Qualidade Do Abacaxizeiro ‘Brs Imperial’ Em Função De Doses De N-K

Abstract

RESUMO-A qualidade do fruto do abacaxizeiro é influenciada pelos macronutrientes, principalmente N e K. Este trabalho avaliou a influência de doses de N e K 2 O sobre as características de qualidade físico-químicas e sobre os defeitos externos e internos dos frutos de abacaxizeiro 'BRS Imperial'. Aplicaram-se quatro doses de n (0; 160; 320; 550 kg ha -1 ) e quatro de K 2 o (0; 240;480 e 600 kg ha -1 ), em delineamento experimental em blocos ao acaso, com cinco repetições, em um fatorial completo 4 2 . As doses de N e K 2 O influenciaram todas as variáveis físico-químicas estudadas, exceto a firmeza dos frutos, que apresentaram média de 10,7 kgf. QUALITY OF PINEAPPLE 'BRS IMPERIAL' AS A FUNCTION OF N-K DOSESABSTRACT -Pineapple fruit quality is influenced by macronutrients, particularly N and K. This study evaluated the influence of N and K 2 O doses on physicochemical quality attributes and on the incidence of external and internal defects of 'BRS Imperial' pineapple fruits. Four levels of N (0, 160, 320, 550 kg ha) and four of K 2 o (0, 240, 480 and 600 kg ha -1 ) were tested in a randomized blocks experimental design with five replicates, in a 4 2 full factorial scheme. The doses of N and K 2 O influenced all physicochemical variables, except fruit firmness that averaged 10.7 kgf. The N doses reduced titratable acidity (TA) and soluble solids (SS) and increased pH and fruits' ratio, with average values of 0.31%, 17.9 o Brix, 4.02 and 57.7, respectively, at 550 kg ha -1 of N. The K 2 o doses increased tA and SS and reduced the ratio of fruit, with average values of 0. 41%, 19.4 o Brix and 47.9, respectively, at 600 kg ha -1 of K 2 O. The pH quadratic response showed the minimum value of 3.95 at 273 kg ha -1 of K 2 O. Significant Pearson correlations indicated that plants with higher N leaf contents at the time of floral induction produced fruits with lower TA and SS, while plants with higher K leaf contents produced fruits with higher TA and SS. The application of 550 kg ha -1 of n, the fruits showed translucency between 50 and 75% without potassium fertilization and less than 25% at 400 kg ha -1 of K 2 o.

Post-harvest quality of ‘Vitória’ pineapple as a function of the types of shoots and age of the plant for floral induction

“…The fruits of floral induction at 12 months after planting and natural flowering presented the highest mean values and did not differ significantly from each other, that is, in the later inductions, the fruits were physically firmer. These results corroborate with those found by Oliveira et al (2015), when evaluating the influence of N and K doses on the physical-chemical quality characteristics of 'BRS Imperial' pineapple fruits with induction at 13 months after planting, verified an average of 10.7 kgf of fruit firmness. It is likely that the achieved result is due to the better formation of the fruits in relation to the consistency of their fibers, thus, being firmer and providing better resistance in the evaluation of the fruits belonging to the late induced plants, considering that they were harvested at the same maturation stage.…”

Integrated system for recommending fertilization rates in pineapple (Ananas comosus (L.) Merr.) crop

“…The eight fertilizers doses (N-P-K) proposed for the pineapple zone of Huimanguillo, Tabasco, Mexico, agree with the recommendations for other pineapple zones of Mexico and the World (450-100-400, Teixeira et al, 2002;240-120-240, Devadas &Kuriakose, 2005 andOliveira et al, 2015;200-50-200, Betancourt et al, 2005).…”

Quality of ‘Imperial’ pineapple infructescence in function of nitrogen and potassium fertilization

“…Omotoso & Akinrinde (2013) reported a decrease in soluble solids content and titratable acidity of 'Smooth Cayenne' with the application of high doses of N and related to the dilution of the cell content caused by the increase in infructescence mass. Oliveira et al (2015) reported the application of 550 kg ha -1 of N titratable acidity…”

“…Imperial had the SS/AT ratio values of 42.56, much higher than those found in other cultivars. Oliveira et al (2015) evaluating doses of N and K 2 O in cv. Imperial, found a higher value of 57.7 of this relation in the dose of 550 kg ha -1 of N. This result was higher than this study, although the values reached are within the marketing standard of the infructescences.…”