Data/hora: 07/06/2024 17:01:23

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	05/06/2020	
Data da última atualização: 	05/06/2020	
Autoria: 	SETE, P. B.; CIOTTA, M. N.; NAVA, G.; STEFANELLO, L. O.; BRACKMANN, A.; BERGHETTI, M. R. P.; CADONÁ, E. A.; BRUNETTO, G.	
Título: 	Potassium fertilization effects on quality, economics, and yield in a pear orchard.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Agronomy Journal, Madison, EUA, v. 112, n. 2, p. 1-11, 2020.	
Idioma: 	Inglês	
Conteúdo: 	Potassium fertilization effects on quality, economics, and yield in a pe Potassium (K) nutrient existent in the soil does not always supply pear tree demand, which makes the use of potassium-based fertilizer necessary. The objective of this study was to evaluate the impact of potassium fertilization on yield and pears quality in order to establish critical K levels in soil and leaves. The treatments consisted in the application of 0, 40, 80, 120 and 160 kg K 2O ha-1 year-1 during four crops (2013 to 2017). The fruit quantity, mass and yield were evaluated, as well as leaves, which were submitted to a nutrient analysis. Stratified soil samples were collected, prepared and subjected to exchangeable K extraction by Mehlich-1. In the last two crops, peel color, ethylene production, and respiratory rate were also evaluated after 90 days inside a controlled atmosphere storage chamber. After stored, pears were submitted to a shelf life of 7 days to evaluate the epidermis color, ethylene production, respiratory rate, total titratable acidity (TTA), soluble solids (SS) and pulp firmness. The potassium fertilization increased the exchangeable K contents in the soil, but it was not always correlated with an increase of K concentration in the leaves and fruit. The most economical dose was 45.40 Kg K 2O ha in the 2016/17 crop. It was not possible to estimate K critical levels in the soil and leaves. The fruits submitted to higher doses of K showed the lowest values of ethylene production and respiration rate, which resulted in an increase in storage life in cold rooms and on the shelves.	
Palavras-Chave: 	exchangeable K; fruit; total 20 titratable acidity.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_45594.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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