scholarly journals Role of Gypsum and Corn Cobs in Linkage of Peds in Cracking Soils

2018 ◽  
Vol 7 (1) ◽  
pp. 120-127
Author(s):  
S. K. Essa ◽  
Raid Shaalan Jarallah
Keyword(s):  
Organic Matter ◽  
Moisture Content ◽  
Clay Minerals ◽  
Control Sample ◽  
College Of Agriculture ◽  
Relative Moisture Content ◽  
X Ray ◽  
Corn Cobs ◽  
Relative Moisture

To study role of gypsum and corn cobs in linkage of fractions in cracking soils. Three soils (Al-Diwaniya , Al-Wihda and college of Agriculture / Abu Ghraib) were chosen for this study . They were  treated with two levels of gypsum (0.5 and 1) % with one level (4%) of corncobs . In this experiment , 2 kg of each studied soil were treated with same levels of corn cobs and gypsum above and incubated at 30 + 2 °C for 90 days and 80% relative moisture content at 33 kpa. And then the soils were sieved with 1 mm sieve to measured the x-ray diffractions . The results showed : The intensity of clay minerals peaks which treated with gypsum and corn cobs were decreased comparing with control sample. We believed that the gypsum should be facculated on clay minerals surfaces and mask them to appear clearly , and suggested that the gypsum was played an important role in conjugated of soil particles. Results of X-ray diffractions showed that there was no evidence of interaction between organic matter (corn cobs) and clay mineral inter layers.  

scholarly journals The Study of Corn Cobs and Gypsum AddingIn Some Physical Characters and Organic Matterof Cracking Soils from Middle of Iraq

2018 ◽  
Vol 7 (2) ◽  
pp. 123-132
Author(s):  
Raid Sh. Jarallah ◽  
S. K.Essa
Keyword(s):  
Organic Matter ◽  
Calcium Sulfate ◽  
Aggregate Stability ◽  
Clay Content ◽  
Soil Aggregate ◽  
Soil Aggregate Stability ◽  
Relative Moisture Content ◽  
Corn Cobs ◽  
Relative Moisture ◽  
Four Levels

In order to investigate the role corn cobs and gypsum in some physical charactersand organic matter ofclayey cracks and their properties. Seven soils sites (Afak, Al-Diwaniyah, Al-Taleea, Babel, Agriculture college, Al-Wahda and Al-Raid project) There are three types of treatments as follows: -          Corn cobs was applied in four levels (0 . 10 . 20 and 40) g.kg-1 -          Gypsum (calcium sulfate) applied in four levels (0 , 5 , 7.5 and 10) g.kg-1. -          Treatments of interaction between corn cobs and gypsum. Corn cobs , gypsum and their interaction were applied in same levels above. In this experiment , 2 kg of each studied soil were treated with same levels of corn cobs and gypsum above and incubated at 30 + 2 °C for 90 days and 80% relative moisture content at 33 kpa. The results were summarized as :Soil aggregate stability (MWD) and organic matter values were increased , while modules of rupture and (COLE) values were decreased , with increasing of gypsum and corn cobs applying. Also, results showed that the decreasing of (COLE) values were depending on the clay content and interaction treatments , between corn cobs and gypsum. The decreasing of (COLE) values were the highest in the clayey cracks disappeared treatments.

Influence of soil organic matter on sulfate retention in two Podzols in Quebec, Canada

1999 ◽  
Vol 79 (1) ◽  
pp. 103-109 ◽  
Author(s):  
F. Courchesne ◽  
J.-F. Laberge ◽  
A. Dufresne
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Ammonium Oxalate ◽  
X Ray Diffraction ◽  
Weighted Mean ◽  
Fine Silt ◽  
Mineral Horizon ◽  
Organic C ◽  
X Ray

The role of soil organic matter (OM) on SO4 retention was investigated by comparing OM content, SO4 retention, and the distribution of Fe, Al and Si compounds in OM-poor (Grands-Jardins, PGJ) and OM-rich (Hermine, HER) Podzols from Québec, Canada. At both sites, four pedons were sampled by horizon; soil pH in H2O, organic C, phosphate-extractable SO4 and, sodium pyrophosphate, acid ammonium oxalate and dithionite-citrate-bicarbonate (DCB) extractable Fe, Al and Si were measured for each mineral horizon. The mineralogy of the clay (<2 µm) and fine silt (2–20 µm) fractions of selected horizons was determined by X-ray diffraction (XRD) and infrared spectroscopy (IR). Weighted mean organic C and pyrophosphate extractable Fe and Al contents were significantly higher in the HER than in the PGJ sola, while the PGJ soils were richer in amorphous inorganic Al. No trends were observed for inorganic Fe compounds. Chemical dissolution and IR allowed the identification of short-range ordered aluminosilicates, probably allophane, in the OM-poor and slightly acidic to neutral PGJ soils. These materials were absent from the OM-rich and acidic HER soils. Phosphate extractions showed that the weighted mean native SO4 content was five times higher in the PGJ than in the HER soil. Finally, native SO4 was strongly related to inorganic Fe, Al and Si (associated with allophane) at PGJ but only to inorganic Fe at HER. These results indicate that OM indirectly affects SO4 sorption through the influence organic substances exerts on the nature and distribution of pedogenic Fe, Al and Si compounds, such as allophane, in Podzolic profiles. Key words: Organic matter, sulfate, imogolite, allophane, silica, Podzol

scholarly journals Study on the Mitigative Effect of Controlled Permeable Formwork (CPF) Liner on Early-Age Shrinkage of Box-Girder Concrete

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Jianxiong Ye ◽  
Linwen Yu ◽  
Yong Chen
Keyword(s):  
Moisture Content ◽  
Concrete Surface ◽  
Early Age ◽  
Working Mechanism ◽  
Box Girder ◽  
Relative Moisture Content ◽  
Relative Moisture ◽  
Bridge Structures ◽  
Girder Bridge ◽  
Surface Covering

Because of its high binder content and severe construction environment, early-age cracking is one of the most important threats to concrete used in continuous box-girder bridge structures. In this study, controlled permeable formwork (CPF) liner was used to mitigate the early-age shrinkage and reduce the early-age cracking risk of box-girder concrete. Early-age shrinkage was measured by a noncontact method and started at 30 min after adding mix water until 7 d. Internal relative moisture content and pore distribution tests were also carried out to reveal the working mechanism of CPF liner. The results show that covering the concrete surface with CPF liner decreased early-age shrinkage significantly. Under the temperature of 20°C and the relative humidity of 60%, two-surface-covering and three-surface-covering CPF liner on concrete decreased the shrinkage by 44% and 48%, respectively, at 7 d compared with concrete without CPF liner covered on it. The main reason is that CPF liner enhanced the internal relative moisture content and resulted in better performance of the surface concrete.

Myxomycetes on the bark of Banksia attenuata and B. menziesii (Proteaceae)

2006 ◽  
Vol 54 (4) ◽  
pp. 357 ◽  
Author(s):  
C. C. Jordan ◽  
M. H. Brims ◽  
E. J. Speijers ◽  
E. M. Davison
Keyword(s):  
Moisture Content ◽  
New Records ◽  
Common Species ◽  
Species Assemblage ◽  
Decomposition Level ◽  
Moist Chamber ◽  
Relative Moisture Content ◽  
Relative Moisture ◽  
Banksia Attenuata ◽  
Chamber Technique

Myxomycetes on the bark of dead Banksia attenuata and B. menziesii from the Perth metropolitan area of Western Australia were surveyed by the moist chamber technique, to determine whether the flora was similar on both hosts and what were the most important variables that determined the distribution of the most common species. Twenty-seven species of myxomycetes were recovered, including six new records for Australia (Comatricha rigidireta, Echinostelium elachiston, Paradiacheopsis cf. cribrata, P. rigida, Stemonitopsis amoena and S. cf. hyperopta). Members of the order Stemonitales comprised the largest number of species, whereas members of the Liceales occurred on the most bark pieces. The most common species were Licea kleistobolus, Echinostelium minutum, Comatricha elegans, Cribraria minutissima and Paradiacheopsis fimbriata. Overall, B. menziesii and B. attenuata had very similar myxomycete productivity, diversity and species assemblage, as did the tops and bottoms of the logs. It was concluded that they provided very similar microhabitats for myxomycetes. Both pH and the relative moisture content of the bark had an effect on myxomycete productivity. Bark decomposition level, pH and bark surface (top or bottom) were the most important variables determining the distribution of the most common myxomycete species.

The Role of Clay Minerals in the Preservation of Organic Matter in Sediments of Qinghai Lake, NW China

2009 ◽  
Vol 57 (2) ◽  
pp. 213-226 ◽  
Author(s):  
Bingsong Yu ◽  
Hailiang Dong ◽  
Hongchen Jiang ◽  
Guo Lv ◽  
Dennis Eberl ◽  
...  
Keyword(s):  
Organic Matter ◽  
Clay Minerals ◽  
Qinghai Lake ◽  
Nw China

Relative Impact of Kernel Thickness and Moisture Content on Rice Fissuring during Drying

2018 ◽  
Vol 34 (1) ◽  
pp. 239-246 ◽  
Author(s):  
Zephania R. Odek ◽  
Terry J. Siebenmorgen ◽  
Andronikos Mauromoustakos
Keyword(s):  
Moisture Content ◽  
Drying Characteristics ◽  
X Ray ◽  
X Ray Imaging ◽  
Rough Rice ◽  
Rice Drying ◽  
Milling Yield ◽  
Moisture Desorption

Abstract.Individual kernel thickness and moisture content (MC) vary within rice panicles. These variations affect the drying characteristics of rice kernels and consequently, the milling yield. This study utilized an X-ray system augmented with an in-situ rice drying apparatus that enabled fissure detection in rough rice kernels during drying and tempering. Rough rice kernels of two long-grain cultivars (Roy J and CL XL745), each at two MC levels (20% and 16%, w.b.), were fractionated into three thickness fractions (thin &lt;1.98 mm, medium 1.98 - 2.03 mm, and thick &gt;2.03 mm). Kernels from each of the 12 sub-lots were dried and tempered under controlled air conditions. Fissured kernel percentages (FKP) were determined from X-ray images taken before, during, and after drying and tempering. Kernel thickness and MC both affected moisture desorption fissuring. Generally, as kernel thickness increased, the FKP increased for high-MC lots. In regards to MC, high-MC lots were more prone to fissuring than the low-MC lots. Overall, these findings highlight the role of kernel properties on fissuring during drying. Keywords: Kernel fissuring, Kernel thickness, Moisture content, Rice drying, X-ray imaging.

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