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| Carvalho,Arminda Moreira de; Bustamante,Mercedes Maria da Cunha; Kozovits,Alessandra Rodrigues; Miranda,Leo Nobre de; Vivaldi,Lúcio José; Sousa,Danielle Matias de. |
| O objetivo deste trabalho foi avaliar emissões de NO e N2O até cinco dias após a primeira fertilização de cobertura com uréia em milho, em Latossolo Vermelho argiloso distrófico, sob plantio convencional e direto. A adubação de cobertura foi de 60 kg ha-1 de N. O experimento foi conduzido na Embrapa Cerrados, Planaltina, DF, com delineamento de blocos ao acaso, com três repetições, sendo o terceiro cultivo de milho, em rotação com soja. Os fluxos de NO e N2O foram medidos em câmaras de PVC instaladas em cada parcela. Houve emissão alta de NO imediatamente após (5,4 ng N cm-2 h-1) e no terceiro dia (4,8 ng N cm-2 h-1) após aplicação de uréia e irrigação. Um dia após fertilização, a emissão de NO reduziu-se a 1,9 ng N cm-2 h-1, e cinco dias depois, alcançou... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Óxido nítrico; Óxido nitroso; Fertilização nitrogenada; Plantas de cobertura; Irrigação; Cerrado. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000400020 |
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| Valim,Eduardo André Ribeiro; Nalini Jr,Hermínio Arias; Kozovits,Alessandra Rodrigues. |
| Ecosystems on cangas (duricrust) present considerable heterogeneity of habitats due to microtopographic variations, soil accumulation and a variety of plant functional groups. Therefore, spatial and temporal ecosystem processes such as litterfall are to be expected to be large, and the absence of a level of productivity represents all the facets of iron-rich landscapes. We investigated litterfall in a iron-rich rock complex in the Iron Quadrangle of Brazil, with habitats formed on different evolutionary stages of the soil, resulting in a gradient of biomass, canopy cover and community structure. The measurements were made in open field areas, dominated by herb-shrub vegetation and interspersed with islands of dense vegetation in which there were individual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canga; Iron duricrust; Ferruginous fields; Litter production; Ecosystem productivity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200005 |
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| Figueiredo,Maurilio Assis; Diniz,Adriana Pedrosa; Abreu,Adriana Trópia de; Messias,Maria Cristina Teixeira Braga; Kozovits,Alessandra Rodrigues. |
| ABSTRACT Recovery of degraded areas of rupestrian grasslands is hampered mainly by the limited knowledge regarding substrate management and the biology of native species suitable for revegetation of these areas. The aim of our study was to examine the establishment and growth of Periandra mediterranea in different textures of lateritic substrate from a mining-degraded area. The growth of P. mediterranea was evaluated using fine and coarse laterite, both with and without the addition of topsoil. Survival, dry biomass, content of chemical elements and nodulation were evaluated in ten individuals per treatment sixteen months after planting. Although the substrate has low nutrient content, yet high metal concentrations, all plants survived. Plants growing on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bauxite; Canga; Leguminosae; Recovery of degraded areas; Rock outcrops; Topsoil. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200232 |
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| Messias,Maria Cristina Teixeira Braga; Leite,Mariangela Garcia Praça; Meira-Neto,João Augusto Alves; Kozovits,Alessandra Rodrigues. |
| Vascular species and their respective life-forms and coverage were recorded in a Brazilian quartzite and itabirite rocky outcrop site at Serra de Ouro Preto, producing the floristic, frequency and vegetational spectra. Three habitats in both lithologies were defined by geomorphology as: 1) Sloped areas near the mountain summit, with grasslands; 2) Plateaus in the middle of the slope, with grasslands; and 3) Lower and/or concave parts of the slopes, with woody savannas. The life-forms followed Raunkiaer's System. We aimed to answer the following questions: Do quartzite and itabirite rocky outcrops have different biological spectra? Are the biological spectra different in the geomorphologic habitats? Do the floristic, vegetational and frequency spectra... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological spectrum; Ferruginous rocky outcrops; Quadrilátero Ferrífero; Raunkiaer. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000200026 |
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| Figueiredo,Maurílio Assis; Baêta,Hudson Eustáquio; Kozovits,Alessandra Rodrigues. |
| Native grasses are potential species to be used in land rehabilitation. However, due to the lack of better knowledge of their performance, preference is given to exotic plants, which may be invasive and negatively affect the local biodiversity. In order to better understand the propagation of native species of the Quadrilátero Ferrífero (Minas Gerais, Brazil) using their seeds, and in so doing, indicate possible candidates for land rehabilitation, this study investigated the germination patterns of the following grasses: Andropogon bicornis L.; Andropogon leucostachyus Kunth; Setaria parviflora (Poir.) Kerguélen; Cenchrus brownii Roem. & Schult; Echinolaena inflexa (Poir.) Chase, and Apochloa euprepes (Renvoize) Zuloaga & Morrone. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Poaceae; Seed dormancy; Storage time; Heating; Potassium nitrate; Caryopsis. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000300013 |
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