Produtividade e qualidade de abacaxizeiro cv. Smooth Cayenne, cultivado comaplicação de doses e parcelamentos do nitrogênio, em Guaraçaí-SP

Abstract

de N, e quatro parcelamentos: toda a dose aplicada antes da indução floral, metade da dose antes da indução floral e a outra metade após a indução, 2/3 da dose antes da indução e 1/3 da dose após a indução e toda a dose após a indução floral. A aplicação total do N após a indução floral, independentemente da dose, resultou em menores teores foliares de N e dimensões da folha "D", apresentando na colheita frutos pequenos, com menor índice de maturação e maior acidez. Para obtenção de frutos de abacaxi cv. Smooth Cayenne, com maior tamanho, massa e maior teor de SST e menor acidez, a adubação nitrogenada pode ser aplicada em dose total, antes da indução floral, ou parcelada 2/3 antes e 1/3 após esta indução. A adubação nitrogenada incrementou os teores foliares de N, entretanto não teve efeito nas dimensões, produtividade e qualidade de frutos de abacaxizeiro cv. Smooth Cayenne. Termos para Indexação: Sólidos solúveis, acidez titulável e adubação nitrogenada. PRODUCTIVITY AND QUALITY OF PINEAPPLE cv. SMOOTH CAYENNE, CULTIVATED WITH NITROGEN DOSES AND SPLITTING APPLICATION IN GUARAÇAÍ-SPABSTRACT -Fertilization is one of the factors that influence the production and fruit quality, thus the need to study the nitrogen effect applied before and after the floral induction in pineapple fruit characteristics is fundamental. The aim of this study was to evaluate the productivity, nutritional status and the quantitative and qualitative aspects of pineapple fruits 'Smooth Cayenne' subjected to nitrogen doses and splitting, grown in Guaraçai-SP. A randomized completely blocks design was carried out with four replications and sixteen treatments in a factorial scheme 4x4, with four doses of N: 7.5, 15, 22.5 and 30 g of N per plant, and four split doses: all the dose applied before floral induction, half the dose before floral induction and the other half after induction, 2 / 3 of the dose before induction and 1 / 3 of the dose after induction and the entire dose after floral induction. The total application of N after floral induction, regardless of the dose resulted in lower leaf N contents and leaf dimensions "D", featuring small fruit at the harvest, with lower maturation rates and higher acidity. To obtain pineapple fruits 'Smooth Cayenne', of bigger size and mass; higher TSS and lower acidity, the nitrogen fertilization can be applied in full dose before floral induction or split 2 / 3 before and 1 / 3 after this induction. Nitrogen fertilization has increased foliar concentrations of N, but had no effect on size, yield and fruit quality of pineapple cv. 'Smooth Cayenne'.

Growth and production of irrigated vitória pineapple grown in semi-arid conditions

“…After the initial growth period, plant growth characteristics (plant height, stem diameter, D-leaf length and mass) and fresh and dry biomass production of different plant components (leaves, stem, root) increased significantly, followed by the flower induction process at the end of stage V5 (approximately 630 DAP), with a subsequent stabilization in vegetative growth. These results are in accordance with the findings by Marques et al (2011), who reported that the vegetative growth of pineapple plants is drastically reduced after flowering/fructification when the plant's metabolism is directed to fruit development. These observations are common knowledge and serve as a basis for determining the phenological stages of pineapple plants (FOURNIER et al, 2010;RODRIGUES et al, 2010;SAMPAIO et al, 2011).…”

Growth of leaf D and productivity of ‘Imperial’ pineapple as a function of nitrogen and potassium fertilization

“…The length and/or the fresh mass of leaf D in pineapple are considered reference estimates to define the moment of floral induction, as it generally presents a positive correlation with the mass and length of the infructescence at harvest (Rodrigues et al, 2010;Marques et al, 2011).…”

“…In this sense, in pineapple, the length and fresh mass of leaf D have been used as parameters to estimate plant maturity and productivity in cultivars already established in the market, such as 'Pérola' and 'Smooth Cayenne' (Rodrigues et al, 2010;Marques et al, 2011). Vilela et al (2015) recommends doing the floral induction in cv.…”

Quality and sensory acceptance of ‘Pérola’ pineapple grown in soil with application of organic fertilizer

“…Type and doses of fertilizer applied and the timing of application influence the internal and external quality of pineapple fruits (COELHO et al, 2007;GUARÇONI & VENTURA, 2011;MARQUES et al, 2011, OLIVEIRA et al, 2015. According to COELHO et al (2007), the average fruit weight of the 'Jupi' pineapple was significantly higher at a dose of 93 g of NPK (20:05:20) plant -1 while the use of higher doses increased the contents of soluble solids and titratable acidity and reduced the soluble solids/ titratable acidity ratio.…”