MOISTURE TENSION, DIFFUSIVITY, AND CONDUCTIVITY OF A LOAM SOIL DURING WETTING AND DRYING

1965 ◽  
Vol 45 (1) ◽  
pp. 78-86 ◽  
Author(s):  
W. J. Staple
Keyword(s):  
Particle Size ◽  
Soil Moisture ◽  
Particle Size Distribution ◽  
Bulk Density ◽  
Size Distribution ◽  
Packed Columns ◽  
Silt Loam ◽  
Surface Soils ◽  
Wetting And Drying ◽  
Loam Soil

Soil moisture tensions, diffusivities, and conductivities in packed columns of Grenville silt loam during wetting were compared with those during drying. In the moisture range 0.3 to 0.4 cm3/cm3 tensions on wetting were only one third of those on drying. Diffusivities and conductivities on wetting exceeded those on drying in the ratios 5:1 and 10:1 respectively. These data depended on the bulk density and particle size distribution of the soil. The observed wetting to drying ratios of D and K should be representative for fragmented surface soils although lower ratios may occur below plow depth.

Modeling the Production Technology of Fully-Pressed Bi-Metal Powder Materials and Products

2021 ◽  
Vol 316 ◽  
pp. 570-575
Author(s):  
Badrudin G. Gasanov ◽  
Abakar B. Gasanov ◽  
Artem A. Aganov
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Bulk Density ◽  
Size Distribution ◽  
Metal Powder ◽  
Production Technology ◽  
Powder Mixture ◽  
Geometric Parameters ◽  
Powder Materials ◽  
Loading Devices

The features of calculating the thickness of the layers of bimetallic powder products without holes and the type of bushings are shown. The effect of the particle size distribution of the powders, the kinematic and geometric parameters of the loading devices and molds on the mechanism of the expiration of the powder mixture and on the thickness of the layers of the molded product is studied. A technique has been developed for determining the dimensions of the feeder cassette and tooling, depending on the overall dimensions and thicknesses of the working layers, in the production of whole-pressed bimetallic products on press machines with a vertical arrangement of layers. It was found that the thickness of each layer of bimetallic products depends on the geometric parameters of the feeder cassette and tooling, bulk density, particle size distribution and other characteristics of the powders, as well as on the speed of lowering the lower punch ν1 .

Fly ash influence on near-surface temperature of a clay loam soil

1998 ◽  
Vol 78 (2) ◽  
pp. 345-350 ◽  
Author(s):  
A. M Hammermeister ◽  
D. S. Chanasyk ◽  
M. A. Naeth
Keyword(s):  
Particle Size ◽  
Heat Capacity ◽  
Fly Ash ◽  
Particle Size Distribution ◽  
Soil Temperature ◽  
Water Content ◽  
Bulk Density ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Loam Soil

It has been suggested that fly ash, when applied as a soil amendment, would increase soil temperature. However, no quantitative data have been provided to support this hypothesis. This hypothesis was tested on four fly ash treatments (0, 100, 200, and 400 t ha−1) applied to clay loam soil in a randomized block design. Bi-hourly soil temperatures were measured on 3 summer days over 2 yr, and afternoon temperatures were measured on randomly selected spring days at 5-, 10-, and 20-cm depths in the four fly ash treatments. Temperatures were measured in conjunction with surface bulk density, water content, and particle size distribution which were also used to calculate thermal heat capacity. Fly ash decreased percent clay, soil water content, and soil heat capacity. Contrary to previously expected trends, fly ash amendment did not significantly increase mean daily soil temperature under dry conditions. Generalizations in the literature regarding the influence of fly ash on soil temperature, bulk density, and water-holding capacity must be considered carefully since they generally relate only to coarse to medium textured soils. Key words: Soil amendments, bulk density, reclamation, heat capacity, thermal diffusivity, thermal conductivity, volumetric water content, particle size distribution

ESTIMATION OF WATER-RETENTION CHARACTERISTICS FROM THE BULK DENSITY AND PARTICLE-SIZE DISTRIBUTION OF SWEDISH SOILS

Soil Science ◽  
1996 ◽  
Vol 161 (12) ◽  
pp. 832-845 ◽  
Author(s):  
Kálmán Rajkai ◽  
Sándor Kabos ◽  
M. Th. Van Genuchten ◽  
Per-Erik Jansson
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Bulk Density ◽  
Size Distribution ◽  
Water Retention ◽  
Retention Characteristics

scholarly journals Timing Study to Evaluate Product Performance of RH-0345 and Imidacloprid to Suppress Green June Beetle Grubs on a Golf Course Fairway in Lancaster County, Pennsylvania, 1996

1998 ◽  
Vol 23 (1) ◽  
pp. 353-354
Author(s):  
P. R. Heller ◽  
R. Walker
Keyword(s):  
Particle Size ◽  
Soil Moisture ◽  
Soil Temperature ◽  
Soil Type ◽  
Clay Soil ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Silt Loam ◽  
Water Ph ◽  
Loam Soil

Abstract The fairway located in Lancaster County, PA, consisted primarily of perennial ryegrass (80%) and creeping bentgrass (50%). Treatment plots were 7 X 6 ft, arranged in a RCB design and replicated 3 times. Liquid formulations were applied by using a CO2 sprayer with 4 8004VS TeeJet nozzles mounted on a 6-ft boom, operating at 28 psi, and delivering 4 gal/1000 ft2. At the 1st treatment time (4 Jun), the following soil and environmental conditions existed: air temperature, 68° F; soil temperature at 1-inch depth, 64° F; soil temperature at 2-inch depth, 62° F; RH, 67%; amount of thatch, 0.125 inch; soil type, silt loam; soil particle size analysis: 30.7% sand, 61.9% silt, 7.4% clay; soil moisture (oven baked), 28.3%; organic matter, 5.6%; water pH, 7.0; soil pH, 6.1; time of treatment, mid-morning; and overcast skies. The experimental area was irrigated with 0.25 inch of water 3 fir after treatment. At the 2nd treatment time (15 Jul), the following soil and environmental conditions existed: air temperature, 78° F; soil temperature at 1-inch depth, 74° F; soil temperature at 2-inch depth, 75° F; RH, 75%; amount of thatch, 0.0625-0.125 inch; soil type; silt loam; soil particle size analysis: 30.7% sand, 61.9% silt, 7.4% clay; soil moisture (oven baked), 37.7%; organic matter, 7.2%; water pH, 7.0; soil pH, 5.9; time of treatment, mid-morning; and cloudy skies. The experimental area was irrigated with 0.25 inch of water immediately after product dried. A the 3rd treatment time (12 Aug), the following soil and environmental conditions existed: air temperature, 65° F; soil temperature at 1-inch depth, 69° F; soil temperature at 2-inch depth, 69° F; RH, 90%; amount of thatch, 0.0625-0.125 inch; soil type, silt loam; soil particle size analysis: 30.7% sand, 61.9% silt, 7.4% clay; soil moisture (oven baked), 40.0%; organic matter, 5.7%; water pH, 7.0; soil pH, 6.5; time of treatment, early morning; and cloudy skies. The experimental area was irrigated with 0.25 inch of water immediately after product dried. Post-treatment counts were made on 29 Aug. The total number of green of June beetle larvae flushed to the surface following an application of Sevin SL over a 24-hr observation interval was recorded from each replicate.

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