A MINERALOGICAL AND CHEMICAL STUDY OF THE DIKELAND SOILS OF NOVA SCOTIA

1958 ◽  
Vol 38 (2) ◽  
pp. 173-188 ◽  
Author(s):  
J. E. Brydon ◽  
H. Heystek
Keyword(s):  
Organic Matter ◽  
Nova Scotia ◽  
Clay Mineral ◽  
Clay Fraction ◽  
Organic Matter Content ◽  
Chemical Study ◽  
Matter Content ◽  
Bacterial Reduction ◽  
Free Iron ◽  
High Organic Matter Content

Six profiles taken from the dikeland areas of Nova Scotia were examined chemically and mineralogically. The mineralogy of the various layers was similar within and between profiles, except that the reddish layers contained goethite while the grey layers did not. The latter were very strongly acidic and had an unusually high organic matter content due to burial of undecomposed vegetation by tidal sediments. While they contained no goethite, they had a significant amount of "free iron". It is proposed that where sufficient organic matter was available the grey layers were produced by anaerobic bacterial reduction of the reddish iron oxides.Quartz was the predominant non-clay mineral associated with mica, feldspar and chlorite. The clay fraction consisted of illite with characteristics of muscovite, chlorite similar to "swelling" chlorite, kaolinite and montmorillonite.

scholarly journals Characterisation of the geochemical heterogeneity of the Rupel Clay Member in the Netherlands

2016 ◽  
Vol 95 (3) ◽  
pp. 269-281 ◽  
Author(s):  
M. Koenen ◽  
J. Griffioen
Keyword(s):  
Organic Matter ◽  
The Netherlands ◽  
Clay Mineral ◽  
Clay Fraction ◽  
Organic Matter Content ◽  
Matter Content ◽  
Coarse Grained ◽  
Carbonate Content ◽  
X Ray ◽  
Boom Clay

AbstractSamples from Rupel Clay across the Netherlands were analysed for the assessment of its heterogeneity in geochemistry and mineralogy. X-ray fluorescence (XRF) and bulk and clay fraction X-ray diffraction (XRD) analyses of 152 samples from 17 different cores are presented and statistically interpreted. The results show a wide variation in the quartz, feldspar, clay mineral and carbonate content between the different samples. Factor analysis showed that the main variance between the samples can be explained by the clay mineral and quartz concentration, the carbonate content and pyrite plus organic matter. In the south of the Netherlands, the Rupel Clay is more quartz-rich and coarse grained. In addition, the clay is heterogeneous, varying with location and depth, consistent with observations for Belgium Boom Clay. Towards the north, the Rupel Clay becomes more clay-rich, finer grained and more homogeneous, both laterally and with depth. In addition, the clay has a relatively high carbonate and organic matter content. The pyrite content does not show any trends with location and depth. The differences between north and south are explained by the variations in depositional setting within the southern North Sea Basin.

scholarly journals Comparison of Total Nitrogen Methods Applied for Histosols and Soil Horizons with High Organic Matter Content

2006 ◽  
Vol 37 (7-8) ◽  
pp. 939-943 ◽  
Author(s):  
Marcos Gervasio Pereira ◽  
Ademar Espindula ◽  
Gustavo Souza Valladares ◽  
Lúcia Helena Cunha dos Anjos ◽  
Vinícius de Melo Benites ◽  
...  
Keyword(s):  
Organic Matter ◽  
Total Nitrogen ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Horizons ◽  
High Organic Matter Content ◽  
High Organic Matter

Determination of glyphosate in surface water with high organic matter content

2017 ◽  
Vol 24 (9) ◽  
pp. 7880-7888 ◽  
Author(s):  
Vahur Toss ◽  
Ivo Leito ◽  
Sergei Yurchenko ◽  
Rene Freiberg ◽  
Anneli Kruve
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Organic Matter Content ◽  
Matter Content ◽  
High Organic Matter Content ◽  
High Organic Matter

scholarly journals Evaluation of Improved Model to Accurately Monitor Soil Water Content

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3441
Author(s):  
Jingyu Ji ◽  
Junzeng Xu ◽  
Yixin Xiao ◽  
Yajun Luan
Keyword(s):  
Organic Matter ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Texture ◽  
Irrigation Management ◽  
Clay Fraction ◽  
Organic Matter Content ◽  
Matter Content ◽  
Improved Model

The accurate monitoring of soil water content during the growth of crops is of great importance to improve agricultural water use efficiency. The Campbell model is one of the most widely used models for monitoring soil moisture content from soil thermal conductivities in farmland, which always needs to be calibrated due to the lack of adequate original data and the limitation of measurement methods. To precisely predict the water content of complex soils using the Campbell model, this model was evaluated by investigating several factors, including soil texture, bulk density and organic matter. The comparison of the R2 and the reduced Chi-Sqr values, which were calculated by Origin, was conducted to calibrate the Campbell model calculated. In addition, combining factors of parameters, a new parameter named m related to soil texture and the organic matter was firstly introduced and the original fitting parameter, E, was improved to an expression related to clay fraction and the organic matter content in the improved model. The soil data collected from both the laboratory and the previous literature were used to assess the revised model. The results show that most of the R2 values of the improved model are >0.95, and the reduced Chi-Sqr values are <0.01, which presents a better matching performance compared to the original. It is concluded that the improved model provides more accurate monitoring of soil water content for water irrigation management.

scholarly journals Bulk Density Prediction for Histosols and Soil Horizons with High Organic Matter Content

2017 ◽  
Vol 41 (0) ◽  
Author(s):  
Sidinei Julio Beutler ◽  
Marcos Gervasio Pereira ◽  
Wagner de Souza Tassinari ◽  
Michele Duarte de Menezes ◽  
Gustavo Souza Valladares ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bulk Density ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Horizons ◽  
High Organic Matter Content ◽  
Density Prediction ◽  
High Organic Matter

scholarly journals Maize response to nitrogen fertilization timing in two tillage systems in a soil with high organic matter content

2007 ◽  
Vol 31 (3) ◽  
pp. 507-517 ◽  
Author(s):  
Luis Sangoi ◽  
Paulo Roberto Ernani ◽  
Paulo Regis Ferreira da Silva
Keyword(s):  
Organic Matter ◽  
Grain Yield ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Tillage ◽  
Tillage Systems ◽  
High Organic Matter Content ◽  
High Organic Matter ◽  
Tillage System ◽  
Maize Response

No-tillage systems, associated to black oat as preceding cover crop, have been increasingly adopted. This has motivated anticipated maize nitrogen fertilization, transferring it from the side-dress system at the stage when plants have five to six expanded leaves to when the preceding cover crop is eliminated or to maize sowing. This study was conducted to evaluate the effects of soil tillage system and timing of N fertilization on maize grain yield and agronomic efficiency of N applied to a soil with high organic matter content. A three-year field experiment was conducted in Lages, state of Santa Catarina, from 1999 onwards. Treatments were set up in a split plot arrangement. Two soil tillage systems were tested in the main plots: conventional tillage (CT) and no-tillage (NT). Six N management systems were assessed in the split-plots: S1 - control, without N application; S2 - all N (100 kg ha-1) applied at oat desiccation; S3 - all N applied at maize sowing; S4 - all N side-dressed when maize had five expanded leaves (V5 growth stage); S5 - 1/3 of N rate applied at maize sowing and 2/3 at V5; S6 - 2/3 of nitrogen rate applied at maize sowing and 1/3 at V5. Maize response to the time and form of splitting N was not affected by the soil tillage system. Grain yield ranged from 6.0 to 11.8 t ha-1. The anticipation of N application (S2 and S3) decreased grain yield in two of three years. In the rainiest early spring season (2000/2001) of the experiment, S4 promoted an yield advantage of 2.2 t ha-1 over S2 and S3. Application of total N rate before or at sowing decreased the number of kernels produced per ear in 2000/2001 and 2001/2002 and the number of ears produced per area in 2001/2002, resulting in reduced grain yield. The agronomic efficiency of applied N (kg grain increase/kg of N applied) ranged from 13.9 to 38.8 and was always higher in the S4 than in the S2 and S3 N systems. Short-term N immobilization did not reduce grain yield when no N was applied before or at maize sowing in a soil with high organic matter content, regardless of the soil tillage system.

Sign in / Sign up

Export Citation Format

Share Document