Organic matter recovery in sandy soils under bush fallow in southern Mozambique

The hydrophobic organic skins on sand grains were resistant to removal by solvents such as cold water, concentrated acid, diethyl ether, ethanol, benzene, chloroform, and acetone. Prolonged treatment with hot diethyl ether, ethanol, and benzene removed part of the coating. Treatment with dilute solutions of alkali removed the skin as suspended particles. Compounds within the very stable humic fraction of the soil organic matter appeared to be mainly responsible for water repellence in soils. Deposits of fresh organic materials could also produce water repellent properties.

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Survival of Rhizobium japonicum as Affected by Different Levels of Moisture and Organic Matter in Sandy Soils

Zentralblatt für Mikrobiologie ◽

10.1016/s0232-4393(11)80244-1 ◽

1991 ◽

Vol 146 (7-8) ◽

pp. 545-547 ◽

Cited By ~ 2

Author(s):

L.N. Verma ◽

A.K. Rawat

Keyword(s):

Organic Matter ◽

Sandy Soils ◽

Rhizobium Japonicum ◽

Different Levels

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THE EFFECT OF ORGANIC MATTER APPLICATIONS ON THE SATURATED HYDRAULIC CONDUCTIVITY AND AVAILABLE WATER-HOLDING CAPACITY OF SANDY SOILS

Applied Ecology and Environmental Research ◽

10.15666/aeer/1702_31373146 ◽

2019 ◽

Vol 17 (2) ◽

pp. 3137-3146 ◽

Cited By ~ 1

Author(s):

Y DEMİR ◽

A DOĞAN DEMİR

Keyword(s):

Organic Matter ◽

Hydraulic Conductivity ◽

Sandy Soils ◽

Saturated Hydraulic Conductivity ◽

Water Holding Capacity ◽

Available Water ◽

Water Holding

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The Potential Applications of Optical Dating to the Sandy Uplands of East Texas and Northwest Louisiana

Index of Texas Archaeology Open Access Grey Literature from the Lone Star State ◽

10.21112/.ita.1998.1.44 ◽

1998 ◽

Author(s):

Charles D. Frederick ◽

Mark D. Bateman

Keyword(s):

Organic Matter ◽

Radiocarbon Dating ◽

Sandy Soils ◽

Buried Soils ◽

East Texas ◽

Optical Dating ◽

Landform Evolution ◽

Sediment Transportation ◽

Potential Applications ◽

Geomorphic Processes

The fine, sandy soils of East Texas and Northwest Louisiana have been the source of archaeological debate for some time. This discourse concerns the mode of burial of cultural material in the easily eroded soils and the mechanics of recent (Holocene) landform evolution. Because these deposits are typically well-drained, organic matter does not preserve well, thus hindering the dating of the geomorphic events that figure prominently in their development and the prehistoric occupations which lie buried throughout uplands of this region. A relatively new dating technique, optical dating, has much to offer this region and the archaeological community as it measures the period of time that has elapsed since sand grains were last exposed to sunlight. Hence, it directly dates the time of sediment transportation and deposition. This method is therefore applicable to a number of archaeological and geomorphic processes which may not be dated by traditional methods, owing to the lack of organic matter suitable for radiocarbon dating. In geomorphic contexts, optical dating may be preferred over radiocarbon as it directly dates the time of sedimentation rather than the age of organic matter in features such as buried soils that may be significantly different from the geomorphic event which fossilized the soil.

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THE ORIGIN OF BANDS IN SANDY SOILS OF THE STONY PLAIN AREA

Canadian Journal of Soil Science ◽

10.4141/cjss66-039 ◽

1966 ◽

Vol 46 (3) ◽

pp. 245-254 ◽

Cited By ~ 8

Author(s):

G. M. Coen ◽

S. Pawluk ◽

W. Odynsky

Keyword(s):

Organic Matter ◽

Sandy Soils ◽

Total Thickness ◽

Free Iron ◽

Parent Materials ◽

Plain Area ◽

Mineralogical Characteristics ◽

Bt Horizon

The presence of bands in the lower sola has presented difficulties in the classification of soils developed from pitted deltaic sandy parent materials west of Edmonton, Alberta. The bands were shown to contain more organic matter, free iron, and clay than the interbands, which resulted in a darker, redder color and finer texture as observed in the field. The bands were often coincidental with stratified layers, but their occasional transgression across geologic stratification and their development in profiles without stratification suggested a pedogenic origin. Micropedological investigations revealed oriented clay around the sand grains in the bands and not the interbands, further indicating that the increase in clay was due, at least in part, to illuviation.The bands in the soils investigated have sufficient total thickness of clay accumulation to meet the requirements for a Bt horizon and together with their chemical, physical, and mineralogical characteristics permit their inclusion in the Eluviated Dark Grey Subgroup of the Chernozemic Order and the Orthic Dark Grey Wooded Subgroup of the Podzolic Order.

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Particle-size and organic matter effects on structure and water retention of soils

Biologia ◽

10.1515/biolog-2015-0176 ◽

2015 ◽

Vol 70 (11) ◽

Cited By ~ 5

Author(s):

Kálmán Rajkai ◽

Brigitta Tóth ◽

Gyöngyi Barna ◽

Hilda Hernádi ◽

Mihály Kocsis ◽

...

Keyword(s):

Land Use ◽

Organic Matter ◽

Pore Size Distribution ◽

Pore Size ◽

Size Distribution ◽

Soil Structure ◽

Water Retention ◽

Sandy Soils ◽

Soil Profiles ◽

Matter Effects

AbstractWater storage and flow in soils are highly dependent on soil structure, which strongly determines soil porosity. However pore size distribution can be derived from soil water retention curve (SWRC). Structural characteristics of cultivated arable fields (693 soil profiles, 1773 samples) and soils covered by treated forest stands (137 soil profiles, 405 samples) were selected from the MARTHA Hungarian soil physical database, and evaluated for expressing organic matter effects on soil structure and water retention. For this purpose the normalized pore size distribution curves were determined for the selected soils, plus the modal suction (MS) corresponding to the most frequent pore size class of the soil. Skewness of soils’ pore size distribution curves are found different. The quasi-normal distribution of sandy soils are transformed into distorted in clayey soils. A general growing trend of MS with the ever finer soil texture was shown. Sandy soils have the lowest average MS values, i.e. the highest most frequent equivalent pore diameter. Silty clay and clay soil textures are characterized by the highest MS values. A slight effect of land use and organic matter content is also observable in different MS values of soils under forest vegetation (’forest’) and cultivated arable land (‘plough fields’). MS values of the two land uses were compared statistically. The results of the analyses show that certain soil group’s MS are significantly different under forest vegetation and cultivation. However this difference can be explained only partly and indirectly by the organic matter of different plant coverage in the land use types.

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