Results 21 to 30 of about 993 (117)

Spatiotemporal Distribution of Cattle Dung Patches in a Subtropical Soybean-Beef System under Different Grazing Intensities in Winter

Agronomy, 2020
Cattle dung distribution in pastoral ecosystems is uneven and affects nutrient availability to plants. Thus, identifying its spatiotemporal patterns is crucial to understanding the mechanisms underlying the system functioning.
Francine D. da Silva, Pedro A. de A. Nunes, Christian Bredemeier, Monica Cadenazzi, Lúcio P. Amaral, Fernando M. Pfeifer, Ibanor Anghinoni, Paulo C. de F. Carvalho   +7 more
doaj   +1 more source

Desempenho de forrageiras hibernais sob distintos níveis de luminosidade Performance of hibernal forages under distinct brightness levels

Revista Brasileira de Zootecnia, 2010
Objetivou-se determinar os possíveis efeitos da restrição de luminosidade, obtida com distintas densidades de árvores de Pinnus taeda, sobre a produção e qualidade de: aveia-preta (Avena strigosa Schreb) cv. Comum, aveia-branca (Avena sativa L.) cv. Fapa
Roque Kirchner, André Brugnara Soares, Laércio Ricardo Sartor, Paulo Fernando Adami, Francisco Migliorini, Lidiane Fonseca   +5 more
doaj   +1 more source

Discrete Pulses of Cooler Deep Water Can Decelerate Coral Bleaching During Thermal Stress: Implications for Artificial Upwelling During Heat Stress Events

Frontiers in Marine Science, 2020
Global warming is considered to be the most severe threat to coral reefs globally, which makes it important for scientists to develop novel strategies that mitigate the impact of warming on corals and associated habitats.
Yvonne Sawall, Moronke Harris, Mario Lebrato, Marlene Wall, Ellias Yuming Feng   +4 more
doaj   +1 more source

Soil fertility and agriculture yield with the application of organomineral or mineral fertilizers in solid and fluid forms [PDF]

Pesquisa Agropecuária Brasileira, 2018
: The objective of this work was to evaluate the effects of organomineral and mineral fertilizers, in their solid and fluid forms, on soils with variable charges with high fertility built up from nitrogen, phosphorus, and potassium contents in the soil ...
Juliano Corulli Corrêa, Agostinho Rebellatto, Marco André Grohskopf, Paulo Cezar Cassol, Paulo Hentz, Amanda Zolet Rigo   +5 more
doaj   +1 more source

Carbon in aggregate size classes in a Rhodic Eutrudox under different cropping systems

Semina: Ciências Agrárias, 2019
Soil productive capacity is related to levels of carbon (C) in aggregates of different sizes. The aim of this study was to assess total organic carbon levels in different size classes of water-stable aggregates in a Rhodic Eutrudox under different ...
Wesley Machado, Thadeu Rodrigues de Melo, Alex Figueiredo, José Victor de Freitas dos Santos, Felipe Gasparello Luccas, Júlio Cézar Franchini, Maria de Fátima Guimarães, João Tavares Filho   +7 more
doaj   +1 more source

Seleção de plantas com potencial para fitorremediação de solos contaminados com o herbicida trifloxysulfuron sodium Plant selection with potential for phytoremediation of soils contaminated with trifloxysulfuron sodium

Planta Daninha, 2004
Este trabalho teve como objetivo identificar plantas tolerantes ao trifloxysulfuron sodium, visando utilizá-las em programas de fitorremediação. Foram avaliadas dez espécies: Medicago sativa, Avena strigosa, Crotalaria juncea, Canavalia ensiformis ...
S.O. Procópio, J.B. Santos, A.A. Silva, F.R. Pires, J.I. Ribeiro Júnior, E.A. Santos, L.R. Ferreira   +6 more
doaj   +1 more source

Oxygen consumption from air and water, ammonia and urea‐N excretion, and Na+ fluxes during progressive aquatic hypoxia in Amazonian armoured catfish Pterygoplichthys gibbiceps and Pterygoplichthys pardalis

Journal of Fish Biology, EarlyView.
Abstract The Amazonian loricariid fish Pterygoplichthys gibbiceps, from the Rio Negro, and Pterygoplichthys pardalis, from the Rio Solimões, are facultative air‐breathers that can use the stomach as an air‐breathing organ. Measurement of oxygen uptake under progressive aquatic hypoxia revealed a relatively high hypoxia resistance of both species.
Bernd Pelster, Chris M. Wood, Adalberto Luis Val   +2 more
wiley   +1 more source

Bacterial acquisition in juveniles of several broadcast spawning coral species. [PDF]

PLoS ONE, 2010
Coral animals harbor diverse microorganisms in their tissues, including archaea, bacteria, viruses, and zooxanthellae. The extent to which coral-bacterial associations are specific and the mechanisms for their maintenance across generations in the ...
Koty H Sharp, Kim B Ritchie, Peter J Schupp, Raphael Ritson-Williams, Valerie J Paul   +4 more
doaj   +1 more source

Nitrogen excretion and oxygen consumption under severe hypoxia in siluriform fishes from the Amazon

Journal of Fish Biology, EarlyView.
Abstract Siluriform fishes collected from the Rio Negro and Rio Solimões proved to be highly resistant to aquatic hypoxia. In all four species analysed in this study, aquatic oxygen consumption significantly decreased from normoxic levels at water PO2 values near 1 kPa. Air‐breathing activity was observed only in Sturisoma sp. (Rio Negro).
Bernd Pelster, Chris M. Wood, Adalberto Luis Val   +2 more
wiley   +1 more source

Produtividade de soja e milho após coberturas de inverno e descompactação mecânica do solo Soybean and corn yield after soil winter covers and soil mechanical loosening

Pesquisa Agropecuária Brasileira, 2010
O objetivo deste trabalho foi avaliar o efeito de coberturas de inverno e da descompactação mecânica do solo sobre o desempenho de soja e milho, em sistema de plantio direto.
Henrique Debiasi, Renato Levien, Carlos Ricardo Trein, Osmar Conte, Karina Marie Kamimura   +4 more
doaj   +1 more source