Results 261 to 270 of about 256,061 (311)

Soil aggregation and soil aggregate stability regulate organic carbon and nitrogen storage in a red soil of southern China

Journal of Environmental Management, 2020
Soil aggregation plays a critical role in the maintenance of soil structure, as well as in its productivity. Fertilization influences soil aggregation, especially by regulating soil organic carbon (SOC) and total nitrogen (TN) contents in aggregate fractions.
Adnan, Mustafa, Xu, Minggang, Syed Atizaz, Ali Shah, Muhammad Mohsin, Abrar, Sun, Nan, Wang, Baoren, Cai, Zejiang, Qudsia, Saeed, Muhammad, Naveed, Khalid, Mehmood, Avelino, Núñez-Delgado   +10 more
openaire   +2 more sources

Aggregation and Aggregate Stability in Forest and Range Soils

Soil Science Society of America Journal, 1988
Abstract A simple method for measuring aggregation and aggregate stability across soils of widely varying structure and texture is presented. The method uses standard techniques of particle‐size analysis to measure yield of fine particles (<26‐µm estimated spherical diam.) after three types of dispersion treatments: shaking in ...
T. C. Strickland, E. A. Kerle, P. Sollins, D. S. Schimel   +3 more
openaire   +1 more source

Effect of soil aggregation on the biodegradation of phenanthrene aged in soil

Environmental Pollution, 2003
A study was conducted to determine the possible role of soil aggregates in the sequestration of phenanthrene and thus in the declined biodegradation of the hydrocarbon. Phenanthrene aged in Lima loam (2-mm aggregates) showed declined biodegradation with time of aging to the test bacterium P5-2 capable of using sorbed phenanthrene.
K, Nam, J Y, Kim, D I, Oh
openaire   +2 more sources

Chromium Diffusion and Reduction in Soil Aggregates

Environmental Science & Technology, 2001
The distribution of metal contaminants such as chromium in soils can be strongly localized by transport limitations and redox gradients within soil aggregates. Measurements of Cr(VI) diffusion and reduction to Cr(III) were obtained in soil columns representing transects into soil aggregates in order to quantify influences of organic carbon (OC) and ...
T K, Tokunaga, J, Wan, M K, Firestone, T C, Hazen, E, Schwartz, S R, Sutton, M, Newville   +6 more
openaire   +2 more sources

Dynamics of Soil Aggregation

1966
Publisher Summary This chapter discusses the factors and mechanisms governing the formation and destruction of water-stable soil aggregates. The formation and degradation of water-stable aggregates comprise a complex interrelationship of physical, biological, and chemical reactions.
R.F. Harris, G. Chesters, O.N. Allen
openaire   +1 more source

Soil aggregation in the seedbed: A review. I. Properties of aggregates and beds of aggregates

Soil and Tillage Research, 1989
Tillage improves soil conditions for plant growth by altering the aggregate size distribution which affects the mechanical, physical and agronomic properties of the soil. Properties of individual aggregates and how these relate to seedbed performance are reviewed.
M.V. Braunack, A.R. Dexter
openaire   +1 more source

Soil Aggregation in Relation to Various Soil Constituents

Soil Science Society of America Journal, 1957
Abstract The relative importance of diverse factors affecting aggregation in four Wisconsin soil types was studied by multiple regression analyses. Single and combined effects of pH and contents of organic matter, microbial gum, clay, and free iron oxide were considered.
G. Chesters, O. J. Attoe, O. N. Allen
openaire   +1 more source

Variation of soil aggregation and intra-aggregate carbon by long-term fertilization with aggregate formation in a grey desert soil

CATENA, 2017
Abstract A long-term field experiment was established in 1990 to evaluate the impact of mineral fertilizer (N and NPK) and organic material (manure and crop residues) application on soil aggregation and organic carbon (C) accumulation in an intensively cultivated grey desert soil in northwestern China. The long-term addition of organic materials with
Maibo Jiang, Xihe Wang, Yunhao Liusui, Chao Han, Chengyi Zhao, Hua Liu   +5 more
openaire   +1 more source

BRITTLE FRACTURE OF SOIL AGGREGATES AND THE COMPACTION OF AGGREGATE BEDS

Journal of Soil Science, 1979
Summary A statistical theory is developed for the brittle fracture of soil aggregates. Fracture is assumed to depend on the flaws, such as cracks and holes, within the aggregates, the weakest flaw limiting strength. An equation known as the third asymptote distribution of smallest values gives the distribution of these weakest flaws.
M. V. BRAUNACK, J. S. HEWITT, A. R. DEXTER   +2 more
openaire   +1 more source

The Role of Soil Aggregates in Soil Erosion Processes

1998
Aggregate size and stability represent two soil characteristics that may rapidly change in response to changes in climatic conditions and land-use. Their roles in soil erosion processes have always been recognised but their sizes and stability have rarely been used in formula or algorithms Several erosion processes are discussed here and possible roles
Dino Torri, Rossano Ciampalini, Pietro Accolti Gil   +2 more
openaire   +1 more source