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Registros recuperados: 7
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Aggregate size effects on extractable phosphorus on acid upland soils International Rice Research Institute
Widowati, Ladiyani Retno.
xv, 83 p. : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Acid soils; Upland soils; Soil aggregates; Phosphorus; Zea mays; Plant growth.
Ano: 2001 URL: http://hdl.handle.net/123456789/460
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ARBUSCULAR MYCORRHIZAL FUNGI AND SOIL AGGREGATION R.C. Suelo Nutr. Veg.
Borie,Fernando; Rubio,Rosa; Morales,Alfredo.
Soil aggregation is governed by several biotic and abiotic components including land-use management. Aggregation is essential to maintain soil physical properties and facilitate biogeochemical cycling. Hyphae of arbuscular mycorrhizal fungi (AMF) are considered to be primary soil aggregators and there is a positively correlation between AMF hyphae and aggregate stability in natural systems. Recent evidence suggests that glomalin (GRSP), a glycoprotein produced by AMF hyphae which has a cementing capacity to maintain soil particles together, is mainly involved in such aggregation. However, recently controversial results together with reported shortcoming in glomalin determinat suggest to proceed with caution when studying glomalin in connection with soil...
Tipo: Journal article Palavras-chave: Arbuscular mycorrhizal fungi; Soil aggregates; Glomalin.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000200003
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Bacterial exopolysaccharide and biofilm formation stimulate chickpea growth and soil aggregation under salt stress BJM
Qurashi,Aisha Waheed; Sabri,Anjum Nasim.
To compensate for stress imposed by salinity, biofilm formation and exopolysaccharide production are significant strategies of salt tolerant bacteria to assist metabolism. We hypothesized that two previously isolated salt-tolerant strains Halomonas variabilis (HT1) and Planococcus rifietoensis (RT4) have an ability to improve plant growth, These strains can form biofilm and accumulate exopolysacharides at increasing salt stress. These results showed that bacteria might be involved in developing microbial communities under salt stress and helpful in colonizing of bacterial strains to plant roots and soil particles. Eventually, it can add to the plant growth and soil structure. We investigated the comparative effect of exopolysacharide and biofilm formation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofilm; Cicer arietinum; Exopolysaccharide; Salinity; Soil aggregates.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000300046
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Effect of cropping systems in no-till farming on the quality of a Brazilian Oxisol Rev. Bras. Ciênc. Solo
Seben Junior,Getulio de Freitas; Corá,José Eduardo; Lal,Rattan.
The no-till system with complex cropping sequences may improve the structural quality and carbon (C) sequestration in soils of the tropics. Thus, the objective of this study was to evaluate the effects of cropping sequences after eight years under the no-till system on the physical properties and C sequestration in an Oxisol in the municipality of Jaboticabal, Sao Paulo, Brazil. A randomized split-block design with three replications was used. The treatments were combinations of three summer cropping sequences - corn/corn (Zea mays L.) (CC), soybean/soybean (Glycine max L. Merryll) (SS), and soybean-corn (SC); and seven winter crops - corn, sunflower (Helianthus annuus L.), oilseed radish (Raphanus sativus L.), pearl millet (Pennisetum americanum (L.)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Crop rotation; Winter crops; Soil aggregates; Least limiting water range; Bulk density.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400023
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Soil aggregation according to the dynamics of carbon and nitrogen in soil under different cropping systems PAB
Seben Junior,Getulio de Freitas; Corá,José Eduardo; Lal,Rattan.
Abstract The objective of this work was to evaluate total soil carbon and nitrogen, as well as their contents in particulate and mineral-associated C fractions; to determine C stock and sequestration rates in the soil; and to verify the effect of C and N contents on soil aggregation, using different crop rotations and crop sequences under no-tillage. The study was carried out for nine years in a clayey Oxisol. The treatments consisted of different cropping systems formed by the combination of three summer crops (cropped until March) - corn (Zea mays) monocropping, soybean (Glycine max) monocropping, and soybean/corn rotation - and seven second crops (crop successions). Soil samples were taken at the 0.00-0.10-m layer for physical fractionation of C and N,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbon sequestration; Carbon stocks; Cover crops; Crop rotation; Soil aggregates; Soil organic matter.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901652
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Soil moisture retention and mass movement of volcanic soils from the "Sabinas" sector in Caldas, Colombia Acta Agron. (Palmira)
Chavarriaga Montoya,William; Cruz Cerón,Gabriel; Cuervo Correa,Johan.
Abstract The mass movement of soils, are soil, rocks displacements or both, caused by soil water excesses in terrains due to gravity effects and other factors. The aim of this research was to quantify the moisture retention capacity of volcanic soils as a threat indicator in the mass removal phenomena. This research was carried out on soils of the Malteria - Las Margaritas road transept to Magdalena river, right bank of the Chinchiná river in the Department of Caldas, Colombia. Through soil sample design, 3 altitudinal ranges were stratified as follows: high, medium and low. In fact, representative plant cover was taken in the study area, sampling the combination of the following variables: "plant cover" and "altitudinal range". In total, 52 points were...
Tipo: Journal article Palavras-chave: Hydraulic conductivity; Humidity threat; Soil aggregates; Soil mass removal; Stability.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400588
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Spatial analysis of soil physical attributes from a degraded area under different types of management. Repositório Alice
CARVALHO, J. C. B. de; ESPINDOLA, C. R.; ALVES, M. C.; GREGO, C. R.; VIEIRA, S. R..
The objective of this work was to analyze the spatial variability of soil aggregates, porosity and density under five different land-uses and management conditions (degraded substrate - SD; degraded substrate with sewage sludge and Eucalyptus crop - SDLE; soil under pasture SP; capoeira under regeneration - SR; and soil under cerrado - SC). Total porosity (m3.m-3) and density (Mg m-3) of the soil; the mean weight diameter (MWD, mm) of the aggregates; and the percentage of aggregates resistant to rainfall were evaluated. The date of soil was analyzed with descriptive statistics for initial exploration and geostatistics, to analyze the spatial variability. There was spatial dependency and the parameter adjust range varied from 8 to 12 m under the treatments...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Geoestatística; Análise espacial; Spatial variability; Geostatistics; Soil aggregates.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1086890
Registros recuperados: 7
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