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All publications of “Janaina Ribeiro Costa Rouws”

5 results

Ammonia Volatilization from Soil-Applied Organic Fertilizers

Adriano Alvim Rocha, Ednaldo da Silva Araújo ORCID logo , Silvio da Silva Santos, Jhonatan Marins Goulart, José Antonio Azevedo Espindola, José Guilherme Marinho Guerra, [...]


ABSTRACT: A reliable quantification of nitrogen (N) losses by ammonia (NH3) volatilization can contribute to identifying optimized strategies of fertilizer management. The objective of this study was to quantify ammonia volatilization from several organic N sources incorporated into or applied onto the soil surface. Two cultivation areas, under snap bean and corn, were evaluated at Embrapa Agrobiology, Seropédica, Rio de Janeiro (RJ). Both experiments used a randomized complete block design in split-plots, with four replications. The main plots consisted of […]

Multivariate Analysis of Erosivity Indices and Rainfall Physical Characteristics Associated with Rainfall Patterns in Rio de Janeiro

Roriz Luciano Machado, Daniel Fonseca de Carvalho, Janaina Ribeiro Costa Rouws, Wilk Sampaio de Almeida, Paulo Tarso Sanches de Oliveira


ABSTRACT The identification of areas with greater erosive potential is important for planning soil and water conservation. The objective of this study was to evaluate the physical characteristics of rainfall events in the state of Rio de Janeiro, Brazil, and their interactions with rainfall patterns through multivariate statistical analysis. Rainfall depth, kinetic energy, 30-min intensity (I30), duration of rainfall events, and the erosivity indices KE >10, KE >25, and EI30 in 36 locations (stations) were subjected to principal component analysis […]

Oxidizable fractions of total organic carbon and soil macrofauna in a crop-livestock integration system

Itaynara Batista, Maria Elizabeth Fernandes Correia, Marcos Gervasio Pereira, Wanderlei Bieluczyk, Jolimar Antonio Schiavo, Janaína Ribeiro Costa Rouws


The increasing level of land degradation has led to the adoption of agricultural management practices that seek to combine agricultural production and soil conservation. Among these, the practice of Crop-Livestock Integration (CLI) has intensified in West-Central Brazil. In order to assess the long-term effect of the CLI system and seasonality on the community of soil macrofauna and oxidizable fractions of total organic C in croplands and the Cerradão (Brazilian tropical savanna), a study was developed at the Cabeceira Farm in […]

Rainfall erosivity associated to return periods and occurrence probability in the state of rio de janeiro, brazil

Roriz Luciano Machado, Daniel Fonseca de Carvalho, Janaina Ribeiro Costa Rouws, Daniela Pinto Gomes, Eliete Nazare Eduardo


Knowledge on rainfall erosivity associated to occurrence probability and return periods can contribute to conservation planning in the medium and long term. With the objective of generating information for a better use of medium and long-term erosion models and erosion control, rainfall data of 30 pluviometric and pluviographic data sets from 25 cities ranging from 1933 to 2006 were studied in terms of adjustment of data sets, calculation of the probability of theoretical occurrence (P) and return period (T) of […]

In-furrow inoculation with Bradyrhizobium alternatively to seed inoculation of soybean

Jerri Édson Zilli, Vicente Gianluppi, Rubens José Campo, Janaina Ribeiro Costa Rouws, Mariangela Hungria


Biological N fixation in soybean is indispensable in Brazil, sparing the use of mineral N and reducing crop production costs. The objective of this study was to compare in-furrow inoculation of soybean with Bradyrhizobium to the traditional practice of seed inoculation, in an experiment performed in a soil with low organic matter content and without soybean-nodulating rhizobia. A field experiment was carried out in the Cerrado of Roraima in 2006 and repeated in 2007, with the treatments: (1) control (no […]