Effect of soil structure on wheat germination in a red-brown earth

1955 ◽  
Vol 6 (6) ◽  
pp. 797 ◽  
Author(s):  
DS McIntyre
Keyword(s):  
Physical Properties ◽  
Soil Structure ◽  
Pore Space ◽  
Oxygen Deficiency ◽  
Heavy Rain ◽  
Physical Measurements ◽  
Wheat Germination ◽  
Permanent Rotation ◽  
Formed Part ◽  
Properties Of Soil

Physical properties of soil have been measured on two experimental plots which showed high compaction and poor germination of wheat under very wet conditions. The plot treatments were a two-course and a four-course rotation, and formed part of a permanent rotation trial at the Waite Institute. Similar physical properties were measured for thick crusts formed on these cultivated soils. Under the wet conditions pore space available for air was low in both plots, and within the crust itself was almost zero. Significant differences were found in bulk density and water-stable aggregation between treatments. Waterstable aggregation was very low under both treatments compared with that in virgin soil. All physical measurements point to an oxygen deficiency for a period of 2-3 weeks, and this could account for the poor germination and poor early growth, particularly in the two-course rotation plots. The bad structure conditions leading to this are probably due to pulverizing by implements and dispersion over the years by heavy rain, rather than to decrease in organic matter.

Micromorphology of soil structure - Description, quantification, application

Soil Research ◽  
1991 ◽  
Vol 29 (6) ◽  
pp. 777 ◽  
Author(s):  
AJ Ringrose-Voase
Keyword(s):  
Soil Structure ◽  
Pore Space ◽  
Structural Parameters ◽  
Thin Sections ◽  
Physical Measurements ◽  
Undisturbed Samples ◽  
Structure Description ◽  
Management Techniques ◽  
Pore Types ◽  
Soil Behaviour

Micromorphological observation can provide insights into soil structure and aid interpretation of soil behaviour. Undisturbed samples are taken in the field and impregnated. They are used to prepare thin sections or images of the macropore structure using fluorescent photography. Sections can also be obtained at macro, meso and submicroscopic scales. The various elements of soil structure observed micromorphologically can be classified into pore space, physical, distribution and orientation fabrics, and associated structures. Examples of the importance of features in each category are given. Image analysis, especially when computerized, provides a way of parameterizing micromorphological observations. To date it has been used primarily on images of macropore space at the meso and microscopic scales. Such images can be digitized and segmented to show pore space and solid. The pore space can be allocated to pore types. This aids the estimation of 3-D parameters from I-D and 2-D measurements made on the image using stereology. Various ways of using structural parameters to compare structures are discussed. Applications for micromorphological observations, especially when quantitative, include comparison of structures formed by different management techniques. Structural measurements can aid interpretation of soil behaviour as described by physical measurements. They also have a role in estimating the representative elementary volume, on which physical measurements should be made, and in calibrating field estimates of soil structure.

From the results of the stability of soil structure studies and the physical characteristics of the black meadow soil of the mountain meadow in the limited national park (gorkhi-terelj national park)

2018 ◽  
Vol 22 (03) ◽  
pp. 89-95
Author(s):  
Lkhamsuren B ◽  
Odgerel B ◽  
Purevsuren Sh
Keyword(s):  
Physical Properties ◽  
Vegetation Cover ◽  
National Park ◽  
Soil Structure ◽  
Soil Stabilization ◽  
Meadow Soil ◽  
Mountain Meadow ◽  
Stability And Stabilization ◽  
The Stability ◽  
Properties Of Soil

The study aims to investigate changes in the physical properties of soil depending on the utilization conditions of the Special Protected National Park compared to the area fenced for more than 10 years. The stability and stabilization of the stabilized mountain meadow soil stabilization and physical properties of soil in the Gorkhi-Terelj National Park (GTNP) resort and limited concentration of tourism. As a result of the study, the stability of the soil structure was 2.8 points in the area of vegetation cover 0-3 cm outside the fence, while the 2.6 layered soil layers above the soils of the vegetation cover. However, the area with vegetation cover within the fence is 4.2 points in soil 0-3 cm and 4 leaves in soil without vegetation cover.

scholarly journals Improvement of Rheological Properties of Soil Structure Based on Lignite Dispersion

2019 ◽  
Vol 8 (11) ◽  
pp. 3700-3704
Keyword(s):  
Physical Properties ◽  
Rheological Properties ◽  
Relative Position ◽  
Time Variation ◽  
Soil Structure ◽  
Constant Strain Rate ◽  
Rheological Parameters ◽  
Stress And Strain ◽  
Relaxation Processes ◽  
Properties Of Soil

This article examines the change in stress and strain media, in particular natural leonardite (brown coal), prepared for grinding and during grinding, due to the restructuring of the material, i.e. changes in the relative position and deformation of the elements of the structure, including at the level of macromolecules that are inert to the deformation and relaxation processes, provide important for the technology to use improved rheological properties of the soil structure based on dispersion of leonardite, information about the physical properties of the material and its structure. The time variation of the stress in an inert-viscous-elastic medium with a constant strain rate depending on the values of the rheological parameters, it is possible to occur by three laws: aperiodic (steady), critical and oscillatory damp

scholarly journals Influence of Digestate on Physical Properties of Soil in ZD Budišov

2019 ◽  
Vol 67 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Stanislav Jaša ◽  
Barbora Badalíková ◽  
Jan Červinka
Keyword(s):  
Soil Fertility ◽  
Physical Properties ◽  
Bulk Density ◽  
Soil Structure ◽  
Physical State ◽  
Crop Yields ◽  
Crop Establishment ◽  
Air Capacity ◽  
Properties Of Soil

One of the main objectives of crop establishment is adjustment of physical properties of soil, on which indicators of soil fertility as well as economic appreciation of the resulting yield depend. During 2014–2016 yield of corn and sorghum was observed in semi‑operational experiments of ZD Budišov in relation to the quantity of the applied digestate and simultaneously, the following physical properties of soil were analysed: porosity, compaction and soil structure. After the application of digestate the porosity and minimal air capacity decreased, and reduced bulk density increased. Soil structure was affected negatively too. Overall, a trend of degradation of physical state of soil in variant with doubled dose of applied digestate was registered. Yields were always higher in variants with digestate due to a higher supply of higher amount of nutrients. Results of this observation indicate that crop yields may be higher but at the same time physical properties of soil may be impaired which may, while increasing doses of digestate, lead to irreversible degradation of soil.

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