scholarly journals Transfer Factors of Radioiodine from Volcanic-ash Soil (Andosol) to Crops

2003 ◽  
Vol 44 (1) ◽  
pp. 23-30 ◽  
Author(s):  
TADAAKI BAN-NAI ◽  
YASUYUKI MURAMATSU
Keyword(s):  
Volcanic Ash ◽  
Transfer Factors ◽  
Volcanic Ash Soil

scholarly journals Preparation and certification of reference materials, brown forest soil (JSAC 0401) and volcanic ash soil (JSAC 0411) for the analysis of trace metals.

2002 ◽  
Vol 51 (4) ◽  
pp. 269-279 ◽  
Author(s):  
Shin-ichi YAMASAKI ◽  
Shoji HIRAI ◽  
Masataka NISHIKAWA ◽  
Yoshinori TAKATA ◽  
Akira TSURUTA ◽  
...  
Keyword(s):  
Trace Metals ◽  
Forest Soil ◽  
Reference Materials ◽  
Volcanic Ash ◽  
Brown Forest Soil ◽  
Volcanic Ash Soil

scholarly journals Pinhole Multistep Centrifuge Outflow Method for Estimating Unsaturated Hydraulic Properties with Small Volume Soil Samples

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1169
Author(s):  
Long Thanh Bui ◽  
Yasushi Mori
Keyword(s):  
Hydraulic Properties ◽  
Volcanic Ash ◽  
Small Volume ◽  
Clayey Soil ◽  
Soil Hydraulic Properties ◽  
Retention Curve ◽  
Volcanic Ash Soil ◽  
Equilibrium Data ◽  
Soil Hydraulic ◽  
Water Holding

If soil hydraulic conductivity or water holding capacity could be measured with a small volume of samples, it would benefit international fields where researchers can only carry a limited amount of soils out of particular regions. We performed a pinhole multistep centrifuge outflow method on three types of soil, which included granite decomposed soil (Masa soil), volcanic ash soil (Andisol soil), and alluvial clayey soil (paddy soil). The experiment was conducted using 2 mL and 15 mL centrifuge tubes in which pinholes were created on the top and bottom for air intrusion and outflow, respectively. Water content was measured at 5, 15, and 30 min after applying the centrifuge to examine the equilibrium time. The results showed that pinhole drainage worked well for outflow, and 15 or 30 min was sufficient to obtain data for each step. Compared with equilibrium data, the retention curve was successfully optimized. Although the curve shape was similar, unsaturated hydraulic conductivities deviated largely, which implied that Ks caused convergence issues. When Ks was set as a measured constant, the unsaturated hydraulic properties converged well and gave excellent results. This method can provide soil hydraulic properties of regions where soil sampling is limited and lacks soil data.

Vertical bearing mechanism of pile foundation in volcanic ash soil

2015 ◽  
pp. 197-198 ◽  
Author(s):  
K. Tomisawa ◽  
T. Yamanishi ◽  
S. Nishimoto ◽  
S. Miura
Keyword(s):  
Pile Foundation ◽  
Volcanic Ash ◽  
Volcanic Ash Soil ◽  
Vertical Bearing

scholarly journals Caucasian clover performance in a year of severe drought

1998 ◽  
pp. 119-125
Author(s):  
R.N. Watson ◽  
F.J. Neville ◽  
N.L. Bell
Keyword(s):  
White Clover ◽  
Growth Rates ◽  
Volcanic Ash ◽  
Severe Drought ◽  
Summer Drought ◽  
Volcanic Ash Soil ◽  
Summer Growth

In a year of spring-summer drought on a sandy volcanic ash soil, ryegrass/caucasian clover (RG/ CC) and RG/white clover (RG/WC) pastures had similar rapid increases in pasture growth rates during September. Growth rates peaked around 25 October (65-70 kg DM/ha/day) for RG/CC and around 14 October (50-60 kg DM/ha/day) for RG/ WC. As drought intensified the declines in pasture growth rates were similar, but delayed by up to 3 weeks for RG/CC. Both pastures reached minimum summer growth rates of

scholarly journals Contribution of Micro Structure to Repeated Loading Effect on Compacted Allophaneous Volcanic Ash Soil

1987 ◽  
Vol 27 (4) ◽  
pp. 23-33 ◽  
Author(s):  
Yoshito Kitazono ◽  
Atsumi Suzuki ◽  
Mitsuhisa Kajiwara ◽  
Shojiro Aramaki
Keyword(s):  
Volcanic Ash ◽  
Repeated Loading ◽  
Micro Structure ◽  
Loading Effect ◽  
Volcanic Ash Soil
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