scholarly journals Quality evaluation of processed clay soil samples

2016 ◽  
Vol 24 ◽  
Author(s):  
Matilda Steiner-Asiedu ◽  
Obed Akwaa Harrison ◽  
Frederick Vuvor ◽  
Kwaku Tano-Debrah
Keyword(s):  
Quality Evaluation ◽  
Clay Soil ◽  
Soil Samples

Studies in tropical soils: IV. Organic transformations in soils, composts and peat

1937 ◽  
Vol 27 (2) ◽  
pp. 162-177 ◽  
Author(s):  
D. W. Duthie
Keyword(s):  
Clay Soil ◽  
Tropical Soils ◽  
Tropical Soil ◽  
Soil Samples ◽  
Organic Transformations ◽  
Surface Layers ◽  
Prairie Soil ◽  
Nitrogenous Substances ◽  
Chemical Characters ◽  
Organic Decomposition

1. Waksman's simplified scheme of fractionation was used in attempts to trace the organic transformations occurring in some tropical samples of composts, soils and peats.2. It was found that a useful partition of the nitrogenous substances into hydrolysable and resistant fractions could be effected by boiling with 5 per cent sulphuric acid for 6 hours.3. Two profile layers of a black calcareous Trinidadian clay soil were compared with two horizons of a prairie soil examined by Waksman & Stevens. The surface layers of both soils were found to be similar in chemical characters, but the lower subsoil layers of the Trinidadian soil gave evidence of a more advanced and profound degree of organic decomposition.4. Serial soil samples, taken from eight undisturbed natural profiles representative of humid tropical soil types occurring in Jamaica and Trinidad, were similarly examined.

The effects of cement and natural zeolite additives on problematic clay soils

2013 ◽  
Vol 20 (4) ◽  
pp. 395-405 ◽  
Author(s):  
Murat Turkoz ◽  
Pinar Vural
Keyword(s):  
Natural Zeolite ◽  
Clay Soil ◽  
Expansive Soils ◽  
Chemical Properties ◽  
Soil Samples ◽  
Clay Soils ◽  
Engineering Structures ◽  
Significant Strength ◽  
Strength Tests ◽  
Physical And Chemical

AbstractDispersive and expansive soils are considered problematic, and these soil properties cause serious problems for many engineering structures. For many years, comprehensive studies have been carried out with the aim of improving the swelling and dispersive qualities of soils by using additives. Each feature in the literature associated with the improvement of the dispersive and swell properties of clay soil with additives was separately evaluated. In this study, the effect of cement and natural zeolite additives on the characteristics of dispersibility and swelling potential of clay soils were investigated. A fixed percentage of cement (3%) plus different percentages of natural zeolite (1%, 3%, 6%, 10%, 15%, and 20%) were mixed with four different clay soil samples. In this context, first, the physical and chemical properties of the soil samples were determined. Next, the swell percentage, swell pressure, crumb, pinhole and unconfined compressive strength tests at different curing times were performed on samples with and without the additive by compressing the sample to achieve particular compaction characteristics. Significant strength value increases depended on curing time, and the properties were improved with the mixture of cement and zeolite additives, depending on the sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) values of clay soil samples with different plasticity characteristics that exhibit dispersive and swell properties. This study not only showed that a mixture of cement and zeolite additives improved the dispersive and swell properties of clay soil samples with four different plasticity characteristics, depending on their SAR and ESP values, but also significant increases in strength values were observed.

scholarly journals Pretreatment of soil samples before NO3-N analysis.

1981 ◽  
Vol 29 (1) ◽  
pp. 15-22
Author(s):  
T. Breimer ◽  
J.H.G. Slangen
Keyword(s):  
Room Temperature ◽  
Clay Soil ◽  
Sandy Loam ◽  
Organic Soil ◽  
Soil Samples ◽  
Clay Soils ◽  
Room Temperature Storage ◽  
N Level ◽  
Temperature Storage ◽  
Long Storage

Storage of sandy, loam and clay soil samples at 35 deg C or 70 deg C for 2-3 days reduced the NO3-N level in the soils. Freezing (-20 deg C), refrigeration (-4 deg C) or storage at room temperature for 2-3 days had little effect on NO3-N levels, although low or room temperature storage for 2 months increased NO3-N levels in the loam and clay soils. Freezing or refrigeration of the sandy soil for 2 months reduced NO3-N levels, while long storage at room temperature markedly increased NO3-N levels in this highly organic soil. (Abstract retrieved from CAB Abstracts by CABI’s permission)

FERTILITY OF A CHERNOZEMIC CLAY SOIL AFTER 50 YEARS OF CROPPING WITH AND WITHOUT FORAGE CROPS IN THE ROTATION

1966 ◽  
Vol 46 (3) ◽  
pp. 207-212 ◽  
Author(s):  
E. D. Spratt
Keyword(s):  
Organic Carbon ◽  
Clay Soil ◽  
Wheat Yield ◽  
Cropping System ◽  
Field Trials ◽  
Soil Samples ◽  
Phosphorus Fertilizer ◽  
Average Yield ◽  
Forage Crops ◽  
Nitrogen Phosphorus

In recent field trials nitrogen–phosphorus fertilizer increased the yield of wheat following summerfallow on a Chernozemic clay soil cropped previously for 50 years in a summerfallow, wheat, wheat rotation. But the fertilizer had no significant effect on wheat yield when the previous cropping system during the 50-year period was summerfallow, wheat, oats, brome–alfalfa for3 years, intertilled corn, wheat, and oats. The beneficial effect of brome–alfalfa in the rotation was reflected in a higher yield of wheat. The average yield of grain per year in the recent trials was 400 kg/ha higher when brome–alfalfa had been included in the rotation.The brome–alfalfa crops produced a better physical condition in the soil. Furthermore, soil samples from the rotation containing brome–alfalfa had higher contents of nitrogen, organic carbon, and total phosphorus than did the samples from the summerfallow, wheat, wheat rotation.

scholarly journals Magnesium-supplying power of some Finnish mineral soils

1973 ◽  
Vol 45 (3) ◽  
pp. 319-324
Author(s):  
Armi Kaila ◽  
Helinä Kettunen
Keyword(s):  
Clay Soil ◽  
Total Yield ◽  
Fine Sand ◽  
Soil Samples ◽  
Silty Clay ◽  
Sand Soil ◽  
Rye Grass ◽  
Heavy Clay ◽  
Initial Content ◽  
Mineral Soils

Uptake of magnesium from a sand, fine sand, muddy clay, silty clay and heavy clay soil under exhaustive cropping with perennial rye grass was studied in green house. An application of 0.5 g Mg as MgSO4 ∙ 7 H2O per the 5-liter pots increased slightly the total yield of rye grass shoots and markedly the amount of Mg harvested in the shoots from the sand and fine sand soils with an initial content of only 14 and 37 ppm exchangeable Mg, respectively. No respond to the application of Mg was detected in the silty clay and heavy clay soils which contained exchangeable Mg 226 and 910 ppm, respectively. The muddy clay soil contained 137 ppm exchangeable Mg, and the application of Mg markedly increased the amount of Mg harvested in the shoots, but brought about a decrease in the yield of shoots. The amount of Mg harvested in the shoots without the application of Mg was only in the sand and fine sand soils higher than the original content of exchangeable Mg. Yet, in all soils except in the muddy clay, the decrease in the content of exchangeable Mg during the cropping was lower than the amount of Mg harvested. This was taken to indicate that some release of nonexchangeable Mg did occur during this trial. According to a rough estimation this mobilization of Mg varied from 0 to 60 ppm, whereas the corresponding release of nonexchangeable K was 500–1000 ppm, except in the sand soil. The »exhaustion Mg», or the sum of Mg harvested in the shoots of rye grass and the exchangeable Mg in the soil after cropping, was in all soils of the same order as the amount of Mg extracted by 0.05 N or 0.1 N HCI from the original soil samples.

scholarly journals Microbial Activity of a Clay Soil Amended with Glucose and Starch Under Live Oaks

2010 ◽  
Vol 36 (2) ◽  
pp. 66-72
Author(s):  
Tomás Martínez-Trinidad ◽  
W. Todd Watson ◽  
Michael Arnold ◽  
Leonardo Lombardini
Keyword(s):  
Carbon Dioxide ◽  
Soil Respiration ◽  
Field Experiment ◽  
Microbial Activity ◽  
Clay Soil ◽  
Soil Samples ◽  
Urban Trees ◽  
Carbon Dioxide Evolution ◽  
Quercus Virginiana ◽  
Effect Of Glucose

Research was conducted to investigate the effect of glucose and starch on soil respiration under live oaks. Soil from a field-grown tree nursery was amended with glucose (C6H12O6), starch (C6H12O6)n, or a 50:50 mixture of both carbohydrates at increasing concentrations (0, 40, 80 and 120 g/L). Solutions were applied once as 10-L drenches within 0.5 m from the trunks of live oaks (Quercus virginiana P. Miller). In a companion study, soil samples treated with the same carbohydrates and concentrations were studied under laboratory conditions. Carbon dioxide evolution was significantly impacted by glucose and starch applications. Glucose applications caused a significant increase in soil respiration compared with the control within a week after application, and it lasted two to three weeks. Elevated soil respiration was most noticeable in the field experiment for starch treatments; however, the increase in soil respiration for higher concentrations (120 g/L) did not become apparent until the fourth week after application and lasted eight to nine weeks. This knowledge about the differing durations and magnitude of glucose and starch on soil respiration may be useful for developing carbohydrate application regimes for soils where increase respiration is desirable for managing urban trees.

Engineering behavior of clay soils stabilized with class C and class F fly ashes

2018 ◽  
Vol 25 (2) ◽  
pp. 273-287 ◽  
Author(s):  
Evren Seyrek
Keyword(s):  
Fly Ash ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Strength Properties ◽  
Soil Samples ◽  
Fly Ashes ◽  
Swell Potential ◽  
Strength Tests ◽  
Problematic Soils ◽  
Swell Pressure

AbstractDamages and economical losses due to problematic soils have caused researchers to conduct many studies for the stabilization of these soils within years. Especially, the use of fly ashes in soil stabilization provides great benefits in contributing to the economy, as well as decreasing the environmental pollution. In the present study, the stabilization characteristics of soil-fly ash mixtures were evaluated in terms of Atterberg limits, compaction characteristics, swell potential and unconfined compressive strength with curing effect. To determine these effects, Catalagzi and Soma fly ashes obtained from Turkey were used in different proportions by weight for stabilization of clay soil samples. It was found that the plasticity index of the soils decreased considerably with the addition of fly ashes, while the strength improved and swell potential decreased. The decreasing trend in the swell percentage and swell pressure values decelerated especially after 25% fly ash additive content and negligible changes occurred. Similar behavior was observed in strength tests. Experimental results show that swelling and strength properties of the soils could be improved by using fly ash and Soma fly ash is far more effective than Catalagzi fly ash.

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