A5017280846- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Rheology and Fluid Dynamics Studies
- Clay minerals and soil interactions
- Agronomic Practices and Intercropping Systems
- Characterization and Applications of Magnetic Nanoparticles
- Fluid Dynamics and Heat Transfer
- Nitrogen and Sulfur Effects on Brassica
- Crop Yield and Soil Fertility
- Ruminant Nutrition and Digestive Physiology
- Groundwater and Isotope Geochemistry
- Fluid Dynamics and Thin Films
- Rangeland and Wildlife Management
- Magnetic properties of thin films
- Rice Cultivation and Yield Improvement
- Geology and Paleoclimatology Research
- Magnetic and Electromagnetic Effects
- Geomagnetism and Paleomagnetism Studies
- Heavy metals in environment
- Phosphorus and nutrient management
- Microfluidic and Bio-sensing Technologies
- Agricultural Science and Fertilization
- Turfgrass Adaptation and Management
- Membrane Separation Technologies
- Blood properties and coagulation
Imperial College London
2024
South Dakota School of Mines and Technology
2013-2023
University of Connecticut
2023
Oregon State University
2014-2017
Mississippi State University
2007-2014
Stanford University
2011-2014
The Ohio State University
2012-2013
Mississippi Delta Community College
2011-2012
Delta Air Lines (United States)
2007
Lincoln University
1952-1985
STUDIES ON SOIL ORGANIC MATTER: I. INFLUENCE OF PHOSPHORUS CONTENT PARENT MATERIALS ACCUMULATIONS CARBON, NITROGEN, SULFUR, AND IN GRASSLAND SOILS T. WALKER;A. ADAMS; Soil Science
Abstract A modified version of the phosphate fractionation procedure Chang and Jackson (1957) included determination “residual inorg. P” introduced a revised nomenclature for other fractions. Added sorbed during fluoride extraction was usually completely recovered in succeeding sodium hydroxide extraction; this enabled mutually compensating corrections to be applied NH 4 F‐P 1st NaOH‐P values. second acid treatment increased amount Ca‐P extracted. Further modifications simplified...
Summary The rate of loss total P and accumulation organic were investigated in a chronosequence weakly weathered soils developed on wind‐blown sand. net during 10 000 years soil development was 1910 kg/ha m profile. This calculation assumes constancy the content parent material. An approximately straight‐line plot obtained for between 500 years. beach sands very low but increased rapidly early stages development. With increasing time, decreased. 1050 A slow formation P, coupled with rapid...
Abstract Apatite inclusions have been identified in several primary minerals, and their abundance morphology described. A comparison of methods used for the determination total P soils showed that Na 2 CO 3 fusion is most reliable method samples which contain apatite effectiveness extraction was usually order: > HF digestion HClO 4 N H SO following ignition. Included using a petrological microscope residues after with 60% . This form also extracted much more slowly by 0.5 HCl than...
Normalized difference vegetation index (NDVI) measurements have the potential to improve mid‐season N crop management decisions in rice ( Oryza sativa L.). The objectives of this study were determine optimum sensing timing and establish a yield prediction model using NDVI acquired with GreenSeeker sensor. Weekly sensor readings collected over 5‐wk period from multi‐rate fertilization trials established at six different locations 2008 2010. Categorizing by growth stage demonstrated that late...
Summary Soil organic matter was extracted by a mixture of O.IM Na 4 P 2 O: NaOH from chronosequence weakly weathered soils developed on aeolian sand, and fractionated into humin (non‐extractable), humic acid, fulvic acid. The mass total carbon in the profiles, 14 C content 13 C/12C ratios were also determined. weight increased rapidly at first then gradually without attaining steady state. This trend shown acid fractions, but fraction appeared to have reached maximum after about 3000 years....
Summary A study was made of the amounts and distribution C, N, S, organic P accumulated over a period 10 000 years soil development on wind‐blown sand. After initial rapid rates accumulation during first 1000 years, subsequent gain were slower, but steady states for S had still not been reached after years. Sulphur declined 50 then increased in parallel fashion to C. During gains total 204 000, 9800, 1180, 1170 kg/ha m profile, respectively. Gains N older soils are readily accounted by...
The role of nanotopographical extracellular matrix (ECM) cues in vascular endothelial cell (EC) organization and function is not well-understood, despite the composition nano- to microscale fibrillar ECMs within blood vessels. Instead, predominant modulator EC traditionally thought be hemodynamic shear stress, which uniform stress induces parallel-alignment ECs with anti-inflammatory function, whereas disturbed flow a disorganized configuration pro-inflammatory function. Since acts on by...
Abstract The amounts of total P extracted by Na2CO3 fusion and HF HClO4 digestion procedures from selected New Zealand soils parent materials were compared. It is suggested that the most reliable procedure. Digestion with gave low results strongly weathered samples which contained apatite inclusions within constituent primary minerals; whereas slightly only included apatite. Incomplete extraction was ascribed to partial resistance attack host minerals. Because occlusion highly crystalline...
Summary The rate of transformation inorganic phosphorus fractions and forms was investigated in a chronosequence weakly weathered soils developed on windblown sand. net decline acid‐extractable Ca‐P during 10 4 years soil development approximately 2600 kg/ha m profile. This fraction progressively removed from surface horizons had virtually disappeared the oldest soil. Residual P, considered to be included apatite which is not extracted by 0·5 1N HC1, relatively constant profiles but...
The adhesion in 3D-printed composites between dissimilar layers was investigated response to demand for multimaterial prints. Previously, we reported on the thermal properties printability of thermoplastic polyurethane (TPU) blends~\cite{harris001}. Here, report qualitative and quantitative commonly-printed materials, acrylonitrile butadiene styrene (ABS) or acrylate (ASA), flexible TPU. ASTM D1002/D3164 lap shear tests were performed measure strength plastics TPU, finding values...
In well drained grassland soils, most of the sulphur occurs in organic matter and average C : N S ratio A horizon normal soils is probably 100 8 1. absence outside sources sulphur, grasses a grass/legume association would be almost completely dominant as they compete intensively with legumes for could utilise all mineral nitrogen made available by mineralisation matter. Legumes are thus dependent on without which will fix little nitrogen. The amount needed depend factors governing...