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São Joaquim da Barra, Brazil

de Souza F.,Federal University of Pelotas | Argenta L.C.,Empresa de Pesquisa Agropecuaria e Extensao Rural e Santa Catarina S.A. EPAGRI | Nava G.,Estacao Experimental de Sao Joaquim | Ernani P.R.,Santa Catarina State University | Do Amarante C.V.T.,Santa Catarina State University
Revista Brasileira de Fruticultura | Year: 2013

Fuji' apple trees grown on Inceptisol and Entisol were annually fertilized with doses of N and K2O (0, 50, 100, and 200 kg ha-1, for both) along nine growing seasons. Changes of fruit maturity and quality at harvest and after cold storage in response to N and K2O fertilization were not the same for the two soil types. The increment of N rate applied increased the N content and reduced the starch content and peel red color of the fruit in both soils, regardless of K2O rate. On the Entisol, the increment of N rate increased the fresh mass and reduced the flesh firmness of the fruit, regardless of K2O rate, while in the Inceptisol this response was not consistent. Fruit titratable acidity (TA) reduced with the increment of N rate in both soils, especially at low rates of K2O. For the orchard on Inceptisol, the K and starch contents, TA, fresh mass, and peel red color increased, while the flesh firmness reduced consistently and independently of N rate, with the increment of K2O rate, but not for the orchard on the Entisol. The effects of N and K2O rates on flesh firmness and TA of the fruit were more evident after cold storage than at harvest. Source

Brighenti A.F.,Estacao Experimental de Sao Joaquim | Malinovski L.I.,Federal University of Santa Catarina | Stefanini M.,Istituto Agrario di San Michele allAdige Fondazione Edmund Machinery | Vieira H.J.,Florianopolis | Da Silva A.L.,Federal University of Santa Catarina
Revista Brasileira de Fruticultura | Year: 2015

The grapevine phenology, plant yield and grape quality have a strong relationship with environmental factors. The objective of this study was to compare the wine producing regions of the State of Santa Catarina in Brazil and the region of San Michele All’Adige located in Italy. The data used in this study came from São Joaquim Experimental Station - EPAGRI (28°16’30,08”S, 49°56’09,34”W, altitude 1,400 m), located in São Joaquim and from Istituto Agrario di San Michele All’Adige - Fondazione Edmund Mach (46°11’41,46 “N, 11°08’04,41”E, altitude 223m), located in the Province of Trento. The evaluated variety was Rebo, the main phenological stages were recorded and thermal requirement was calculated through the growing degree-days. The climatic parameters evaluated were, maximum, mean and minimum temperature, amplitude, precipitation, relative humidity, sunlight and solar radiation. At harvest was evaluated the agronomic performance. In São Joaquim the cycle of Rebo is longer, the heat summation is lower, the precipitation and accumulated solar radiation are higher than in San Michele All’Adige. Lower temperatures and lower sunlight during flowering-veraison are the main climatic factors related to lower yields. In São Joaquim, lower temperatures and higher rates of solar radiation during maturation contribute positively in the formation of phenolic compounds, but make difficult acids degradation of Rebo variety. © 2015, Sociedade Brasileira de Fruticultura. All rights reserved. Source

Do Amarante C.V.T.,CAV UDESC | Steffens C.A.,Estacao Experimental de Sao Joaquim | Katsurayama J.M.,Estacao Experimental de Sao Joaquim
Revista Brasileira de Fruticultura | Year: 2012

Bitter pit is a physiological disorder caused by calcium (Ca) deficiency in apples. However, recent publications have shown that bitter pit can be caused by an increase of gibberellins activity in the plant. This research was carried out to assess the effects of orchard spraying with prohexadione-calcium (Pr°Ca) (an inhibitor of gibberellins synthesis) and gibberellin GA 3 on vegetative growth of the trees and occurrence of bitter pit in the fruit. The experiment was conducted in an orchard located in São Joaquim, State of Santa Catarina (Southern Brazil), in 2009/2010. 'Catarina' and 'Fuji' apple trees were sprayed with water (control), Pr°Ca and GA 3 (both products at the dose of 319 mg L -1), at the petal fall stage (October 15, 2009), when shoots were 5-10 cm long, with treatments repeated after 20 days. The trees were evaluated in terms of chlorophyll content, area, dry mass and specific area of the leaves (in January/2010), and length of current season shoots and weight of shoots removed by winter pruning (in May/2010). Fruit were harvest at commercial maturity, cold stored (0±0.5°C/90-95% RH) for four months, and then assessed for occurrence of bitter pit after five days of shelf life. In both cultivars, vegetative growth of the trees was reduced by Pr°Ca and increased by GA 3 in comparison to the control. 'Catarina' and 'Fuji' apples from trees treated with Pr°Ca had lower occurrence of bitter pit after cold storage than the control treatment, as a result of lower contents of K, Mg and N, in relation to the Ca contents, assessed in the peel tissue of the fruit. On the other hand, the treatment with GA 3 increased the occurrence of bitter pit compared to the control in both cultivars. Source

Felipini R.B.,Federal University of Santa Catarina | Boneti J.I.,Estacao Experimental de Sao Joaquim | Katsurayama Y.,Estacao Experimental de Sao Joaquim | Neto A.C.R.,Federal University of Santa Catarina | And 3 more authors.
European Journal of Plant Pathology | Year: 2016

In this study, the effects of two elicitors (potassium phosphite and chitosan) on apple scab (Venturia inaequalis) and their ability to modulate plant defences were assessed. Potassium phosphite and chitosan were sprayed on apple seedlings 7 days before fungus inoculation, and disease intensity was evaluated 14 days after inoculation. Samples of leaves treated with phosphite or chitosan that proved to be susceptible and moderately susceptible to disease were then collected for analysis of their metabolic profile by attenuated total reflectance–Fourier transform infrared spectroscopy. The activity of the plant defence enzymes and the phenolic compound content were also determined by spectrophotometry and high performance liquid chromatography, respectively. The effect of product application on the germination of V. inaequalis was also evaluated. Moderately susceptible leaves presented higher peroxidase activity, regardless of the application of a product. Although it reduced spore germination by 45 %, chitosan did not affect the intensity of the disease. On the other hand, potassium phosphite (2 μL mL−1) reduced significantly the severity of scab by up to 62 % and it promoted the accumulation of salicylic acid, protocatechuic acid, and epicatechin in susceptible leaves, especially after the challenge with V. inaequalis. The salt did not exhibit antimicrobial activity. The resistance induced by potassium phosphite could thus play a significant role in scab control. © 2016 Koninklijke Nederlandse Planteziektenkundige Vereniging Source

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