A Revisit of Sandblasting Technique to Measure Soil Crust Strength

2021 ◽  
Author(s):  
Selen Deviren Saygın ◽  
Chi Hua Huang
Keyword(s):  
Soil Crust ◽  
Crust Strength

Soil crust strength measurement

1977 ◽  
Vol 8 (2) ◽  
pp. 139-148 ◽  
Author(s):  
E.R. Page ◽  
B.J. Hole
Keyword(s):  
Soil Crust ◽  
Strength Measurement ◽  
Crust Strength

EFFECT OF ORGANIC AMENDMENTS ON SOME PHYSICAL PROPERTIES OF LUVISOLIC SOILS IN RELATION TO EMERGENCE OF RAPESEED IN A GROWTH CHAMBER

1970 ◽  
Vol 50 (3) ◽  
pp. 397-402 ◽  
Author(s):  
W. F. NUTTALL
Keyword(s):  
Soil Moisture ◽  
Brassica Napus ◽  
Organic Amendments ◽  
Modulus Of Rupture ◽  
Growth Chamber ◽  
Soil Crust ◽  
Brassica Napus L ◽  
Plant Emergence ◽  
Soil Weight ◽  
Crust Strength

Organic amendments at 2.5% of soil weight were applied to three Luvisolic soils in the greenhouse. After five successive crops, soil crust strength as indicated by modulus of rupture measurements was reduced by the amendments. Modulus of rupture values were highly related (R2 = 85.4%) to plant counts of Target rape (Brassica napus L.) in the growth chamber. Modulus of rupture determinations were made independently on oven-dried samples and showed that the effect of soil moisture on crust strength among treatments was negligible. Plant emergence was increased as much as threefold by the amendments. Treatments increased field and available moisture capacities of soils but had little effect on moisture retained at 0.35 and 15.8 bar tensions.

Instrumentation for In-field Measurement of Soil Crust Strength

1995 ◽  
Vol 38 (1) ◽  
pp. 39-44 ◽  
Author(s):  
S. K. Upadhyaya ◽  
K. Sakai ◽  
J. L. Glancey
Keyword(s):  
Field Measurement ◽  
Soil Crust ◽  
Crust Strength

Assessment of the Role of Different Soil Properties on Crust Strength by Linear Regression Models

2019 ◽  
Vol 6 (04) ◽  
Author(s):  
MINAKSHI SERAWAT ◽  
V K PHOGAT ◽  
ANIL Abdul KAPOOR ◽  
VIJAY KANT SINGH ◽  
ASHA SERAWAT
Keyword(s):  
Hydraulic Conductivity ◽  
Soil Properties ◽  
Crop Yields ◽  
Modulus Of Rupture ◽  
Silty Clay ◽  
Linear Regression Models ◽  
Wide Range ◽  
Dispersion Ratio ◽  
Crust Strength

Soil crust strength influences seedling emergence, penetration and morphology of plant roots, and, consequently, crop yields. A study was carried out to assess the role of different soil properties on crust strength atHisar, Haryana, India. The soil samples from 0-5 and 5-15 cm depths were collected from 21 locations from farmer’s fields, having a wide range of texture.Soil propertieswere evaluated in the laboratory and theirinfluence on the modulus of rupture (MOR), which is the measure of crust strength, was evaluated.The MOR of texturally different soils was significantly correlated with saturated hydraulic conductivity at both the depths. Dispersion ratio was found to decrease with an increase in fineness of the texture of soil and the lowest value was recorded in silty clay loam soil,which decreased with depth. The modulus of rupture was significantly negatively correlative with the dispersion ratio.There was no role of calcium carbonate in influencing the values of MOR of soils. Similarly,the influence of pH, EC and SAR of soil solution on MOR was non-significant.A perusal of thevalues of the correlations between MOR and different soil properties showed that the MOR of soils of Haryana are positively correlated with silt + clay (r = 0.805) followed by water-stable aggregates (r = 0.774), organic carbon (r = 0.738), silt (r = 0.711), mean weight diameter (r = 0.608) and clay (r = 0.593) while negatively correlated with dispersion ratio (r = - 0.872), sand (r = -0.801) and hydraulic conductivity (r = -0.752) of soils.

scholarly journals Functional ecology of the biological soil crust in semiarid SE Spain: sun and shade populations of Diploschistes diacapsis (Ach.) Lumbsch.

2005 ◽  
Vol 37 (5) ◽  
pp. 425-432 ◽  
Author(s):  
Ana PINTADO ◽  
Leopoldo G. SANCHO ◽  
T. G. Allan GREEN ◽  
José Manuel BLANQUER ◽  
Roberto LÁZARO
Keyword(s):  
Water Content ◽  
Chlorophyll Content ◽  
Unit Area ◽  
Biological Soil Crust ◽  
Dry Weight ◽  
Mean Annual Precipitation ◽  
Plant Colonization ◽  
Soil Crust ◽  
Active Time ◽  
Exposed Population

The Tabernas badlands in semiarid south-east Spain is one of the driest regions in Europe with a mean annual precipitation of c. 240 mm. The landscape is deeply dissected, with canyons, ramblas and sparsely vegetated eroded badland slopes. The vegetation is predominantly a biological soil crust consisting of different types of lichen-rich communities, one of the more conspicuous being dominated by Diploschistes diacapsis (Ach.) Lumbsch. This lichen is mainly restricted to the north- facing slopes, where it forms extensive whitish carpets and probably plays an important role in preventing erosion of the slopes and allowing plant colonization. South-facing slopes are much more eroded and generally lack vegetation. %The photosynthetic performance of north (shade) and south-facing (sun) populations of D. diacapsis was studied to determine if these different populations showed any adaptations to the microclimatic conditions of their individual habitats. The response of CO2 exchange to light intensity, temperature and water content was measured under controlled conditions in the laboratory. Dry weight-based net photosynthetic rates were higher in the southern-exposed population but quantum efficiency, and light compensation points were similar. Thallus weight per unit area (LMA) was considerably higher for shade specimens but maximum water content and optimal water content were very similar and chlorophyll content on a dry weight basis was also similar. Chlorophyll content on an area basis was higher in the northern-exposed population and always much larger than those reported in other studies on the same species (up to 8 times larger) with the result that NP values on a chlorophyll basis were relatively low. The larger LMA meant that shade thalli stored more water per unit area which should ensure longer active periods than sun thalli. The results support a strategy pair of high NP and short active time versus low NP and long active time, both having been reported for other soil crust species. However, the visibly larger biomass of the shade D. diacapsis suggests that the lichen is at the limit of its adaptability in these habitats.

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