Crescimento inicial e aspectos fisiológicos de feijão- Caupi sob manejo com águas residuárias de sala de ordenha

Abstract

Cowpea is an important Fabaceae in the tropical and subtropical regions of the world. In northeastern Brazil the average productivity estimated at 1,078 kg ha-1, however, its cultivation is dependent on irrigation, although it is a plant adapted to these areas, a technique that requires water, a limited resource in the region, and it is necessary to use strategies to optimize its use, such as the use of wastewater, and these should be used rationally. Thus, the objective was to study the initial growth and physiological aspects of cowpea seedlings under irrigation depths and mixtures of wastewater from dairy cattle. For this, an experiment was carried out in the urban area of the municipality of Nossa Senhora da Glória-Sergipe, using an experimental design of randomized blocks in four replications and treatments formed from a subdivided plot, with the portion relative to three water concentrations, 100% wastewater, 100% water supply and 50% wastewater + water supply; and the subplot composed of four irrigation depths, L1 - 50%, L2 - 75%, L3 - 100% and L4 - 125% of the actual evapotranspiration (%ETr). Sowing occurred in polyethylene trays, one seed per cell filled with commercial and organic substrate, in a ratio of 1:1. At 30 days after sowing, the growth (fresh/dry mass and leaf area) and physiological (SPAD Index, total chlorophyll content and electrolyte extravasation) were analyzed, and the data were submitted to statistical analysis using the Sisvar program, when analyzing the variables the only one that presented sensitivity was the fresh mass of the leaves. Thus, wastewater of dairy cattle can be used for the production of cowpea seedlings, as they did not compromise the growth and physiological variables