Seismic Refraction Survey of a Volcanic Ash Deposit in Northwestern Ellis County, Kansas

1990 ◽  
Vol 93 (1/2) ◽  
pp. 55 ◽  
Author(s):  
K. R. Neuhauser
Keyword(s):  
Volcanic Ash ◽  
Seismic Refraction ◽  
Ash Deposit ◽  
Seismic Refraction Survey

scholarly journals Temporally selective modification of the tomato rhizosphere and root microbiome by a dacitic tuff breccia (volcanic ash) containing minerals and trace elements.

2021 ◽  
Author(s):  
Elijah C. Mehlferber ◽  
Kent F. McCue ◽  
Jon E. Ferrel ◽  
Britt Koskella ◽  
Rajnish Khanna
Keyword(s):  
Microbial Communities ◽  
Volcanic Ash ◽  
Crop Productivity ◽  
Growth Stress ◽  
Microbial Composition ◽  
Nutrient Environment ◽  
Ash Deposit ◽  
Phosphorus And Potassium ◽  
Underlying Mechanisms ◽  
Functional Pathway

Abstract Food crops are grown with fertilizers containing nitrogen, phosphorus, and potassium (macronutrients), along with magnesium, calcium, boron, and zinc (micronutrients) at different ratios during their cultivation. Soil and plant associated microbes have been implicated to promote plant growth, stress tolerance, and productivity. However, the high degree of variability across agricultural environments makes it difficult to assess the possible influences of nutrient fertilizers on these microbial communities. Uncovering the underlying mechanisms could lead us to achieving consistently improved food quality and productivity with minimal environmental impacts. For this purpose, we tested a commercially available fertilizer (surface-mined 38-million-year-old volcanic ash deposit AZOMITE®), applied as a supplement to the normal fertilizer program to tomato plants grown in the greenhouse. We examined its impact on the composition of below-ground microbial communities, focusing on those members we identified as "core taxa" that were enriched in the rhizosphere and root endosphere compared to bulk soil, and appeared above their predicted neutral distribution levels in control and treated samples. This analysis revealed that Azomite had little effect on soil or rhizosphere microbial composition overall, but it had a significant, temporally selective influence on the rhizosphere and root associated core taxa. Changes in the composition of the core taxa were correlated to associated functional pathway enrichment of carbohydrate metabolism over shorter chain carbon metabolism, suggesting a conversion of available microbial nutrient source within the roots. This finding exemplifies how the nutrient environment can specifically alter the functional capacity of root-associated bacterial taxa, with potential to improve crop productivity.

Seismic Refraction Survey, Louvicourt Township, Quebec (32c/4)

1969 ◽  
Author(s):  
H A Macaulay
Keyword(s):  
Seismic Refraction ◽  
Seismic Refraction Survey

Mapping the Pre-Holocene Surface of an Infilled Valley in the East Kent Fens, UK, with a Shear-Wave Seismic Refraction Survey

The Holocene ◽  
1992 ◽  
Vol 2 (1) ◽  
pp. 57-62 ◽  
Author(s):  
A. J. Long ◽  
C. A. Gunn ◽  
N. R. Goulty ◽  
D. J. Bedlington
Keyword(s):  
Shear Wave ◽  
Seismic Refraction ◽  
Seismic Refraction Survey

scholarly journals Subsurface Characterization using Geophysical Seismic Refraction Survey for Slope Stabilization Design with Soil Nailing

2018 ◽  
Vol 995 ◽  
pp. 012107
Author(s):  
Mohd Ashraf Mohamad Ismail ◽  
Soon Min Ng ◽  
Mohd Hazreek Zainal Abidin ◽  
Aziman Madun
Keyword(s):  
Seismic Refraction ◽  
Soil Nailing ◽  
Slope Stabilization ◽  
Subsurface Characterization ◽  
Seismic Refraction Survey

Sedimentary rock mass rippability assessment using seismic refraction survey

2019 ◽  
Author(s):  
M. Aziman ◽  
M. D. M. Firdaus ◽  
P. Faizal ◽  
A. T. S. Azhar ◽  
M. Nordiana ◽  
...  
Keyword(s):  
Rock Mass ◽  
Sedimentary Rock ◽  
Seismic Refraction ◽  
Seismic Refraction Survey
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