Shrinkage of artificially dried soil samples collected at different depths in a clay soil

1980 ◽  
Vol 143 (5) ◽  
pp. 518-523
Author(s):  
G. Petruzzelli ◽  
M. Pagliai ◽  
G. Guidi
Keyword(s):  
Clay Soil ◽  
Soil Samples ◽  
Different Depths

scholarly journals The Effect of Organic Matter Application on Phosphorus Status in the Calcareous Soil

2017 ◽  
Vol 14 (1) ◽  
pp. 107-116
Author(s):  
Baghdad Science Journal
Keyword(s):  
Sodium Bicarbonate ◽  
Field Experiment ◽  
Block Design ◽  
Soil Samples ◽  
Extractable P ◽  
Randomized Complete Block Design ◽  
Different Depths ◽  
Phosphorus Status ◽  
Physical And Chemical ◽  
Soil Constituents

A field experiment is conducted to study the effect of different levels of peat (0, 25, 50, 75, and 100 Mg ha-1 to uncropped and cropped soil to wheat. Soil samples are taken in different period of time (0, 3, 30, 60, 90, 120, and 180 days after cultivation to determine (NaHCO3-Exteractable P at 3 different depths (0-10, 10-20, and 20-30 cm). Field Experiment is conducted in a randomized complete block design (RCBD) with four replicates. Wheat, Al-Rasheed variety, is cultivated as a testing crop. The entire field is equally dived in two divisions. One of the two divisions is cultivated to wheat and the second is left uncropped. The effect of five levels of peat namely 0, 25, 50, 75, 100 Mg ha-1 is investigated. Soils are fully analyzed to determine its physical and chemical characteristics. The soil samples are collected after 3, 30, 60, 90, 120, and 180 days for determining essential parameters and indicators that reflect the effect of the level of peat applications. Sodium bicarbonate - extractable P in uncropped and cropped soils at all depths, markedly decreases with time after peat application which has been attributed to plant uptake and rapid reaction of P with soil constituents. Sodium bicarbonate - extractable P with time in soil receiving 50 Mg ha-1 in both uncropped and cropped soil linearly decreases with the time of cultivation

scholarly journals Study on Carbon Stock of Leasehold Forests of Katakuti VDC, Dolakha District

2014 ◽  
Vol 5 ◽  
pp. 63-67
Author(s):  
Tshering Dolma Lama ◽  
Ram Asheshwar Mandal
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Leaf Litter ◽  
Random Sampling ◽  
Carbon Stock ◽  
Carbon Stocks ◽  
Soil Samples ◽  
Total Carbon ◽  
Different Depths ◽  
Total Carbon Stock

A study was carried on ten leasehold forests of Katakuti VDC, Dolakha district to estimate the carbon stock. Random sampling was used to collect the biophysical data of trees/ poles, sapling, root and leaf litter, herb and grass. Then, the biomass was calculated using the respective equation and the calculated biomass stock was converted into carbon stock multiplying with 0.47. Similarly, the soil samples were collectewd from different depths of 0-10 cm, 10-20 cm and 20-30 cm to determine the soil organic carbon. Lastly, all analyzed data were compiled to get total carbon stocks. The result showed that the estimated total carbon stock per ha was found to be highest in Srijana leasehold forest with 125.493 t C/ha. The estimated total carbon stock of 10 leasehold forest was found to be 1439.033 tons. Here, Leasehold forests have been an emerging and successful example in conserving forests in epal. So, it is recommended to extend such studies in other parts of Nepal. DOI: http://dx.doi.org/10.3126/init.v5i0.10255   The Initiation 2013 Vol.5; 63-67

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 EVALUATION OF SOILBORNE PLANT PATHOGENIC FUNGAL COUNT IN VARIOUS LAND USE TYPES OF DISTRICT OKARA

2018 ◽  
Vol 30 (1) ◽  
pp. 69
Author(s):  
Sumaira Naz ◽  
Salik N. Khan ◽  
Muhammad N. Chaudhry
Keyword(s):  
Land Use ◽  
Fungal Pathogens ◽  
Soil Samples ◽  
Malt Extract ◽  
Forest Land ◽  
Barren Land ◽  
Land Use Types ◽  
Different Depths ◽  
Penicillium Spp ◽  
Made In

A field survey was conducted in district Okara to determine existing plant pathogenic fungal count in various land use types. The target sites were classified as orchard, barren land, fallow land, cultivated land and forest land use types. Field soil samples were collected from these land use types at different depths of 15, 30 and 45 cm respectively. Dilution of soil samples was made in sterilized distilled water and 1ml was poured on to the malt extract agar (MEA) medium in 90 mm diameter Petri plates incubated at 25±2°C for 5-7 days. Purified fungal colonies of Mucor spp., Fusarium solani, Aspergillus niger, Penicillium spp., Alternaria alternata, Curvularia spp., Rhizopus spp., and Helminthosporium spp. on potato dextrose agar (PDA) medium were identified based on their morphological descriptions. These fungal counts were recovered from the soil at 30 cm depth which indicates an alarming situation for deep-rooted crops to soilborne fungal pathogens infestation in future.

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