Nitrogen sources on yield, mineral nutrition and bromatology of Cyclanthera pedata

Autor(es)

Valadares, Samuel V. ; Valadares, Rafael V. ; Costa, Candido A. ; Martins, Ernane R. ; Fernandes, Luiz A.

• Tipo de documento: Artigo Científico
• Fonte: Horticultura Brasileira; v. 38, n. 1, p. 5-pg., 2020-01-01.

Resumo

Caygua fruits (Cyclanthera pedata) are used both in cooking and for medicinal purposes. However, few studies on this species, considered a non-conventional vegetable, can be found in literature. This study aimed to assess the responses of caygua crop to green manure and mineral nitrogen fertilization, in relation to marketable fruit productivity, nutrient content in leaves and fruits and bromatological composition. The study was carried out in a randomized block design with four treatments and five replicates: 1) control (without nitrogen); 2) 60 kg ha(-1) nitrogen (urea form); 3) green manuring using Cajanus cajans and 4) green manuring using Crotalaria juncea. The plots consisted of three caygua lines with four plants per line (spacing 2x1 m). In the treatments using green manure, three lines of these respective legumes were cultivated. We evaluated marketable fruit productivity, nutrient contents in fruits and leaves and bromatological composition of the fruits. Production of caygua fruits was higher in the treatment consisting of urea application (23.6 t ha(-1)), followed by Crotalaria juncea (15.6 t ha(-1)), Cajanus cajans (14.8 t ha(-1)) and control (9.2 t ha(-1)). Treatments did not influence the nutrient contents in fruits and leaves and the bromatological composition. However, in relation to higher productivity, the amounts of nutrients absorbed by plants and accumulated in fruits were higher in treatments using mineral fertilization due to the higher yield. The bromatological analysis of fruits showed considerable contents of crude protein and ether extract, highlighting the potential of this species to human diet. (AU)

• Processo FAPESP: 18/24707-0 - Avaliação dos efeitos de sistemas de integração lavoura-pecuária e práticas de manejo associadas em processos de ciclagem de carbono e nitrogênio no solo usando o modelo Daycent
• Beneficiário: Rafael Vasconcelos Valadares
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado