Saturate hydraulic conductivity, water stable aggregates and soil organic matter in a sandy-loam soil in Ikwuano lga of Abia state

Agro-Science ◽  
2007 ◽  
Vol 4 (1) ◽  
Author(s):  
R C Eneje ◽  
C V Ogbenna ◽  
B O Nuga
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Hydraulic Conductivity ◽  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Water Stable Aggregates ◽  
Conductivity Water ◽  
Loam Soil

scholarly journals Changes in soil organic matter over 70 years in continuous arable and ley-arable rotations on a sandy loam soil in England

2017 ◽  
Vol 68 (3) ◽  
pp. 305-316 ◽  
Author(s):  
A. E. Johnston ◽  
P. R. Poulton ◽  
K. Coleman ◽  
A. J. Macdonald ◽  
R. P. White
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Loam Soil

scholarly journals Source shape and data analysis procedure effects on hydraulic conductivity of a sandy-loam soil determined by ponding infiltration runs

2017 ◽  
Vol 48 (2) ◽  
pp. 71 ◽  
Author(s):  
Vincenzo Bagarello ◽  
Andrea De Santis ◽  
Giuseppe Giordano ◽  
Massimo Iovino
Keyword(s):  
Steady State ◽  
Hydraulic Conductivity ◽  
Sandy Loam ◽  
Analysis Procedure ◽  
Sandy Loam Soil ◽  
Second Phase ◽  
General Validity ◽  
Equivalent Radius ◽  
Loam Soil ◽  
Ks Values

Performing ponding infiltration runs with non-circular sources could represent a good means to sample completely an area of interest. Regardless of the shape of the source, predicting the expected reliability of the collected data by infiltrometers should facilitate soil hydraulic characterisation and also allow a more conscious use of the field data. The influence of the shape of the infiltration source (i.e., circular or square) and the analysis procedure of the steady-state infiltration data on the saturated hydraulic conductivity, Ks, of a sandy-loam soil was tested in this investigation. Circular and square surfaces sampled with the pressure infiltrometer (PI) yielded similar estimates of Ks (i.e., differing by a factor of 1.05-1.16, depending on the calculation method) when an equivalent radius was considered to geometrically describe the square source. With the simplified falling head (SFH) technique, the shape of the source was irrelevant (i.e., circular and square sources yielding Ks values that differed by a factor of 1.19), as theoretically expected. For the steady-state PI experiment, the twoponding depth approach yielded two times smaller Ks values than the one-ponding depth (OPD) approach, probably due to lower steady-state flow rates than those expected for the second phase of the two-level run. The conclusions were that: i) simple infiltrometer experiments (PI, SFH) can be carried out with square sources; and ii) the simplest PI run (OPD approach) is expected to yield the most reliable predictions of Ks. Sampling other soils is advisable in an attempt to make these conclusions of general validity.

Adsorption of Buthidazole, VEL 3510, Tebuthiuron, and Fluridone by Organic Matter, Montmorillonite Clay, Exchange Resins, and a Sandy Loam Soil

Weed Science ◽  
1980 ◽  
Vol 28 (5) ◽  
pp. 478-483 ◽  
Author(s):  
J. B. Weber
Keyword(s):  
Organic Matter ◽  
Exchange Resin ◽  
Sandy Loam ◽  
Cation Exchange Resin ◽  
Sandy Loam Soil ◽  
Anionic Species ◽  
Loam Soil ◽  
Cape Fear ◽  
Decreasing Ph ◽  
Exchange Resins

Adsorption isotherms were obtained for buthidazole {3-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-4-hydroxy-1-methyl-2-imidazolidinone}, VEL 3510 {1-β,β-dimethoxy-1-methyl-3-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]urea}, tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea}, and fluridone {1-methyl-3-phenyl-5-[3-(trifluoromethyl)phenyl]-4 (1H)-pyridinone} on soil organic matter (H- and Ca-saturated), Ca-montmorillonite, and Cape Fear sandy loam soil. Prometryn [2,4-bis(isopropylamino)-6-(methylthio)-s-triazine] was included as a reference. The order of adsorption on all adsorbents was fluridone ≥ prometryn > > tebuthiuron ≥ VEL 3510 > buthidazole. Fluridone adsorption on the various adsorbents was: H-organic matter > Ca-montmorillonite > Ca-organic matter > > Cape Fear sandy loam. Tebuthiuron, VEL 3510, and buthidazole adsorption on the various adsorbents was in the order: H-organic matter > Ca-organic matter = Ca-montmorillonite > Cape Fear sandy loam. Adsorption of all herbicides increased with decreasing pH, suggesting that the adsorption mechanism was molecular under neutral pH conditions and ionic under acidic conditions. All of the herbicides were adsorbed in high amounts as protonated species on IR-120-H cation exchange resin and in low amounts as molecular species on IR-400-Cl anion exchange resin. Buthidazole and VEL 3510 were adsorbed in high amounts as anionic species by the IR-400-Cl exchange resin at high pH levels.

scholarly journals Comparative Study of Soil Tillage Practices Effects on Hydraulic Conductivity and Bulk Density of a Sandy Loam Soil in Tunisia

2019 ◽  
Vol 3 (1) ◽  
pp. ep19013
Author(s):  
Roua Amami ◽  
Khaled Ibrahimi ◽  
Khaoula Abrougui ◽  
Amira Hmila ◽  
Sayed Chehaibi
Keyword(s):  
Hydraulic Conductivity ◽  
Comparative Study ◽  
Bulk Density ◽  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Soil Tillage ◽  
Tillage Practices ◽  
Loam Soil
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