scholarly journals Effect of microbial activity, soil water content and added copper on the temporal distribution patterns of HCB and DDT among different soil organic matter fractions

2008 ◽  
Vol 152 (1) ◽  
pp. 245-252 ◽  
Author(s):  
Jing-jing Zhang ◽  
Bei Wen ◽  
Xiao-quan Shan
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Microbial Activity ◽  
Temporal Distribution ◽  
Distribution Patterns ◽  
Soil Organic Matter Fractions ◽  
Organic Matter Fractions

scholarly journals Short-term dynamics of soil organic matter fractions and microbial activity in smallholder potato-legume intercropping systems

2019 ◽  
Vol 142 ◽  
pp. 123-135 ◽  
Author(s):  
Shadrack O. Nyawade ◽  
Nancy N. Karanja ◽  
Charles K.K. Gachene ◽  
Harun I. Gitari ◽  
Elmar Schulte-Geldermann ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Microbial Activity ◽  
Short Term ◽  
Soil Organic Matter Fractions ◽  
Organic Matter Fractions

A numerical approach for understanding the main parameters and processes influencing the soil organic matter decay in wildfire events

2020 ◽  
Author(s):  
Sebastián A. Aedo ◽  
Carlos A. Bonilla
Keyword(s):  
Thermal Conductivity ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
High Temperatures ◽  
Pore Radius ◽  
Radiative Energy ◽  
Soil Response

<p>High temperatures reached at topsoil during wildfires can induce changes in physical, chemical, and biological soil properties. In the end, these changes are related to the loss of soil organic matter (SOM) and control the post-fire soil management decision. Therefore, the objectives of this study were: (1) to develop a numerical model to predict the SOM decay during wildfires, and (2) to study which are the main parameters that control the soil response. The model couples the energy balance for soil heating, and the species conservation for water and SOM using high temperature-induced vaporization and combustion kinetics. Fluid flow was neglected; however, radiative energy conducted through pores was included as a function of the volumetric pore radius. The soil thermal evolution showed values of r<sup>2</sup>>0.92 when the radiative term in the thermal conductivity was neglected, and r<sup>2</sup>>0.98 when the volumetric pore radius was adjusted. The results showed that the main parameters that control the soil response were soil texture, soil water content, volumetric pore radius, and oxygen availability. Also, soil response depends on the surface temperature and exposure time. Soil water content enhances the thermal properties and determines the amount of heat consumed during vaporization because of the high enthalpy of this endothermic reaction. On the other hand, neglecting oxygen flux leads to restricted oxidation, limiting the SOM decay. In terms of texture, silty soils showed the lower soil response, clay and loamy soils an intermediate response, and sandy soils had a higher response. Also, the volumetric pore radius enhances the soil thermal conductivity at high temperatures, leading to higher temperatures near the soil surface. These results suggest that the normalized SOM decay does not depend on the initial SOM content.</p>

Efficacy of downy brome herbicides as influenced by soil properties

1994 ◽  
Vol 74 (1) ◽  
pp. 177-183 ◽  
Author(s):  
R. E. Blackshaw ◽  
J. R. Moyer ◽  
G. C. Kozub
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Bromus Tectorum ◽  
Edaphic Factors ◽  
Downy Brome ◽  
Winter Cereals ◽  
Highly Correlated

Controlled environment experiments were conducted to determine the effect of various edaphic factors on the efficacy of metribuzin, BAY SMY 1500, cinmethylin, and napropamide to control downy brome (Bromus tectorum L.). Experiment 1 determined the effects of soil organic matter, pH and texture and experiment 2 determined the effect of soil water contents ranging from −0.03 to −1.5 MPa on herbicide efficacy on downy brome. Metribuzin, BAY SMY 1500, cinmethylin, and napropamide efficacy on downy brome was highly correlated with soil organic matter and soil water content. Phytotoxicity of these herbicides was decreased up to two- to threefold as organic matter increased and soil water content decreased. Metribuzin and BAY SMY 1500 efficacy on downy brome increased as soil pH increased. Cinmethylin was more efficacious in sandy soils. This information may aid in determination of precise herbicide rates for various soil types to allow growers to achieve consistent control of downy brome without injuring winter cereals. Key words: Edaphic factors, cinmethylin, BAY SMY 1500, metribuzin, napropamide, Bromus tectorum L.

Soil Organic Matter Fractions under Managed Pine Plantations of the Southeastern USA

2004 ◽  
Vol 68 (3) ◽  
pp. 950 ◽  
Author(s):  
Marietta E. Echeverría ◽  
Daniel Markewitz ◽  
Lawrence A. Morris ◽  
Ronald L. Hendrick
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Pine Plantations ◽  
Southeastern Usa ◽  
Soil Organic Matter Fractions ◽  
Organic Matter Fractions

scholarly journals Land use impacts on physical-based soil organic matter fractions on three hillside Ferrasols in Mexico

2011 ◽  
Vol 71 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Francisco Matus ◽  
Claudia Hidalgo ◽  
Carlos Monreal ◽  
Isabel Estrada ◽  
Mariela Fuentes ◽  
...  
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Land Use Impacts ◽  
Soil Organic Matter Fractions ◽  
Organic Matter Fractions

Decomposition temperature sensitivity of isolated soil organic matter fractions

2010 ◽  
Vol 42 (11) ◽  
pp. 1991-1996 ◽  
Author(s):  
Alain F. Plante ◽  
Richard T. Conant ◽  
Jenny Carlson ◽  
Rebecca Greenwood ◽  
Jeremy M. Shulman ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Temperature Sensitivity ◽  
Decomposition Temperature ◽  
Soil Organic Matter Fractions ◽  
Organic Matter Fractions
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