Efeito da água residuária tratada, nitrogênio e fósforo na qualidade da fibra do algodão. Parte II.

Abstract

This research was developed in field conditions of the Station of Treatment of Sewer of the Company of Water and Sewers of Paraíba, in the city of Campina Grande, Paraíba state, Brazil. The objective was to verify the effect of wastewater depths (367, 505, 643 and 781 mm) in the presence and in the absence of nitrogen and phosphorus in the doses of 90 and 60 kg ha-1 of N and P, respectively, plus two additional treatments irrigated with 643 mm with water of provisioning and receiving 90 and 180 kg ha-1 of nitrogen, on the quality and technological characteristics of the fiber of the brown cotton, cultivate BRS 200 (Gossypium hirsutum L.). The experimental design was in randomized blocks in mixed factorial scheme (2 x 2 x 4) + 2, with three repetitions. There was significant effect among the wastewater depths tested on the index of short fibers. There was not significant effect with the absence and presence of the nitrogen and phosphorus manuring on the appraised variables, except for the phosphorus where there was effect for the reflectance and the yellow degree. There were not negative alterations for the textile characteristics of the fiber, when wastewater was used in the irrigation of the brown fiber cotton plant.