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| Registros recuperados: 31 | |
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| Lima,Sandra Santana; Ceddia,Marcos Bacis; Zuchello,Fernando; Aquino,Adriana Maria de; Mercante,Fábio Martins; Alves,Bruno José Rodrigues; Urquiaga,Segundo; Martius,Christopher; Boddey,Robert Michael. |
| Epigeous termite mounds are frequently observed in pasture areas, but the processes regulating their population dynamics are poorly known. This study evaluated epigeous termite mounds in cultivated grasslands used as pastures, assessing their spatial distribution by means of geostatistics and evaluating their vitality. The study was conducted in the Cerrado biome in the municipality of Rio Brilhante, Mato Grosso do Sul, Brazil. In two pasture areas (Pasture 1 and Pasture 2), epigeous mounds (nests) were georeferenced and analyzed for height, circumference and vitality (inhabited or not). The area occupied by the mounds was calculated and termite specimens were collected for taxonomic identification. The spatial distribution pattern of the mounds was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Termites; Isoptera; Geostatistics; Spatial distribution. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100049 |
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| Balieiro,Fabiano de Carvalho; Pereira,Marcos Gervasio; Alves,Bruno José Rodrigues; Resende,Alexander Silva de; Franco,Avílio Antonio. |
| In spite of the normally low content of organic matter found in sandy soils, it is responsible for almost the totality of cation exchange capacity (CEC), water storage and availability of plant nutrients. It is therefore important to evaluate the impact of alternative forest exploitation on the improvement of soil C and N accumulation on these soils. This study compared pure and mixed plantations of Eucalyptus grandis and Pseudosamanea guachapele, a N2-fixing leguminous tree, in relation to their effects on soil C and N stocks. The studied Planosol area had formerly been covered by Panicum maximum pasture for at least ten years without any fertilizer addition. To estimate C and N contents, the soil was sampled (at depths of 0-2.5; 2.5-5.0; 5.0-7.5;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mixed plantations; Pseudosamanea guachapele; Eucalyptus grandis; Soil organic matter; 13C natural abundance. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000300033 |
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| Resende,Alexander Silva de; Santos,Adriano; Xavier,Rogério Pontes; Coelho,Celso Henrique; Gondim,Antônio; Oliveira,Octávio Costa; Alves,Bruno José Rodrigues; Boddey,Robert Michael; Urquiaga,Segundo. |
| As práticas da queima, aplicação de vinhaça e fertilizante nitrogenado são comuns na cultura de cana-de-açúcar. No entanto, estudos de longa duração são pouco encontrados na literatura. Neste trabalho, realizado na Usina Cruangi, Timbaúba, PE, transição entre a Zona da Mata e o Agreste daquele Estado, objetivou-se avaliar o efeito da aplicação de N (80 kg ha-1 na forma de uréia), da vinhaça (80 m³ ha-1) e da queima (com ou sem queima) da palhada antes do corte, entre 1983 e 1999, em características tecnológicas da cultura de cana-de-açúcar. O delineamento experimental foi o de blocos ao acaso, em esquema fatorial completo 2 x 2 x 2, e quatro repetições. O experimento teve duas fases: a primeira, de 1983-1992, e a segunda, de 1992-1999. A aplicação de N... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cana crua; Açúcar; Adubação. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832006000600003 |
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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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| Ricci,Marta dos Santos Freire; Alves,Bruno José Rodrigues; Miranda,Simone Cordeiro de; Oliveira,Fabio Freire de. |
| In view of the low N concentration in organic fertilizers, it is necessary to use high rates of such fertilizers to attend coffee crop requirements. Hence, N is the most limiting nutrient for organic coffee production. The objective of this work was to evaluate the influence of sunn hemp (Crotalaria juncea) organic fertilization on the growth and nutritional status of coffee cultivars, as well as to quantify plant biomass and N input derived from biological nitrogen fixation, and their effect on soil chemical characteristics. The experiment consisted of six coffee (Coffea arabica) cultivars intercropped with and without sunn hemp sown in November 2001 and pruned at mid-height 76 days later. At 175 days, the standing biomass of the legume was cut, measuring... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Crotalaria juncea; Biological nitrogen fixation; Nutrient input; Green manure. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200008 |
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| Guimarães,Ana Paula; Morais,Rafael Fiusa de; Urquiaga,Segundo; Boddey,Robert Michael; Alves,Bruno José Rodrigues. |
| In commercial plantations of soybean in both the Southern and the Cerrado regions, contributions from biological nitrogen fixation (BNF) are generally proportionately high. When using the 15N natural abundance technique to quantify BNF inputs, it is essential to determine, with accuracy, the 15N abundance of the N derived from BNF (the 'B' value). This study aimed to determine the effect of four recommended strains of Bradyrhizobium spp. (two B. japonicum and two B. elkanii) on the 'B' value of soybean grown in pots in an open field using an equation based on the determination of δ15N natural abundance in a non-labelled soil, and estimate of the contribution of BNF derived from the use of 15N-isotope dilution in soils enriched with 15N. To evaluate N2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bradyrhizobium elkanii; Bradyrhizobium japonicum; Glycine max; 'B' value. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500011 |
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| Oliveira,Ana Paula Pessim; Alves,Bruno José Rodrigues; Anjos,Lúcia Helena Cunha dos; Lima,Eduardo; Zonta,Everaldo; Pereira,Willian; Soares,Paula Fernanda Chaves. |
| ABSTRACT The recent approach of eliminating the usage of fire for sugarcane harvesting resulted in managing the crop on a trashblanketed soil, to which a proper recommendation of N fertilization is lacking, a problem that remains in the coastal tablelands of the Espírito Santo State, Brazil. This study aimed at evaluating the effect of increasing N rates on stalk and sugar yields and the N use efficiency by the crop. The experimental area planted with sugarcane, at the first ratoon, is located in Linhares, Espírito Santo State. The treatments consisted of N rates varying from 80 to 160 kg N∙ha−1 as ammonium sulphate, and a control without N, in a completely randomized blocks experimental design. Stalk yield increased with the N rate, and fitting the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Sugarcane harvesting systems; Nitrogen requirements. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000200246 |
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| Ramalho,Israel Oliveira; Rezende,Claudia de Paula; Pereira,José Marques; Macedo,Robert de Oliveira; Santos,Camila Almeida dos; Monteiro,Rafael Cassador; Alves,Bruno José Rodrigues; Carvalho,Isabel das Neves Oiticica de; Urquiaga,Segundo; Boddey,Robert Michael. |
| ABSTRACT: The objectives of this study were to determine the rates of plant litter deposition and decomposition in Marandu pastures (Urochloa brizantha cv. Marandu) under a) three forms of nitrogen (N) supply, b) at different stages of rotational grazing and c) to compare the single-exponential decay constant (‘k’) derived from litterbags with values derived from estimates of deposited and existing litter (DEL technique). The three N supply treatments were: without or with N fertilization (zero or 150 kg N ha-1 yr-1) or with the legume Desmodium ovalifolium. There were no significant differences (p<0.05) between existing litter and rates of litter deposition and decomposition between the three N supply treatments. The litter decomposition rate was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urochloa brizantha; Decomposition constant; Methodological comparison. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200202 |
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| Registros recuperados: 31 | |
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