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| Registros recuperados: 30 | |
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| OLIVEIRA, J. R. A. de; VILELA, L.; AYARZA, M. A.. |
| Os objetivos deste trabalho foram verificar a absorça de nitrato e identificar as propriedades dos solos que mais influenciam este fenomeno, em um latossolo, vermelho- escuro, com 56% de argila, em Planaltina, DF. Em 1996 foram coletadas amostras de solo nas profundidades de 0-20, 20-40, 40-80, 80-100 cm, de um experimento com cinco anos de duraçao, em uma area de cerrado tipico em duas areas cultivadas com soja e milho, onde o solo apresentava inversao de carga em profundidade. Tambem foram coletadas amostras em um solo sob cerradao, com carga eletrica liquida nagativa em profundidade. A relaçao entre nitrato absorviso e nitrato na soluçao foi descrita pela equacao de Freundlich e as relacoes entre o nitrato absorvido e algumas propriedades... |
| Tipo: Artigo de periódico |
Palavras-chave: Propriedade fisico quimica; Sulphate; Soil eletric charge.; Composto Inorgânico; Cerrado; Gesso; Matéria Orgânica; Solo; Sulfato.; Gypsum; Inorganic compounds; Organic matter.. |
| Ano: 2000 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/567877 |
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| Meriño-Gergichevich,C; Alberdi,M; Ivanov,A.G; Reyes-Diaz,M. |
| High aluminum (Al) concentrations as Al3+ represent an important growth and yield limiting factor for crops in acid soils (pH ≤5.5). The most recognized effect of Al-toxicity in plants is observed in roots. However, damages in the upper parts (including stem, leaves and fruits) may also be present. In addition, Al-toxicity triggers an increase in reactive oxygen species (ROS), causing oxidative stress that can damage the roots and chloroplasts, decreasing normal functioning of photo synthetic parameters. Al-toxicity may also increase or inhibit antioxidant activities, which are responsible to scavenge ROS. As result of the negative effects of toxic Al, root metabolic processes, such as water and nutrient absorption, are disturbed with a... |
| Tipo: Journal article |
Palavras-chave: Acid soils; Aluminum; Amendments; Calcium; Gypsum. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100003 |
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| COGO, F. D.; SAGGIN JUNIOR, O. J.; GUIMARÃES. P. T. G.; SIQUEIRA, J. O.; CARNEIRO, M. A. C. |
| High rates of agricultural gypsum, above the recommended levels, have been used on a regular basis to deepen plant roots and to alleviate recurrent water stress in Cerrado areas. However, very little is known about the consequences of this practice to arbuscular mycorrhizal fungi (AMF). Therefore, the objective of this study was to evaluate whether or not applying high rates of agricultural gypsum affects the mycorrhizal fungi community, glomalin content and coffee yield. The study rates were: 0; 3.5; 7.0; 14 and 56 t·ha-1 of agricultural gypsum applied in the planting row of the coffee plantation on top of the previous recommended gypsum application. Samples were collected for analysis at the depths of 0-20, 20-40 and 40-60 cm at the end of dry and rainy... |
| Tipo: Artigo de periódico |
Palavras-chave: Coffea Arábica; Cerrado; Glomalin; Gypsum. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1126810 |
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| Blanchet, C. L.; Kasten, S.; Vidal, L.; Poulton, S. W.; Ganeshram, R.; Thouveny, N.. |
| In order to evaluate the influence of diagenetic and post-sampling processes on the stable oxygen and carbon isotope compositions of biogenic carbonates, we conducted a multiproxy study of organic-rich sediments from the eastern Pacific oxygen minimum zone. Core MD02-2520, which was retrieved from the Gulf of Tehuantepec (Mexico), has seasonal laminations and covers the last 40 kyr. Together with the presence of gypsum crystals and inorganic calcite aggregates, the occurrence of large excursions in the stable oxygen and carbon isotope records of both planktonic and benthic foraminifera (as large as +3 parts per thousand in delta O-18 and -5 parts per thousand in delta C-13) point to significant secondary transformations. Storage-related gypsum... |
| Tipo: Text |
Palavras-chave: Diagenesis; Gypsum; Inorganic calcite; Laminations; Oxygen minimum zone; Sulfur reoxidation. |
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00139/25049/23173.pdf |
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| Andrade,Alex Teixeira; Fernandes,Luiz Arnaldo; Faquin,Valdemar. |
| Organic residue application is a low cost alternative to reduce the use of inorganic fertilizers and correctives. In order to study the effect of organic residues, limestone and gypsum application on phosphorus adsorption by lowland soils, four experiments were carried out. A Mesic Organosol (OY), a Melanic Gleysol (MG), a Haplic Gleysol (GX), and a Fluvic Neosol (RU) were used in a completely randomized design and factorial scheme (3 x 2), with five replicates: three soil amendment practices (limestone, gypsum and no corrective) and two levels of organic residue (with and without corral manure). Soil samples were incubated for 60 days, with and without organic residue incorporation. After this period, we applied the corrective and incubated the soil for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Liming; Gypsum; Organic matter. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200022 |
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| Lastiri-Hernández,Marcos Alfonso; Alvarez-Bernal,Dioselina; Bermúdez-Torres,Kalina; Cárdenas,Gustavo Cruz; Ceja-Torres,Luis Fernando. |
| ABSTRACT The shortage of water and the increasing salinity are the main limiting environmental factors that directly affect the establishment and the development of crops. In this research, phytodesalination capacity of Sesuvium verrucosum was evaluated alone and in combination with agricultural gypsum (CaSO4·2H2O) and Polisul-C, in order to remedy a moderately saline soil at greenhouse level and under nonleaching conditions. The treatments studied were the following: T1 (soil), T2 (soil + S. verrucosum), T3 (soil +S. verrucosum + Polisul-C), T4 (soil + S. verrucosum + CaSO4·2H2O). Polyvinyl chloride (PVC) tubes filled with 8 kg of clay soil with an electrical conductivity of the saturation paste extract (ECe) of6.21 dS.m-1 were used. Soil samples were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gypsum; Halophyte; Nonleaching; Polisul-C; Salinity; Sesuvium verrucous. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000400579 |
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| Registros recuperados: 30 | |
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