Crescimento e qualidade do melão Cantaloupe (Hy Mark) sob adubação nitrogenada e potássica no Brejo paraibano.

• Ano de defesa: 2017
• Autor(a) principal: Oliveira, Janailma Lima de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Fitotecnia e Ciências Ambientais; Programa de Pós-Graduação em Agronomia; UFPB
• Palavras-chave em Português: Agronomia.; Cucumis melo L.; Multiplex.; Maturação.; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/18434

Mineral fertilization is of fundamental importance in relation to increased productivity, in the quality of plant products, presenting itself as a tool to replace nutrients necessary for the growth and development of melon. This dissertation consists of two chapters, in which the growth curve of melon (Cucumis melo L.) Cantaloupe 'Hy Mark' submitted to doses of nitrogen and potassium fertilization, in Brejo paraibano, as well as the efficiency of the nonmethod destructive, using the fluorescence sensor (Multiplex®). The experiment was carried out at the Experimental Farm Chã de Jardim, belonging to the Federal University of Paraíba, Campus Areia-PB, with a randomized block design, consisting of 4 replications, totaling 40 plots. The treatments consisted of a combination of five doses of nitrogen (N) and potassium (K), distributed through the Pan Puebla III matrix, totaling 10 treatments. The doses of N corresponded to 12; 72; 120; 168 and 228 kg ha-1 and those of K 18; 108; 180; 252 and 342 kg ha-1. The fruits were evaluated at 48, 50, 52, 54 and 56 days after planting (DAP), and 3 fruits per treatment were analyzed, totaling 30 fruits per DAP. Physical, chemical, physicalchemical and physiological analyzes of the fruits were performed, consisting of the following variables: length of the fruit, diameter, fresh weight, firmness, color of the skin and pulp (L *, a *, b *), length and internal cavity diameter, skin and pulp thickness, ascorbic acid content, titratable acidity, soluble solids, SS / AT ratio, total chlorophyll, flavonoids, carotenoids. For non-destructive analyzes, according to the second chapter, it was used using the optical fluorescence sensor (Multiplex®). In this chapter, the principal component analyzes were used in order to summarize the chemical characteristics evaluated in Cantaloupe melon cv. Hy Mark, which allowed to identify two main components, which represent 78% of the total variance of the original characteristics. After 52 DAP, the firmness decreased concomitantly with the evolution of the color of the skin and pulp at the same time that the chlorophyll degradation occurred with the synthesis of flavonoids, indicating the point of harvest. The most fruit mass was obtained with a dose of 168 kg of N. ha-1. The melon grown in Brejo Paraibano takes 54 days after planting to fully mature. The doses of N and K2O influenced the readings of the fluorescence indices: YF_UV, RF_UV, FRF_UV, FRF_B, YF_G, RF_G, FRF_G, YF_R, RF_R, FRF_R, SFR_R, BRR_FRF, fluorescence excitation rate (FERARI); the variables of component 1 (CP1) collaborate with 65.1% of the explained variance, higher than the variables of CP2, which may be an indicator of the physiological development of the fruit.