Nitrogen fertilization in the production of pitaya

?rea de concentra??o: Produ??o Vegetal.Submitted by Nivaldo Melo (nivaldo.melo@ufvjm.edu.br) on 2019-09-11T12:03:00Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) deilson_almeida_alves.pdf: 318851 bytes, checksum: 0af5b18de1ee6c784e8fb009b9ea450e (MD5)Approved for entry into archive by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2019-10-24T18:39:07Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) deilson_almeida_alves.pdf: 318851 bytes, checksum: 0af5b18de1ee6c784e8fb009b9ea450e (MD5)Made available in DSpace on 2019-10-24T18:39:07Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) deilson_almeida_alves.pdf: 318851 bytes, checksum: 0af5b18de1ee6c784e8fb009b9ea450e (MD5) Previous issue date: 2018O manejo da fertiliza??o nos pomares de pitaia no Brasil ? feito, basicamente, utilizando-se fontes org?nicas, por n?o haver informa??es sobre a fertiliza??o mineral adequada para o crescimento e a produ??o da esp?cie, o que tem ocasionado varia??o na produtividade dos pomares. Dessa forma, pesquisas relacionadas ? fertiliza??o mineral s?o essenciais para subsidiar a adequa??o do manejo nas condi??es edafoclim?ticas brasileiras. Nesse sentido, a pesquisa foi realizada com o objetivo de avaliar a fertiliza??o nitrogenada sobre a produtividade, as caracter?sticas f?sico-qu?micas das frutas e os teores de nutrientes nos clad?dios nas esp?cies Selenicereus megalanthus, Hylocereus undatus e Hylocereus polyrhizus. O experimento foi conduzido em condi??es seguindo o arranjo fatorial 3 x 4, em blocos casualizados. Os fatores foram tr?s esp?cies de pitaia e quatro doses de N, 0, 50, 100 e 200 g por planta, no segundo ano ap?s o plantio, e 50, 100, 200 e 300 g por planta, no terceiro ano ap?s o plantio, com quatro blocos e tr?s plantas por parcela. A fertiliza??o nitrogenada proporcionou aumento da produtividade das esp?cies S. megalanthus, H. undatus e H. polyrhizus. A fertiliza??o nitrogenada deve ser realizada de acordo com a idade do pomar, considerando a produtividade alcan?ada. O aumento da produtividade comercial no terceiro ano ap?s o plantio, nas esp?cies S. megalanthus e H. polyrhizus, ocorreu com a aplica??o de 300 g de N por planta e, para a esp?cie H. undatus, com a aplica??o de 250 g de N por planta. O aumento da fertiliza??o nitrogenada proporcionou melhoria na qualidade das pitaias, que alcan?aram maior tamanho, sem alterar o sabor. Os teores de nutrientes nos clad?dios aumentaram com a fertiliza??o nitrogenada e a disponibilidade no solo. Os atributos qu?micos do solo devem ser monitorados para corrigir as defici?ncias e assegurar a disponibiliza??o de nutrientes para as plantas, pois, com o manejo adequado da fertiliza??o nitrogenada, a demanda das plantas por nutrientes aumenta.Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2018.The management of the fertilization in the pitaya orchards in Brazil is done, basically, using organic sources, because there is no information about the adequate mineral fertilization for the growth and production, which has caused variation in the orchards productivity. Thus, research related to mineral fertilization is essential to subsidize the adequacy of the management in Brazilian soil and climatic conditions. In this sense, the research was carried out with the objective of evaluating the nitrogen fertilization on productivity, physicochemical characteristics of fruits and nutrient concentration in cladodes in the species Selenicereus megalanthus, Hylocereus undatus and Hylocereus polyrhizus. The experiment was conducted under field conditions following the 3 x 4 factorial schem, in randomized blocks. The factors were three species of pitaya and four doses of N, 0, 50, 100 and 200 g per plant in the second year after planting, and 50, 100, 200 and 300 g per plant, in the third year after planting, with four blocks and three plants per plot. Nitrogen fertilization provided an increase in productivity of the species S. megalanthus, H. undatus and H. polyrhizus. Nitrogen fertilization should be performed according to the age of the orchard, considering the productivity achieved. The increase in commercial productivity in the third year after planting in the species S. megalanthus and H. polyrhizus occurred with the application of 300 g of N per plant and, for the H. undatus, with the application of 250 g of N per plant. Increased nitrogen fertilization provided an improvement in the pitaya quality, which reached bigger size, without changing the flavor. Nutrient concentrations in cladodes increased with nitrogen fertilization and soil availability. The chemical attributes of the soil should be monitored to correct the deficiencies and ensure the availability of nutrients to the plants, because, with the proper management of nitrogen fertilization, the demand of the plants by nutrients increases