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All publications of “Maria Betânia Galvão dos Santos Freire”

9 results

Nitrate Reductase Activity and Nitrogen and Biomass Accumulation in Sugarcane under Molybdenum and Nitrogen Fertilization

Renato Lemos dos Santos, Fernando José Freire, Emídio Cantídio Almeida de Oliveira, Maria Betânia Galvão dos Santos Freire ORCID logo , Jason Brossard West, José de Arruda Barbosa, [...]


ABSTRACT Prior research on sugarcane showed increment of productivity following molybdenum (Mo) fertilization and some indication of the potential role either on nitrate reductase activity (NRA). However, this increment can depend on sugarcane variety and nitrogen (N) fertilization. This study aimed to evaluate the effect of Mo fertilization on Mo uptake, on NRA, nitrate (NO3–-N), and ammonium (NH4+-N) contents in leaves and roots of sugarcane, and the accumulation of N and biomass across two sugarcane varieties (RB 867515 and RB […]

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Biological indicators of two soils with incorporation of a byproduct from the coffee agroindustry

Karoline de Melo Padilha, Maria Betânia Galvão dos Santos Freire, Gustavo Pereira Duda, Uemeson José dos Santos, Aline Oliveira Silva, Edivan Rodrigues de Souza


The addition of organic residue byproducts in the soil may lead to changes in the dynamics of soil organic matter, influencing the activity and the use of C by microorganisms in the soil. The aim of this study was to evaluate the influence of the application of increasing rates of a byproduct from a coffee agroindustry on the biological properties of two soils with different clay contents as a function of incubation time. A randomized block experimental design was used […]

Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil

Jailson Cavalcante Cunha, Hugo Alberto Ruiz, Maria Betânia Galvão dos Santos Freire, Víctor Hugo Alvarez V., Raphael Bragança Alves Fernandes


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 […]

Nutrient uptake and use efficiency of elephant grass in the presence of crude gypsum

Renato Lemos dos Santos, Vinícius Mendes de Azevedo, Fernando José Freire, Alexandre Tavares da Rocha, José Alves Tavares, Maria Betânia Galvão dos Santos Freire


The cultivation of Elephant or Napier grass (Pennisetum purpureum) in the gypsum- producing region of Araripe, in the west of the state of Pernambuco in northeastern Brazil, may be viable as alternative energy, especially when the soil fertility is improved. The objective of this study was to evaluate the effect of crude gypsum on the nutritional status, mineral composition, biomass production, and nutrient uptake efficiency of elephant grass varieties in Araripe, Pernambuco. For this purpose, three elephant grass varieties: Cameroon, […]

Fractions of organic carbon in a humic oxisol under different uses in the agreste region of brazil

Priscila Maria de Aquino Pessoa, Gustavo Pereira Duda, Raquel Bezerra de Barros, Maria Betânia Galvão dos Santos Freire, Clístenes Willians Araújo do Nascimento, Marcelo Metri Correa


The conversion of natural vegetation to cultivated land often results in changes in the quantity and quality of soil organic matter. The magnitude of these alterations varies according to the soil properties, climate, crops and soil management. Soil organic C is not always a sensitive indicator of soil changes. The distribution of C fractions is therefore being used to assess the soil organic matter quality more precisely. This study evaluated the changes in organic C fractions of a Humic Oxisol […]

Nutrient extraction and export by fully irrigated sugarcane varieties

Emídio Cantídio Almeida de Oliveira, Fernando José Freire, Ruthanna Isabelle de Oliveira, Maria Betânia Galvão dos Santos Freire, Djalma Euzébio Simões Neto, Silas Alves Monteiro da Silva


A review of technology research supporting the Brazilian sugaralcohol sector shows that only sporadic studies with irrigated sugarcane have been developed to investigate nutritional requirements. In this context, the objective of this study was to quantify the capacity of extraction and export of N, P, K, Ca, and Mg as well as the nutritional requirement for the production of one ton of stalk per hectare (TCH) in the plant cane cycle of 11 sugarcane varieties (SP79-1011, RB813804, RB863129, RB872552, RB943365, […]

Soil chemical properties under different uses in an irrigated area in the semi arid region of Pernambuco, Brazil

Rossini Mattos Corrêa, Maria Betânia Galvão dos Santos Freire, Rinaldo Luiz Caraciolo Ferreira, Fernando José Freire, Luiz Guilherme Medeiros Pessoa, Marcelo Alves Miranda, [...]


Soils developed at semi-arid climate can present salt accumulation, which compromise the agricultural use, being increased by inadequate irrigation management. Based on the use, the degradation of these soils can occur at higher or smaller intensity. This study aimed to evaluate the effect of soil uses based on physical and chemical properties of an irrigated area in the semi-arid region of northeastern Brazil. The soil uses were annual crops (C), fruticulture (F), pasture (P), discarded lands (D), or native vegetation […]

Chemical and physical fractions of soil organic carbon in a forest soil currently under different uses

Arlete Côrtes Barreto, Maria Betania Galvão dos Santos Freire, Paulo Gabriel Soledade Nacif, Quintino Reis Araújo, Fernando José Freire, Euzelina dos Santos Borges Inácio


Organic matter may be considered an important soil quality indicator, as it is related with many soil chemical, physical, and biological characteristics. The study of total organic carbon (TOC) of the soil and its fractions is important. This study was conducted in a micro basin, with the purpose of: analyzing characteristics and quantify the stocks of total organic carbon (TOC) and its fractions as evidence of soil quality after different forms of use: (1) Atlantic Forest, (2) Cocoa (Theobroma cacao), […]

Use of Atriplex nummularia and gypsum for phytoremediation of saline-sodic soil

Isaac Gomes Leal, Adriana Maria de Aguiar Accioly, Clístenes Williams Araújo do Nascimento, Maria Betânia Galvão dos Santos Freire, Abelardo Antônio de Assunção Montenegro, Fabiana de Lima Ferreira


The cultivation of Atriplex nummularia on saline-sodic soils is economically attractive because it can be used as a forage crop as well as in landscape projects. The potential of Atriplex nummularia for phytoextraction of Na+ from a saline-sodic soil irrigated with saline water was evaluated. Additionally, gypsum was tested for improving phytoremediation. The experiment was set up as a randomized block design, in a 2 x 3 factorial scheme. The treatments consisted of: no gypsum and 50 % of the […]