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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

EXTRACTANTS TO ASSESS ZINC PHYTOAVAILABILITY IN MINERAL FERTILIZER AND INDUSTRIAL BY-PRODUCTS

Texto completo
Autor(es):
Cenciani de Souza, Camila Prado [1] ; de Abreu, Cleide Aparecida [2] ; de Andrade, Cristiano Alberto [3] ; de Abreu, Monica Ferreira [4]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Ctr Soil & Environm Resources IAC. BR-13012970 Campinas
[2] Ctr Soil & Environm Resources IAC. BR-13012970 Campinas
[3] Embrapa Environm. BR-13820000 Jaguariuna
[4] Ctr Soil & Environm Resources IAC. BR-13012970 Campinas
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Revista Brasileira de Ciência do Solo; v. 37, n. 4, p. 1004-1017, JUL-AUG 2013.
Citações Web of Science: 4
Resumo

Efficient analytical methods for the quantification of plant-available Zn contained in mineral fertilizers and industrial by-products are fundamental for the control and marketing of these inputs. In this sense, there are some doubts on the part of the scientific community as well as of the fertilizer production sector, whether the extractor requested by the government (Normative Instruction No. 28, called 2nd extractor), which is citric acid 2 % (2 % CA) (Brasil, 2007b), is effective in predicting the plant availability of Zn via mineral fertilizers and about the agronomic significance of the required minimal solubility of 60 % compared to the total content (HCl) (Brasil, 2007a). The purpose of this study was to evaluate the alternative extractors DTPA, EDTA, neutral ammonium citrate (NAC), buffer solution pH 6.0, 10 % HCl, 10 % sulfuric acid, 1 % acetic acid, water, and hot water to quantify the contents of Zn available for maize and compare them with indices of agronomic efficiency of fertilizers and industrial by-products when applied to dystrophic Clayey Red Latosol and Dystrophic Alic Red Yellow Latosol with medium texture. The rate of Zn applied to the soil was 5 mg kg(-1), using the sources zinc sulfate, commercial granular zinc, ash and galvanic sludge, ash and two brass slags. Most Zn was extracted from the sources by DTPA, 10 % HCl, NAC, 1% acetic acid, and 10 % sulfuric acid. Recovery by the extractors 2 % CA, EDTA, water, and hot water was low. The agronomic efficiency index was found to be high when using galvanic sludge (238 %) and commercial granular zinc (142 %) and lower with brass slag I and II (67 and 27 %, respectively). The sources galvanizing ash and brass ash showed solubility lower than 60 % in 2 % CA, despite agronomic efficiency indices of 78 and 125 %, respectively. The low agronomic efficiency index of industrial by-products such as brass slag I and galvanizing ash can be compensated by higher doses, provided there is no restriction, as well as for all other sources, in terms of contaminant levels of arsenic, cadmium, chromium, lead, and mercury as required by law (Normative Instruction No 27/2006). The implementation of 2nd extractor 2 % CA and the requirement of minimum solubility for industrial byproducts could restrict the use of alternative sources as potential Zn sources for plants. (AU)

Processo FAPESP: 09/01946-0 - Disponibilidade de cobre e zinco em fertilizantes minerais
Beneficiário:Cleide Aparecida de Abreu
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/04076-3 - Disponibilidade de cobre e zinco em fertilizantes minerais
Beneficiário:Camila Prado Cenciani de Souza
Linha de fomento: Bolsas no Brasil - Mestrado