Mudas de mamoeiro (carica papaya l.) irrigadas com diferentes tipos de água.

Abstract

Irregular rainfall and high evapotranspiration are characteristic of the semi-arid region of Northeast Brazil. All these variables make water a limiting factor for irrigated agriculture, which makes reuse necessary, especially in locations under increasingly scarce conditions. This work aimed to propose the use of air conditioning and agroindustrial effluent in the production and development of papaya seedlings. The research was developed in the sector of seedlings production located at the Federal Institute of Paraíba, Campus Sousa. A completely randomized block design with five treatments and four replications was used. The treatments resulted from the following combinations: T1 = 100% Artesian Well (PA), T2 = 100% Air Conditioning (AC), T3 = Combination 50% Air Conditioning + 50% Agroindustrial Effluent + 50% Air Conditioning (EA + AC) and T5 = 100% Agroindustrial Effluent (EA). Papaya seedlings were produced in plastic bags using Fluovian Neosol and manure in the proportion (2: 1) as substrate. The following variables were evaluated: plant height, stem diameter, number of leaves, green and dry mass of shoot and root, nitrogen (potassium, nitrogen and phosphorus) content and influence on soil attributes (pH, P, K, Na, Ca, Mg, MO, PST). The use of agroindustrial effluent water resulted in lower results for most variables. The use of air conditioning arises as an economically viable alternative for the use in irrigation of papaya seedlings.