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| Cunha,Jailson Cavalcante; Ruiz,Hugo Alberto; Freire,Maria Betânia Galvão dos Santos; Alvarez V.,Víctor Hugo; Fernandes,Raphael Bragança Alves. |
| The electrical charges in soil particles are divided into structural or permanent charges and variable charges. Permanent charges develop on the soil particle surface by isomorphic substitution. Variable charges arise from dissociation and association of protons (H+), protonation or deprotonation, and specific adsorption of cations and anions. The aim of this study was to quantify the permanent charges and variable charges of Reference Soils of the State of Pernambuco, Brazil. To do so, 24 subsurface profiles from different regions (nine in the Zona da Mata, eight in the Agreste, and seven in the Sertão) were sampled, representing approximately 80 % of the total area of the state. Measurements were performed using cesium chloride solution. Determination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clays; Cation exchange capacity; Structural charges; PH dependent charges. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400012 |
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| Dias,Dayanne do Nascimento; Sousa,Karla dos Santos Melo de; Lima,Augusto Miguel Nascimento; Cavalcante,Ítalo Herbert Lucena; Santos,Laura Paula Araújo dos; Cunha,Jailson Cavalcante. |
| Abstract Information on humic substances (HS) associated with nitrogen fertilization in West Indian cherry is scarce in the literature. The use of soil conditioners, such as HS, can increase the efficiency in the absorption of nutrients, especially N. Therefore, the present study aimed to evaluate, in two production cycles, the fruit quality, yield and nutritional status of West Indian cherry as a function of fertigation with nitrogen (N) and HS in Petrolina-PE, Brazil. The experimental design was in split plots, with treatments distributed in 5 x 2 strips, referring to N doses (50, 75, 100, 125 and 150% of the recommended dose) and HS application (without and with), respectively, with 4 replicates and 3 plants per plot. The N source used was urea (45% N)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malpighia emarginata; Plant nutrition; Nitrogen fertilization; Humic acid; Production. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000203002 |
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