|
|
|
| Registros recuperados: 55 | |
|
|
| ALMEIDA,Everton José; LUIZÃO,Flávio; RODRIGUES,Domingos de Jesus. |
| Nutrient recycling in the forest is linked to the production and decomposition of litter, which are essential processes for forest maintenance, especially in regions of nutritionally poor soils. Human interventions in forest such as selecttive logging may have strong impacts on these processes. The objectives of this study were to estimate litterfall production and evaluate the influence of environmental factors (basal area of vegetation, plant density, canopy cover, and soil physicochemical properties) and anthropogenic factors (post-management age and exploited basal area) on this production, in areas of intact and exploited forest in southern Amazonia, located in the northern parts of Mato Grosso state. This study was conducted at five locations and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Transition forest; Nutrient cycling; Selective logging; Forest management. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000200157 |
| |
|
| |
|
|
| Balota, Elcio Liborio; Instituto Agronômico do Paraná; Machineski, Oswaldo; Instituto Agronômico do Paraná; Truber, Priscila Viviane; Instituto Agronômico do Paraná. |
| The objective of this work was to evaluate the changes in soil enzyme activities due to application of pig slurry under different soil tillage systems. The experiment was conducted in a clayey Oxisol in Palotina, PR, using different quantities of pig slurry (0, 30, 60 and 120 m3 ha-1 year-1) applied to the soil prior to the summer and winter crop season under conventional tillage (CT) and no tillage (NT), with three replicates. The areas were cultivated with soybean (Glycine max L.) and maize (Zea mays L.) in the summers of 1998 and 1999, respectively, and with wheat (Triticum sativum Lam.) in the winters of both years. The soil samples were collected in March and October of 1998 and 1999 at depths of 0-5, 5-10 and 10-20 cm. The pig slurry application and... |
| Tipo: Pesquisa de Campo |
Palavras-chave: Agrárias Microbiologia e Bioquimica do Solo Arylsulfatase; Acid phosphatase; Swine manure; No-tillage systems; Nutrient cycling Arylsulfatase; Acid phosphatase; Swine manure; No-tillage systems; Nutrient cycling. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/9816 |
| |
|
|
| Machado, Murilo Rezende; Sampaio, Paulo de Tarso Barbosa; Ferraz, João; Camara, Rodrigo; Pereira, Marcos Gervasio. |
| Internal retranslocation is an important mechanism for nutrient conservation in plants, which depends on different factors. However, there are little data about this subject, especially on tropical forest species. This study aimed to evaluate the macronutrient retranslocation dynamic and the influence of ecological (P: pioneer x NP: non-pioneer) and phenological (ND: non-deciduous x D: semideciduous / deciduous) characteristics on the macronutrient content of leaves of five tree species on monospecific plantations in the Brazilian Amazon: Acacia mangium Willd., Parkia decussata Ducke, Dipteryx odorata (Aublet) Willd., Jacaranda copaia (Aubl.) D. Don and Swietenia macrophylla King. Photosynthetically active green leaves and senescent leaves (leaf litter)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.00.00.00-4 ecological groups; Litterfall; Nutrient cycling; Phenological groups; Plant nutrition Fertilidade do Solo e Adubação. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/26805 |
| |
|
|
| Teixeira, Cícero Monti; EPAMIG; Carvalho, Gabriel José de; UFLA; Andrade, Messias José Bastos de; UFLA; Furtini Neto, Antônio Eduardo; UFLA. |
| O consórcio entre gramíneas e leguminosas para produção de palha, no sistema plantio direto, visa conciliar a proteção do solo, por meio da maior durabilidade da gramínea, com a fixação de N e disponibilização mais rápida de nutrientes pela decomposição da leguminosa. Diante disso, instalou-se um experimento para determinar a produção de fitomassa e o teor e acúmulo de micronutrientes do milheto, feijão-de-porco e guandu-anão, em cultivo solteiro e nos consórcios da gramínea com as leguminosas, para a produção de palha no plantio direto. O trabalho foi conduzido no campo experimental do Departamento de Agricultura da Universidade Federal de Lavras – Lavras, Estado de Minas Gerais. O delineamento foi o de blocos casualizados, com sete tratamentos, para os... |
|
Palavras-chave: 5.01.00.00-9 Agronomia plantio direto; Adubação verde; Micronutrientes; Ciclagem de nutrientes. no-tillage; Green manuring; Micronutrients; Nutrient cycling. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5314 |
| |
|
| |
|
| |
|
|
| Brito,Letícia da Silva; Irmler,Ulrich; Forte,Bruno Vasconcelos Guimarães; Xavier,Tatiane Pereira; Martins,Rodrigo Lemes. |
| Abstract: Restingas are sandy areas spread along the Brazilian coast made up of a mosaic of forest and open woodland vegetation adapted to varying conditions of aridity, oligotrophy and salinity. Two vegetation types are very common in southeast Brazilian restingas, open Clusia formations and seasonally dry forest formation. Litter production and nutrient (C and N) turnover were studied comparatively in forest formations and Clusia formations, in vegetation patches with and without Clusia hilariana. The results showed that the breakdown process is extremely retarded in Clusia formations, with or without C. hilariana, leading to C accumulation in the soil. Microbial and soil fauna activity is lower in Clusia formations in comparison to forest formations;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coastal ecosystem; Decomposition litterfall; Nutrient cycling; Nurse plant. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000400208 |
| |
|
|
| THOMAZ,S. M.; PEREIRA,G.; PAGIORO,T. A.. |
| Four size fractions of the sediment of six environments of the upper Paraná River floodplain were analyzed for carbon, nitrogen, and phosphorus contents and microbial respiration (oxygen consumption). Particle size did not affect nitrogen and phosphorus content or microbial activity, but did affect carbon content (F = 4.274, df = 3; 20, p = 0.020). The carbon concentration of ultra-fine particles was significantly lower than that of other sizes of sediment particles. Microbial respiration values were well predicted by sediment chemical composition, as shown by multiple regression (microbial respiration = -0.39 - 0.210C + 0.108N + 0.796P; F = 7.0495, p = 0.0022). However, phosphorus was the element which best explained the microbial respiration (partial... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microbial respiration; Nutrient cycling; Floodplain; Sediment fractions; Paraná River. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200010 |
| |
|
|
| Tedesco,Marino José; Lauschner,Márcio Henrique; Gianello,Clesio; Bortolon,Leandro; Kray,Claudio Henrique. |
| Brazil is one of the leaders in the production and trading of tobacco leaves in the global market, which results in a large amount of residues that would be recycled and used as soil fertilizers in agriculture. This research aimed to study the land disposal potential and agricultural use of tobacco processing residues (TPRs), their mineralization and the nutrient supply to the plants. The study was carried out in an open area using pots with 32dm³ of a sandy soil (Paleudult), provided with water drainage collectors and tilled with three corn plants each. Eighteen treatments were tested with mineral fertilization, poultry manure (PM), earthworm compost (EC) and increasing rates (0, 7.5, 15, 30 e 60t ha-1) of TPR D (dust) and TPR S (stem fibers).Treatments... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nutrient cycling; Nitrogen; Water quality. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000200009 |
| |
|
|
| Pereira,Natanael Santiago; Soares,Ismail; Miranda,Fábio Rodrigues de. |
| ABSTRACT: The use of leguminous green manure can be an alternative for the region agricultural systems due to its ability to incorporate significant amounts of nutrients into the soil through decomposition and nutrient release from biomass. This study aimed to evaluate the decomposition rates and nutrient release of six leguminous green manure species ( Crotalaria juncea , Canavalia ensiformes , Cajanus cajan , Crotalaria spectabilis , Dolichos lablab and Mucuna deeringiana ) in an area of the Jaguaribe-Apodi agricultural region, Brazil. Experiment was carried out under field conditions in a randomized block design with five replications. Decomposition and nutrient release from leguminous biomass were monitored by sampling at 30, 60, 90, 120, 150 and 180... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mineralization; Nutrient cycling; Plant residues. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000600970 |
| |
|
| |
|
|
| Staelens,Jeroen; Godoy,Roberto; Oyarzún,Carlos; Thibo,Karen; Verheyen,Kris. |
| Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in the Cordillera de los Andes, was similar to the litterfall return in a Nothofagus obliqua (Mirb.) Oerst. stand at Paillaco, in the Central Depression. In contrast, the net throughfall and stemflow deposition differed significantly between the two stands. At San Pablo de Tregua, the annual bulk deposition of NH4+ and NO3- was significantly higher than the throughfall and stemflow deposition reaching the forest floor. This demonstrates an uptake of inorganic... |
| Tipo: Journal article |
Palavras-chave: Ammonium; Atmospheric deposition; Canopy interactions; Nitrate; Nutrient cycling; Amonio; Ciclos de nutrientes; Depositación atmosférica; Interacciones del dosel; Nitrato. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002 |
| |
|
| |
|
|
| Torres,José LR; Ciabotti,Elaine D; Gomes,Fernando RC; Leal Junior,André LB; Vieira,Dinamar MS; Costa,Luciene L. |
| ABSTRACT Cauliflower and cabbage require high amounts of nutrients in short periods of time; however, the intensive use of inorganic fertilizers can cause nutritional imbalances in these crops and reduce the quality of the final product. This study evaluated the chemical composition and yield of no-till cauliflower and cabbage grown on residues of various cover crops in Uberaba, Minas Gerais State, Brazil. The experimental design was randomized blocks with four cover crops (sunn hemp, brachiaria, pearl millet and fallow) and two main crops (cauliflower and cabbage). The treatments were evaluated on plots of 20 m2 with four replications. The following traits were analyzed after harvest: moisture (MO), ash (ASH), lipid (LIP), crude fiber (CF), protein (PTN),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea var. botrytis; Brassica oleracea var. capitata; Crop residues; Nutrient cycling; Plant quality.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200252 |
| |
|
| |
|
|
| POMPEU, R. C. F. F.; SOUZA, H. A. de; FARIAS, J. L. de S.; BEZERRA, J. W. T.; FERNANDES, F. E. P.; PEREIRA, P. L.; ARAUJO, M. R. A. de; RIELLA, J.. |
| Objetivou-se avaliar a produção de biomassa, composição química e os atributos químicos do solo do consórcio milho-leguminosas forrageiras numa comunidade do município de Sobral, CE. Foram avaliados os consórcios milho-cunhã e milho-crotalária num delineamento de blocos completos casualizados, com quatro repetições. As parcelas experimentais foram constituídas de seis fileiras, com 5 m de comprimento, espaçadas entre si de um metro entre milho. O plantio do milho foi realizado no dia 01 de março de 2019, enquanto que o plantio das leguminosas foi realizado no dia 14 de março de 2019. Foram observadas diferenças de teores de matéria seca entre os consórcios cunhã-milho e crotalária-milho. Observou-se que a produção do consórcio crotalária-milho foi superior... |
| Tipo: Folhetos |
Palavras-chave: Feed crops; Nutrient cycling; Semiárido; Brasil; Região Nordeste; Leguminosa Forrageira; Cunha; Cobertura Morta; Volumosos; Alimento Para Animal; Forage production; Forage crops; Mulching; Biomass production; Intercropping; Brazil; Semiarid soils. |
| Ano: 2019 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1117068 |
| |
|
|
| PARRON, L. M.; BUSTAMANTE, M. M. da C.; PRADO, C. L. C.. |
| RESUMO: Em função do gradiente de umidade na topografia do terreno e de diferenças entre estações seca e chuvosa, o presente trabalho teve como objetivos quantificar a produção anual e a disponibilidade de nutrientes (N, P, K, Ca, Mg E S) na serapilheira e estimar a eficiência do uso de nutrientes em uma Mata de Galeria. O experimento foi estabelecido numa área de 100 x 100 m da Mata de Galeria do Córrego Pitoco, na Reserva Ecológica do IBGE, DF (15°56'41"S e 47°56'07"W). Como delineamento experimental, foram estabelecidas três linhas de amostragem paralelas ao córrego, distantes 45 m entre si, denominadas, respectivamente, comunidades úmida (na margem do córrego), intermediárias e seca (adjacentes a uma área de Cerrado Típico). A produção de serapilheira... |
| Tipo: Folhetos |
Palavras-chave: Biogeoquímica; Ciclagem de nutriente; Eficiência de nutriente; Savana; Productivity; Nutrient cycling; Litterfall; Nutrient efficiency; Disponibilidade de Nutriente; Floresta Tropical; Produtividade; Biogeochemistry; Savannas; Tropical forests. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569203 |
| |
|
| |
|
|
| Van Langenhove, Leandro; Verryckt, Lore T.; Bréchet, Laëtitia; Courtois, Elodie A.; Stahl, Clement; Hofhansl, Florian; Bauters, Marijn; Sardans, Jordi; Boeckx, Pascal; Fransen, Erik; Peñuelas, Josep; Janssens, Ivan A.. |
| Atmospheric deposition is an important component of the nutrient cycles of terrestrial ecosystems, but field measurements are especially scarce in tropical regions. In this study we analysed 15 months of precipitation chemistry collected in an old growth tropical forest located in French Guiana. We measured nutrient inputs via bulk precipitation and throughfall and used the canopy budget model to estimate nutrient fluxes via canopy exchange and dry deposition. Based on this method we quantified net fluxes of macronutrients and compared their contribution to internal cycling rates via litterfall. Our results suggest that while atmospheric deposition of nitrogen was relatively high (13 kg ha−1 year−1), and mainly in organic forms, the N inputs via litterfall... |
| Tipo: Text |
Palavras-chave: Throughfall; Litterfall; Nutrient cycling; Nitrogen; Phosphorus; Potassium. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74123/73572.pdf |
| |
| Registros recuperados: 55 | |
|
|
|
