Nutritional Status and Total Phenols of Passiflora Genotypes Related to Nitrogen Fertilization

Abstract

This paper was developed in order to verify the influence of nitrogen fertilization and different genotypes in the nutritional aspect and in the production of total phenols in passifloraceae. The experimental design was randomized blocks in a 5 × 2 × 2 factorial scheme, being five genotypes of Passiflora (three genotypes of Passiflora edulis , a genotype of Passiflora alata and a genotype of Passiflora ligularis ), two levels of cow manure (with and without) and two doses of N (20 and 80 g), with four replicates. At 120 days after sowing, levels of foliar nutrient and total phenols were determined. Foliar N content varied depending on N doses, organic fertilization and the genotypes used. Foliar levels of P and K were higher when all genotypes received organic fertilization, while the levels of Fe and Mn were similar regardless of this fertilization. The levels of Ca and Mg were higher related to organic fertilization and the genotypes, in isolation. But the foliar contents of S, Zn and Cu increased only in relation to the used genotypes, and the average foliar content of total phenols found was 19.4 g · kg -1 , ranging from 13.1 to 23.2 g · kg -1 , being the lowest value observed in Passiflora alata without fertilization with cow manure. It is concluded that the nutritional requirement for N is greater for genotypes of the species Passiflora edulis in relation to the species Passiflora alata and Passiflora ligulares , and that the organic fertilization influences positively in the production of total phenols only for the genotype of sweet passion fruit.