scholarly journals Spatial variability of fertility status in soils of Dima Hasao district of Assam

2021 ◽  
Vol 23 (3) ◽  
pp. 368-374
Author(s):  
A. BASUMATARY ◽  
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Organic Carbon Content ◽  
Critical Limit ◽  
Available Nitrogen ◽  
Cu Content ◽  
Fertility Status ◽  
High Organic Carbon Content

Two hundred fifty geo-referenced surfaces (0-15 cm) soil samples were collected and analysed for macronutrients and micronutrients to study fertility status in soils of Dima Hasao district of Assam and their relationship with some important soil properties. Soils of the district were found to be extremely acidic to slightly acidic in reaction with a low to high organic carbon content and low in cation exchange capacity. The soil of the district indicated that the available nitrogen, phosphorus and potassium status was observed to the tune of 14.0 %,7.2% and 67.2% under low and 86.0 %, 92.8 % and 32.8 %under medium categories, respectively. The overall percent deficient of exchangeable calcium, magnesium and available sulphur in soils was 25.6, 30.4 and 6.8 %, respectively. Based on critical limit, all soils were adequately supplied with DTPA-extractable Fe, Mn and Cu content. In respect of zinc and boron, soils exhibited 90.4 and 73 per cent under sufficient, while, 2.4 and 12 per cent were found deficient in DTPA -Zn and HWS-B, respectively. Soil pH and EC showed positive correlation with macro nutrients and negative correlation with micronutrients. The macro- and micronutrient showed significant positive relation with soil organic carbon and cation exchange capacity.

scholarly journals Volume‐related quantification of organic carbon content and cation exchange capacity of macropore surfaces in Bt horizons

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Martin Leue ◽  
Daniel Uteau ◽  
Stephan Peth ◽  
Steffen Beck‐Broichsitter ◽  
Horst H. Gerke
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Carbon Content ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Organic Carbon Content

scholarly journals Estimation of cation-exchange capacity in routine soil testing

1986 ◽  
Vol 58 (1) ◽  
pp. 1-7
Author(s):  
Raina Niskanen ◽  
Antti Jaakkola
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Carbon Content ◽  
Cation Exchange Capacity ◽  
Ammonium Acetate ◽  
Exchange Capacity ◽  
Regression Equation ◽  
Soil Testing ◽  
Organic Carbon Content ◽  
Exchangeable Ca

The efficiency of the soil testing method used in Finland for predicting the effective cation-exchange capacity was studied in a material of 430 topsoil samples. The effective cation-exchange capacity was estimated 1) by summation of exchangeable Ca, Mg and acidity displaced by unbuffered 1 M KCI and 2) by summation of exchangeable Ca, Mg, K and Na displaced by neutral 1 M ammonium acetate and exchangeable acidity. In soil testing, Ca, Mg and K were extracted by acid ammonium acetate and soil pH measured in water-suspension. The estimates of the effective CEC were highly correlated and dependent on the clay and organic carbon content and pH(CaCl2) of the soil, the coefficient of multiple determination being over 80 %. Exchangeable Ca was the dominating cation. The proportion of Ca of the effective CEC was about 80 %. Acid ammonium acetate-extractable Ca together with pH(H2O) explained over 80 % of the variation in the effective CEC. For the whole material consisting of mineral soils with great variations in texture, organic carbon content and properties under evaluation, the regression equation predicting the effective CEC (KCI method) was CEC (mval/kg) = 309—56.8pH(H2O) + 0.085Ca(mg/l). Only 16 % of the estimates of the effective CEC calculated with this regression equation deviated more than 15 % from the measured values.

scholarly journals A Study of Physio-Chemical Properties of Healthy and Declined Nagpur Mandarin Orchards

2020 ◽  
pp. 70-74
Author(s):  
Prashant Joshi ◽  
Dhiraj Kadam ◽  
Shakti Tayde ◽  
Yogesh Dharmik
Keyword(s):  
Electrical Conductivity ◽  
Organic Carbon ◽  
Cation Exchange ◽  
Bulk Density ◽  
Cation Exchange Capacity ◽  
Soil Depth ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Nitrogen And Phosphorus ◽  
Available Nitrogen

The present investigation was carried out to characterize and classify some typical healthy and declined Nagpur mandarin gardens in Warud and Morshi Tahsil’s of Amravati District (M.S.). Total forty two representative surface and depth soil samples from healthy and declined Nagpur mandarin gardens were collected and analyzed for various physico-chemical properties. The findings revealed that the texture of soil is clayey (40 - 59 % clay in healthy gardens and 47.4 - 61.4 % clay in declined gardens). The bulk density and porosity in healthy gardens ranged 1.51 - 1.67 mg.m-3, 35.85 - 43.02 % in declined gardens; it varied from 1.51 to 1.66 mg.m-3 and 25.85 to 43.02 % respectively. The pH, organic carbon and CaCO3 content in healthy gardens soils varies 7.5 - 8.0, 4.8 - 9.0 g kg-1, 5.35 - 8.31 % and in declined gardens it’s 7.7 - 8.2, 1.95 - 3.75 gm kg-1, 6.71 - 10.53 % respectively. The electrical conductivity and cation exchange capacity of healthy gardens soil was noticed 0.21 - 0.28 d.Sm-1, 45.92 - 55.53 c.mol (p+) kg ha-1 and in declined gardens it varied 0.22 - 0.32 d.Sm-1, 46.20 - 51.92 c.mol (p+) kg ha-1 respectively. Further, no significant difference was found in clay, bulk density, porosity, electrical conductivity and cation exchange capacity in healthy and declined gardens; however soil reaction was found high in declined gardens than healthy gardens. Organic carbon content was high and free lime content was reported lower in healthy gardens than declined gardens. Study on depth wise distribution showed that bulk density, pH and electrical conductivity increase with soil depth. Organic carbon and cation exchange capacity decreases with soil depth. The available nitrogen, phosphorus and potassium content of healthy gardens surface soils are ranged 206.0 - 273.7 kg ha-1, 25.0 - 38.3 kg ha-1, 324 - 672 kg ha-1 and in declined gardens it’s varied as 135.4 - 206.8 kg ha-1, 19.8 - 23.3 kg ha-1, 364 - 750.4 kg ha-1 respectively. Available nitrogen and phosphorus content in healthy gardens found more supporting than declined ones. Depth wise distribution showed that available nitrogen and phosphorus showed decreasing trend with the soil depth.

SORPTION AND RELEASE OF CADMIUM IN SOME CANADIAN SOILS

1979 ◽  
Vol 59 (2) ◽  
pp. 119-130 ◽  
Author(s):  
S. SHAH SINGH
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Carbon Content ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Experimental Results ◽  
Major Portion ◽  
Organic Carbon Content ◽  
Canadian Soils

Sorption and release of Cd was determined in 10 Canadian soils. Experimental results showed that soils exhibit large capacities to adsorb Cd; however, a major portion of adsorbed Cd was released by NaCl extraction. The amount of Cd not released by NaCl (fixed Cd) was correlated to the cation exchange capacity, pH and organic carbon content of soils. The "fixation" reactions of Cd did not have priority over adsorption reactions.

EVALUASI PERUBAHAN KUALITAS TANAH PADA LAHAN BEKAS PENAMBANGAN NIKEL DI PULAU GEBE

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Mardi Wibowo
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Mining Activity ◽  
Evaluation Activity ◽  
Land Quality ◽  
Environment Quality

Since year 1977 until 2005, PT. ANTAM has been exploited nickel ore resources at Gebe Island – Center ofHalmahera District – North Maluku Province. Mining activity, beside give economically advantages also causedegradation of environment quality espicially land quality. Therefore, it need evaluation activity for change ofland quality at Gebe Island after mining activity.From chemical rehabilitation aspect, post mining land and rehabilitation land indacate very lack and lackfertility (base saturated 45,87 – 99,6%; cation exchange capacity 9,43 – 12,43%; Organic Carbon 1,12 –2,31%). From availability of nutrirnt element aspect, post mining land and rehabilitation land indicate verylack and lack fertility (nitrogen 0,1 – 1,19%). Base on that data, it can be concluded that land reclamationactivity not yet achieve standart condition of chemical land.Key words : land quality, post mining lan

Sorption of Anionic Pentachlorophenol (PCP) in Aquatic Environments: The Effect of pH

1992 ◽  
Vol 25 (11) ◽  
pp. 41-48 ◽  
Author(s):  
Y. Shimizu ◽  
S. Yamazaki ◽  
Y. Terashima
Keyword(s):  
Organic Carbon ◽  
Aqueous Phase ◽  
Cation Exchange Capacity ◽  
Clay Content ◽  
Exchange Capacity ◽  
Poor Correlation ◽  
Aquatic Environments ◽  
Organic Carbon Content ◽  
Swelling Clay ◽  
Ph Range

The sorption of pentachlorophenol (PCP, pKa’ = 4.75) onto natural solids from aqueous phase was investigated by batch sorption experiments. The experimental aqueous phase was prepared for set values of pH (2 to 12) and ionic strength (0.1 M). Experimental results indicated that the sorption decreased with increasing pH over the entire pH range tested. A simple mathematical model, based on the hypotheses that the sorption coefficients of non-ionized and ionized species are different and the pH has only negligible effect on the natural solid characteristics, was applied to the pH range between 6 and 8, and the sorption coefficients (Kd) of both species were estimated. The Kd of ionized species (phenolate anion) was smaller than that of non-ionized species. The Kd of both species had poor correlation to the organic carbon content of natural solids. The Kd, however, correlated well with the swelling clay content and cation exchange capacity of natural solids. These results indicated that the sorption of PCP was not controlled by the organic carbon referenced hydrophobic sorption. For broader pH range (i.e., below 6 or above 8), the dependence of the natural solid characteristics on pH must be additionally included in the model.

scholarly journals Effect of different amounts of biochar on meadow soil characteristics and maize yields over three years

BioResources ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. 4194-4209
Author(s):  
Zhihui Wang ◽  
Chunshuang Tang ◽  
Hongyi Wang ◽  
Changjiang Zhao ◽  
Dawei Yin ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Total Nitrogen ◽  
Cation Exchange Capacity ◽  
Soil Phosphorus ◽  
Soil Characteristics ◽  
Exchange Capacity ◽  
Kernel Weight ◽  
Meadow Soil ◽  
Maize Yields

To evaluate the effect of biochar on soil characteristics and maize yields in meadow soil, a three-year field experiment was performed using different amounts of biochar (0, 10, 20, 40, and 80 t/ha). The soil pH decreased over time when biochar was applied to weakly basic soil. Single biochar applications increased the organic carbon, total nitrogen, available K, and cation exchange capacity for three continuous years, in proportion to the amount of biochar applied. However, as time progressed, the soil organic carbon, total nitrogen, available K, and cation exchange capacity began to decrease. The biochar stimulated the availability of soil phosphorus in the meadow soil and stably increased the available P content in the soil for three years. For maize, the biochar application decreased the occurrence of barren ear tips and increased the ear length, grain number per row, 100-kernel weight, and yield. When the single applications of biochar were greater than 40 t/ha, the soil characteristics showed continuous improvements and the maize yields stably increased for three years.

Sign in / Sign up

Export Citation Format

Share Document