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| Pimentel,Márcio Sampaio; De-Polli,Helvécio; Aquino,Adriana Maria de; Correia,Maria Elizabeth Fernandes; Rouws,Janaina Ribeiro Costa. |
| The objective of this work was to assess the effect of different coffee organic cultivation systems on chemical and biological soil characteristics, in different seasons of the year. The following systems were evaluated: coffee intercropped with one (CJ1), two (CJ2) or three (CJ3) pigeon pea (Cajanus cajan) alleys; coffee planted under full sun (CS); area planted with sweet pepper and snap bean in a conventional tillage system (AC); and secondary forest area (FFR). Row spacing in CJ1, CJ2, CJ3 and CS was 2.0x1.0, 2.8x1.0, 3.6x1.0, and 2.8x1.0 m, respectively. Soil samples were collected at 10-cm depth, during the four seasons of the year. The results were subjected to analysis of variance, principal component analysis, and redundancy analysis. There was an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cajanus cajan; Coffea arabica; Edaphic macrofauna; Metabolic quotient; Shading; Soil microbial biomass. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000500013 |
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| Machado,Roriz Luciano; Carvalho,Daniel Fonseca de; Rouws,Janaina Ribeiro Costa; Gomes,Daniela Pinto; Eduardo,Eliete Nazare. |
| O conhecimento da erosividade das chuvas associada à probabilidade de ocorrência e ao período de retorno pode contribuir para o planejamento conservacionista de uma região, em médio e longo prazo. A fim de gerar informações para melhor utilizar modelos e controle da erosão, dados de chuvas de 30 séries pluviográficas e pluviométricas, abrangendo 25 municípios, entre 1933 e 2006, foram estudados quanto à adequação das séries e do cálculo da probabilidade de ocorrência teórica (P) e período de retorno (T) da erosividade das chuvas (EI30 e KE>25), para o Estado do Rio de Janeiro. Foi feita a espacialização do potencial erosivo associado aos períodos de retorno de 2, 5, 10, 20, 50 e 100 anos para todo o Estado. A erosividade anual média (EI30) ou fator R da... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservação do solo; USLE; Recorrência da erosividade. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200024 |
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| Machado,Roriz Luciano; Carvalho,Daniel Fonseca de; Rouws,Janaina Ribeiro Costa; Almeida,Wilk Sampaio de; Oliveira,Paulo Tarso Sanches de. |
| 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 (PCA) and canonical discriminant analysis (CDA). Based on evaluation of the respective historical series of hyetographs, it was found that the advanced pattern occurs with highest frequency (51.8 %),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water erosion; EI30; Canonical discriminant analysis. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100535 |
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| Zilli,Jerri Édson; Gianluppi,Vicente; Campo,Rubens José; Rouws,Janaina Ribeiro Costa; Hungria,Mariangela. |
| A fixação biológica de N é indispensável à soja no Brasil, dispensando o uso de N mineral e reduzindo o custo de produção. O objetivo deste estudo foi comparar a inoculação da soja com Bradyrhizobium no sulco de semeadura com a inoculação tradicional nas sementes, em solo com baixo teor de matéria orgânica e desprovido de bactérias nodulantes dessa cultura. Foi conduzido um experimento de campo no cerrado de Roraima no ano de 2006 e repetido nas mesmas condições em 2007, sendo avaliados os tratamentos: controle sem inoculação e sem N mineral, 200 kg ha-1 de N na forma de ureia e os métodos de inoculação no sulco de semeadura e inoculação nas sementes, sendo cada método avaliado em sementes sem tratamentos com fungicidas e com a aplicação de carboxin+tiram... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Fungicida; FBN; Cerrado. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600011 |
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| Rocha,Adriano Alvim; Araújo,Ednaldo da Silva; Santos,Silvio da Silva; Goulart,Jhonatan Marins; Espindola,José Antonio Azevedo; Guerra,José Guilherme Marinho; Alves,Bruno José Rodrigues; Rouws,Janaina Ribeiro Costa. |
| 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 four organic fertilizers (castor bean cake, bokashi, legume fertilizers, cattle manure), at rates of 200 kg ha-1 N, and a control treatment (without fertilization), and the subplots corresponded to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: NH3 volatilization; Organic fertilization; Nitrogen dynamics. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100518 |
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| Macedo,Robert; Tarré,Ricardo Martinez; Ferreira,Elvino; Rezende,Claudia de Paula; Pereira,José Marques; Cadisch,Georg; Rouws,Janaina Ribeiro Costa; Alves,Bruno José Rodrigues; Urquiaga,Segundo; Boddey,Robert Michael. |
| A key contribution to study the cycling of nutrients in soil/plant/animal systems is the evaluation of the consumption of forage and their nutrients by cattle. The objective of this study was to test techniques to evaluate faecal production, in vitro digestibility, forage consumption and the proportion of legume in the acquired diet. Five Zebu steer calves were confined and fed five diets of different combinations of Brachiaria dictyoneura and Desmodium ovalifolium. All quantities of faeces were collected per animal and these values were found to compare favourably with those derived from using the chromium oxide technique. In vitro digestibility ranged from 7 to 10% higher than the actual in vivo digestibility. Faecal samples from steers fed with diets... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria dictyoneura; Desmodium ovalifolium; 13C abundance; Digestibility; Forage intake. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400002 |
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