Data/hora: 17/06/2024 19:28:13

Provedor de dados: 	Scientia Agricola	
País: 	Brazil	
Título: 	Efficiency of foliar application of sparingly soluble sources of boron and zinc in citrus	
Autores: 	Macedo,Luiza Oliveira; Mattos Júnior,Dirceu; Jacobassi,Rodrigo; Hippler,Franz Walter Rieger; Quaggio,José Antônio; Boaretto,Rodrigo Marcelli.	
Data: 	2021-01-01	
Ano: 	2021	
Palavras-chave: 	Micronutrients; Microparticles; Leaf spraying; Fertilizer use.	
Resumo: 	ABSTRACT This study evaluated leaf supply of zinc (Zn) and boron (B) using either soluble or sparingly soluble fertilizers in young sweet orange trees. Three experiments were set up in a greenhouse to compare two sources and four doses (control, low, adequate and high) of fertilizers as follows: (i) Experiment I (B): boric acid and calcium borate; (ii) Experiment II (Zn): Zn sulfate and Zn oxide; and (iii) Experiment III (B + Zn): boric acid + Zn Sulfate and Zn Borate. The sparingly soluble sources were effective in increasing the Zn and B leaf concentration. Dry matter of the aerial part increased 18 % with B applications in adequate concentration independent of the B fertilizer sources. In contrast, trees did not grow well with applications of adequate concentration of Zn as Zn Sulfate or high Zn concentration as Zn borate. Superoxide dismutase activity in leaves increased with applications of low concentration of Zn as Zn oxide and decreased with high concentration of Zn from either source. Polyphenol oxidase activity increased with application of adequate concentration of B as boric acid and high concentration of B as calcium borate. Furthermore, the upper concentrations of Zn were toxic in orange trees when the source was Zn sulfate. Increases in plant growth without damage to leaf tissue and positive responses of key enzymes of orange trees in a range of nutrient concentration applications demonstrated the practical use of sparingly soluble fertilizers to supplying B and Zn foliarily to plants.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101401	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/1678-992x-2018-0387	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.78 n.1 2021	
Fonte: 	info:eu-repo/semantics/openAccess