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Productivity and physico chemical quality of yellow passion-fruit cultivated under different nitrogen sources through fertigation

Author: 
Regiana dos Santos Moura, Aureliano de Albuquerque Ribeiro, Marcelo Simeão, Luiz Paulo de Lima Simão, Dinamara Rodrigues de Sousa, Everaldo Moreira da Silva, Carlos José Gonçalves de Souza Lima and Gabriel Barbosa da Silva Junior
Subject Area: 
Life Sciences
Abstract: 

Nitrogen is the most required and limiting nutrient in the yellow passion-fruit yield. Fertilization through irrigation water provides more rational and efficient use of fertilizers. This study aimed at assessing productive and qualitative parameters of yellow passion-fruit based on different sources and doses of nitrogen through fertigation in Vale do Gurgueia – PI. The experiment was conducted from June 2013 to August 2014 in the city of Cristino Castro – PI. The experimental design was randomized and arranged in a 2 x 5 factorial scheme, with four replicates. Treatments were consisted of combined two nitrogen sources (urea and ammonium sulfate) and five nitrogen levels (100, 200, 300, 400 and 500 kg ha-1 year-1), each plot had six plants 3.0 x 3.0 m spaced, totaling 1,111 plants ha-1. The fertigation, occurred during the crop cycle, was weekly performed. Yield was evaluated per plant, productivity and mean weight of fruit. In pulp, pH, soluble solids, titratable acidity, (SS/TA) ratio and pulp percentage were evaluated. Increased ratios of N, ammonium sulfate source, cause reduction in fruit pulp percentage of the yellow passion-fruit. Soluble solids and pH of fruit pulp have chemical quality within ranges established by normative instruction of MAPA. To urea source, it is recommended 227.87 kg ha-1of N for a productivity of 15.48 t ha-1and 309.5 kg ha-1of N, as ammonium sulfate, for a productivity of 14.92 t ha-1.

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