditioning (EA + AC) and T5 = 100% Agroindustrial Effluent (EA). Tamarind seedlings were produced in plastic bags, using Neossol Fluvic and manure in proportion (2:1) as substrate. The following variables were evaluated: plant height, stem diameter, number of leaves, green and dry mass of the aerial part and root, root length and influence on soil attributes (pH, P, K, Na and OM) The agroindustrial effluent is recommended for irrigation of Tamarind seedlings, despite the high levels of sodium and chloride, and also an alternative arboreal species for the reintegration of salinized soils. The soil irrigated with air-conditioned water during the experimental period expressed lower saline content due to its low sodium concentration in the soil, showing as a viable alternative for irrigation use.