PRODUÇÃO DE INHAME (Dioscorea cayennensis) ADUBADO COM DOSES DE NITROGÊNIO E TIPOS DE TUTORAMENTO

Abstract

In the cultivation of the yam, the practice of mineral fertilization and the use of tutoring are essential to obtain good production. The work was carried out under field conditions at the Federal University of Paraíba (UFPB), in Areia, PB, from February to December / 2015, with the objective of evaluating yam production and quality as a function of nitrogen and types of tutoring. The experimental design was randomized blocks with the treatments distributed in a 5 x 3 factorial scheme, with five nitrogen doses (0, 50, 100, 150, 200 kg ha-1) and three types of tutoring (espaldeiramento, rod, and sem tutor) in four replicates. The plots were composed of 40 plants all considered useful. Ten t ha-1 of bovine manure, 120 kg ha-1 of P2O5 and 100 kg ha-1 of K2O were supplied to the plantation fertilization, and the nitrogen rates described in the design were applied in coverage and divided into 60 and 90 days after planting. Length, average mass, total and commercial yields of tubers, leaf nitrogen content, and starch content were evaluated. The results showed that the nitrogen rates positively influenced all the characteristics evaluated in yams, but there was a difference in relation to the types of tufts. The length and total and commercial yields were higher when sowing with sticks was used and the average mass of nozzles and leaf N content were higher with the use of espalier. The content of starch was not altered by the types of mentoring. The lowest values for the evaluated characteristics were verified in the treatments without tutoring.