Fruit quality of West Indian cherry under saline water irrigation and nitrogen-potassium fertilization/Qualidade de frutos de aceroleira irrigada com aguas salinas e adubacao com nitrogenio-potassio.

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Publisher: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
Document Type: Article
Length: 5,925 words

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Abstract :

HIGHLIGHTS: The decrease in the size of West Indian cherry fruit reflects the diversion of energy to maintain metabolic activities. The pH reduction is related to an increase in the total titratable acidity of West Indian cherry pulp. Water salinity above 0.3dSm (1) inhibits the synthesis of bioactive compounds in West Indian cherry fruits. The presence of waters with high salt concentration stands out as a limiting factor for the quality of agricultural production. Thus, this study aimed to evaluate the fruit quality of West Indian cherry cv. Flor Branca, subjected to irrigation with water of different salinity levels and combinations of nitrogen-potassium fertilization, between 630 and 750 days after transplanting in the field. A randomized block design was used in a 5 x 4 factorial arrangement, with three replicates, whose treatments consisted of five values of electrical conductivies of irrigation water -ECw (0.3,1.3,2.3,3.3 and 4.3 dSrrr1) and four combinations of nitrogen and potassium fertilization (70-50, 100-75, 130-100 and 160-125% of recommendation of N and K2O, respectively). Electrical conductivity of irrigation water above 0.3 dS rrr1 reduces the polar and equatorial diameters, hydrogen potential and flavonoid concentration and increases titratable acidity in West Indian cherry fruits. N-K2O combination of 70/50% of fertilizer recommendation reduces the effect of salt stress of irrigation water on the anthocyanin concentration in the fruits at ECw of 1.3 dS rrr (1) and ascorbic acid at ECw of 3.3 and 4.3 dS rrr (1) . Keywords: Malpighia emarginata Sesse & Moc. ex DC, salt stress, plant nutrition, post-harvest A presenca de aguas com elevados concentracoes de sais se destaca como fator limitante da qualidade da producao agricola. Assim, objetivou-se com este estudo avaliar a qualidade de frutos da aceroleira cv. Flor Branca, submetida a irrigacao com diferentes niveis de aguas salinas e combinacoes de adubacao com nitrogenio-potassio, entre 630 e 750 dias apos o transplantio a campo. Utilizou-se delineamento de blocos ao acaso em arranjo fatorial 5*4, com tres repeticoes, cujos tratamentos foram cinco condutividades eletricas da agua - CEa (0,3; 1,3; 2,3; 3,3 e 4,3 dS [m.sup.1]) e quatro combinacoes de adubacao com nitrogenio e potassio: 70-50; 100-75; 130-100 e 160-125% da recomendacao de N e K2O, respectivamente. A CEa acima de 0,3 dS rrr (1) diminuiu o diametro polar e equatorial, potencial hidrogenionico, teores de flavonoides e aumentou a acidez titulavel nos frutos de aceroleira. A combinacao de 70-50% da recomendacao de N e KO, diminuiu o efeito do estresse salino da agua de irrigacao sobre o teor de antocianina nos frutos na CEa de 1,3 dS rrr (1), e acido ascorbico, nas salinidades de 3,3 e 4,3 dS [m.sup.1]. Palavras-chave: Malpighia emarginata Sesse & Moc. ex DC, estresse salino, nutricao de plantas, pos-colheita

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Gale Document Number: GALE|A674989392