EFFETS DU SOUS-SOLAGE ET DU LABOUR PROFOND SUR LES PROPRIETES PHYSIQUES DU SOL ET LE RENDEMENT DE LA LUZERNE ET DU MAIS SUR LOAM SABLEUX CHALOUPE

1980 ◽  
Vol 60 (2) ◽  
pp. 345-353
Author(s):  
D. COTE ◽  
G. DUPUIS
Keyword(s):  
Organic Matter ◽  
Soil Texture ◽  
Crop Yields ◽  
Organic Matter Content ◽  
Fine Sand ◽  
Matter Content ◽  
Corn Silage ◽  
Propriétés Physiques ◽  
Deep Plowing ◽  
Resistance To Penetration

Following deep plowing and subsoiling treatment in 1971, alfalfa and corn silage were grown continuously during a 5-yr period on Chaloupe soils which have an indurated layer at 40 cm or deeper. These soils were formed from laminated particles of very fine sand and loam of recent sedimentary origin. Measurements taken in 1972 and 1975 included bulk density, resistance to penetration, permeability, organic matter content and soil texture. Subsoiling did not significantly change soil physical properties; only a slice of soilless than 10 cm wide at depth 50 cm and deeper on each side of and in the furrow made by the ripper showed modifications, without affecting crop yields. Deep plowing, however, in turning the soil by 120° to 150° resulted in redistribution of the organic matter and the soil texture down the profile, a diminution in resistance to penetration in the subsoil. But it did not change the porosity or the permeability of the lower layers. Physical modifications brought by deep plowing were still persistent after more than a 3-yr period. Improvement in physical and hydrodynamic soil properties following deep plowing did not have any beneficial effect on corn and alfalfa yields.

scholarly journals Diversity and distribution of crustaceans from 13 sheltered sandy beaches along São Sebastião Channel, south-eastern Brazil

2001 ◽  
Vol 81 (3) ◽  
pp. 475-484 ◽  
Author(s):  
P.R. Nucci ◽  
A. Turra ◽  
E.H. Morgado
Keyword(s):  
Organic Matter ◽  
Organic Matter Content ◽  
Clay Content ◽  
Fine Sand ◽  
Sandy Beaches ◽  
Matter Content ◽  
Sediment Grain Size ◽  
Crustacean Species ◽  
South Eastern ◽  
Eastern Brazil

The crustacean species composition in the intertidal zones of 13 sheltered unconsolidated marine beaches in south-eastern Brazil is described. Fifty-three crustacean species were collected, adding 46 species to the total reported by previous studies in the same region. Decapods dominated the community, in contrast to exposed sandy beaches where peracarids normally predominate. The species were distributed irregularly among the beaches. Richness varied markedly among sites, and was positively related to a combination of factors such as fine sand grains, high organic matter content, and relatively low silt–clay content. The presence of rock fragments enabled both rocky shore and sandy beach crustaceans to occur on the same beaches. Richness and abundance of crustaceans showed no clear relationship to sediment grain size and slope, in contrast to the norm for exposed sandy beaches. The dominance of the tanaid Kalliapseudes schubarti in some areas may be a result of organic matter pollution in the region. These beaches showed higher species richness than typical sheltered and exposed sandy beaches, indicating that this sheltered, highly heterogeneous seascape is an important area for conservation.

Influence of soil texture and mineralogy on organic matter content and composition in physically separated fractions soils of Thailand

Geoderma ◽  
2013 ◽  
Vol 195-196 ◽  
pp. 207-219 ◽  
Author(s):  
Wittaya Jindaluang ◽  
Irb Kheoruenromne ◽  
Anchalee Suddhiprakarn ◽  
Bhupinder Pal Singh ◽  
Balwant Singh
Keyword(s):  
Organic Matter ◽  
Soil Texture ◽  
Organic Matter Content ◽  
Matter Content

Plastic limits of agricultural soils as functions of soil texture and organic matter content

Soil Research ◽  
2012 ◽  
Vol 50 (1) ◽  
pp. 7 ◽  
Author(s):  
Thomas Keller ◽  
Anthony R. Dexter
Keyword(s):  
Organic Matter ◽  
Soil Texture ◽  
Agricultural Soils ◽  
Organic Matter Content ◽  
Clay Content ◽  
Liquid Limit ◽  
Matter Content ◽  
Pedotransfer Functions ◽  
Strongly Correlated ◽  
Yield Information

The plastic limits (lower plastic limit, PL; and liquid limit, LL) are important soil properties that can yield information on soil mechanical behaviour. The objective of this paper is to study the plastic limits of agricultural soils as functions of soil texture and organic matter (OM) content. The plastic limits were highly related to the clay content. The LL was more strongly correlated with clay than was PL, but the reasons are unclear. Interestingly, PL was virtually unaffected by clay content for soils with clay contents below ~35%. The OM had a strong effect on the plastic limits. This effect was clearly demonstrated when analysing soils of similar texture with a range of OM. We present equations (pedotransfer functions) for estimation of PL, LL, and plasticity index (PI) from soil texture and OM. Finally, we predict that the clay content must be ≥10% for soils without OM to be plastic; however, soils with <10% clay can be plastic if OM is present. More research is needed to investigate OM effects on soil consistency.

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 Superficial sediments and their relation to polyehaete families in a subtropieal embayment, Mexico

2015 ◽  
pp. 237-238
Author(s):  
Nuria Méndez ◽  
María Green Ruiz
Keyword(s):  
Grain Size ◽  
Organic Matter ◽  
Organic Matter Content ◽  
Fine Sand ◽  
Matter Content ◽  
Pearson’S Correlation ◽  
Pearson's Correlation ◽  
Superficial Sediments ◽  
Soft Bottoms

The soft bottoms in front of Mazatlan Bay and "Isla de la Piedra" Peninsula were studied to produce maps (depth, grain size and organic matter content in sediments). Sixty samples were óbtained with a 30 x 30 van Veen grab (4-21 m depth) and polychaetes were extracted from 21 subsamples. Grain size ranged from -1.05 phi (gravel) to 3 .81 phi (very fine sand), with fme sand predominl\ting. Organic matter content in sediment was 0.91-3.06 % (most values = 1-2 %). Thirty polychaete families (905 individuals/m2 in mean) were found, and Cirratulidae, Spionidae, Onuphidae, and Pilargiidae were domiuant. Pearson's correlation of grain size.

scholarly journals Deficiency of Boron and its management in soil and plants

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Rooma Das ◽  
Devroop Das ◽  
Renu Singh ◽  
Shrila Das ◽  
Sunanda Vishvas ◽  
...  
Keyword(s):  
Organic Matter ◽  
Crop Yield ◽  
Soil Texture ◽  
Growth And Development ◽  
Organic Matter Content ◽  
Normal Growth ◽  
Matter Content ◽  
Boron Deficiency ◽  
Fertilizer Recommendation ◽  
North Eastern

Boron is an essential micronutrient for normal growth and development of plants. Deficiency of B in plants produces several visual symptoms and affects the crop yield. Uptake of B by plants is closely related to the availability of B in soils which is ultimately controlled by many soil properties like soil texture, organic matter content, pH, presence of Fe and Al oxides etc. Boron deficiency in soils is very common in eastern and north-eastern parts of India. The management of B in soils is very important for correcting B deficiency in plants. All the soil and plant parameters must be considered for precise fertilizer recommendation of B, as the range of B deficiency and its toxicity is very narrow in soil and plants.

scholarly journals Trace elements in Finnish soils as related to soil texture and organic matter content

1962 ◽  
Vol 34 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Mikko Sillanpää
Keyword(s):  
Trace Elements ◽  
Organic Matter ◽  
Soil Texture ◽  
Organic Matter Content ◽  
Matter Content ◽  
Relative Resistance ◽  
Soil Material ◽  
Geological Origin ◽  
Trace Element Contents ◽  
Mineral Soils

A study was conducted to evaluate the relation of the total contents of Co, Cu, Mn, Ni, Pb and Zn on soil texture and organic matter content. In spite of a wide variation, a clear tendency for the trace element contents (Pb being an exception) to decrease with increasing particle size was found. The reason for this is believed to be associated with the geological origin of the soil material and with the relative resistance to weathering of the minerals from which the trace elements are derived. In mineral soils the contents of trace elements increased with increasing organic matter and the maximum contents are likely to be found in soils containing from 5 to 15 per cent organic matter. A further increase in organic matter tends to decrease the total contents of trace elements expressed on a volume basis (kg/ha). The causes underlying this relation, which are believed to be pedological rather than chemical, are discussed.

Evaluation of some selected soil properties of a drip irrigated tomato field at different moisture regimes in South-Western Nigeria

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
E.O. Ogundipe
Keyword(s):  
Organic Matter ◽  
Hydraulic Conductivity ◽  
Soil Properties ◽  
Bulk Density ◽  
Soil Texture ◽  
Organic Matter Content ◽  
Infiltration Rate ◽  
Matter Content ◽  
Saturated Hydraulic Conductivity ◽  
Tomato Field

Soil properties are important to the development of agricultural crops. This study determined some selected soil properties of a drip irrigated tomato (Lycopersicon esculentum M.) field at different moisture regime in South-Western Nigeria. The experiment was carried out using Randomized Complete Block Design with frequency and depth of irrigation application as the main plot and sub-plot, respectively in three replicates. Three frequencies (7, 5 and 3 days) and three depths equivalent to 100, 75 and 50% of water requirement were used. Undisturbed and disturbed soil samples were collected from 0-5, 5-10, 10-20 and 20-30 cm soil layers for the determination of some soil properties (soil texture, organic matter content, bulk density, infiltration rate and saturated hydraulic conductivity) were determined using standard formulae. Soil Water Content (SWC) monitoring was conducted every two days using a gravimetric technique. The soil texture was sandy loam for all the soil depths; average value of soil organic matter was highest (1.8%) in the 0-5 cm surface layer and decreased with soil depth; the soil bulk density value before and after irrigation experiment ranged from 1.48 and 1.73 g/cm3 and 1.5 and 1.76 g/cm3, respectively; there was a rapid reduction in the initial infiltration and final infiltration rate. Saturated hydraulic conductivity show similar trend although the 20-30 cm layer had the lowest value (50.84 mm/h); the SWC affect bulk density during the growing season. The study showed that soil properties especially bulk density and organic matter content affect irrigation water movement at different depth..

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