Yield and fruit quality of yellow passion fruit fertilized with potassium and poultry and sheep manure

A maioria dos solos cultivados com maracujazeiro no Estado de Sergipe é de baixa fertilidade natural, o que tem ocasionado reduzida produtividade desta fruteira. Assim, objetivou-se avaliar a combinação de fontes de adubos orgânicos, esterco de frango e de ovino, às doses de potássio no rendimento e na qualidade das frutas do maracujazeiro-amarelo. O experimento foi realizado no Câmpus Rural da Universidade Federal de Sergipe. O delineamento experimental foi em blocos ao acaso, em esquema fatorial [(2x5)+1], constituído por 2 fontes de adubos orgânicos (esterco de frango na dose de 10 L e esterco de ovino na dose de 20 L) e 5 doses de potássio (0; 27; 54; 81 e 108 g planta-1) e um tratamento adicional (2,5 L de esterco de frango e 7,5 L de esterco de ovino). As variáveis estudadas foram teor de sólidos solúveis totais (SST), acidez total titulável (ATT), espessura de casca (ESPC) (mm), número de frutas/planta-1 (NFPLM) e rendimento (REND) (t ha-1), no primeiro ano de cultivo. O maracujazeiro-amarelo apresenta atributos adequados para consumo in natura e para a indústria, quando adubado com esterco de frango ou esterco de ovino associado às doses de potássio, promovendo SST entre 10,8 e 14,02 %, ATT de 8,48 a 7,57 g 100 mL-1 de suco, ESPC entre 6,52 e 7,12 mm, REND entre 27,5 e 30,24 t ha-1 e NFPLM de 28 a 29 frutas, respectivamente.The majority of soils grown with passion fruit plants in Sergipe State present low natural fertility and this has caused reduced productivity of this plant. Thus, the aim of this work was to evaluate the combination of organic fertilization sources from poultry and sheep manure, with potassium doses on yield and quality of yellow passion fruits. This experiment was carried out in the Research Station of the Universidade Federal de Sergipe. The experiment design was in a 2x5 randomized blocks (organic fertilizer x potassium doses) +1 factorial scheme. The treatments were constituted by 2 sources of organic fertilizers (T1=10 L of poultry manure and T2 = 20 L of sheep manure) and five potassium doses (0, 27, 54, 81 e 108 g plants-1) and an additional treatment (2.5 L of poultry manure + 7.5 L of sheep manure). The variables studied were: total soluble solid concentration (SST), total acidity by titration (ATT), cortex thickness (ESPC) (mm), number of fruit per plant (NFPLM) and yield (REND) (t ha-1), in the first year. Yellow passion fruits presents adequate attributes for consumption in natura and for the industry, when fertilized with poultry and sheep manure combined with potassium doses, promoting SST between 10.8 and 14.02%, ATT of 8.48 to 7.57 g 100 mL-1 of juice, ESPC between 6.52 and 7.12 mm, REND between 27.5 and 30.24 t ha-1 and NFPLM of 28 to 29 fruits, respectively