A5028634354- Soil Geostatistics and Mapping
- Geochemistry and Geologic Mapping
- Soil and Unsaturated Flow
- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Spatial and Panel Data Analysis
- Heavy metals in environment
- Soil Moisture and Remote Sensing
- Soil erosion and sediment transport
- Soil and Land Suitability Analysis
- Plant Micronutrient Interactions and Effects
- Selenium in Biological Systems
- Remote Sensing in Agriculture
- Mineral Processing and Grinding
- Trace Elements in Health
- Geological Modeling and Analysis
- Child Nutrition and Water Access
- Agricultural Science and Fertilization
- Economic and Environmental Valuation
- Heavy Metal Exposure and Toxicity
- Iron Metabolism and Disorders
- Crop Yield and Soil Fertility
- Rice Cultivation and Yield Improvement
- Forest ecology and management
- Water Quality and Resources Studies
University of Nottingham
2018-2025
Loughborough University
2019-2024
British Geological Survey
2012-2024
Silsoe Research Institute
1998-2013
Rothamsted Research
2005-2012
CSIRO Land and Water
2009
Cranfield University
2006-2008
The University of Sydney
2008
University of Hertfordshire
2008
Agri Food and Biosciences Institute
2008
Abstract Micronutrient deficiencies (MNDs) remain widespread among people in sub-Saharan Africa 1–5 , where access to sufficient food from plant and animal sources that is rich micronutrients (vitamins minerals) limited due socioeconomic geographical reasons 4–6 . Here we report the micronutrient composition (calcium, iron, selenium zinc) of staple cereal grains for most production areas Ethiopia Malawi. We show there geospatial variation nutritionally important at subnational scales. Soil...
Abstract Groundwater forms the basis of water supplies across much Africa and its development is rising as demand for secure increases. Recharge rates are a key component assessing groundwater potential, but have not been mapped Africa, other than from global models. Here we quantify long-term average (LTA) distributed recharge period 1970–2019 134 ground-based estimates upscaled statistically. Natural diffuse local focussed recharge, where this mechanism widespread, included discrete...
Summary Geostatistical estimates of a soil property by kriging are equivalent to the best linear unbiased predictions (BLUPs). Universal is BLUP with fixed‐effect model that some function spatial co‐ordinates, or more generally other secondary predictor variable when it called external drift. A problem in universal find variance for random variation, since empirical variograms estimated from data method‐of‐moments will be affected both variation and represented fixed effects. The...
Summary The standard estimator of the variogram is sensitive to outlying data, a few which can cause overestimation variogram. This will result in incorrect variances when estimating value soil property by kriging or designing sampling grid map required precision. Several robust estimators variogram, based on location and scale estimation, have been proposed as improvements. They seem be suitable for analysis data circumstances where likely affected outliers. Robust are assumptions about...
The revised Environmental Protection Act Part 2A contaminated land Statutory Guidance (England and Wales) makes reference to 'normal' levels of contaminants in soil. British Geological Survey has been commissioned by the United Kingdom Department for Environment, Food Rural Affairs (Defra) estimate contaminant soil define what is meant English states that are typical widespread arise from a combination both natural diffuse pollution contributions. Available systematically collected data sets...
There are numerous methods for adjusting measured concentrations of urinary biomarkers hydration variation. Few studies use objective criteria to quantify the relative performance these methods. Our aim was compare existing Creatinine, osmolality, excretion rate (ER), bodyweight adjusted ER (ERBW) and empirical analyte-specific flow (UFR) adjustment on spot lead (Pb), cadmium (Cd), non-arsenobetaine arsenic (AsIMM) iodine (I) from US National Health Nutrition Examination Survey (NHANES)...
Abstract Selenium (Se) is an essential human micronutrient. Deficiency of Se decreases the activity selenoproteins and can compromise immune thyroid function cognitive development, increase risks from non-communicable diseases. The prevalence deficiency unknown in many countries, especially sub-Saharan Africa (SSA). Here we report that risk Malawi large among a nationally representative population 2,761 people. For example, 62.5% 29.6% women reproductive age (WRA, n = 802) had plasma...
Abstract Contrasting tillage strategies not only affect the stability and formation of soil aggregates but also modify concentration thermostability organic matter associated with aggregates. Understanding carbon retention ability under different systems is essential to ascertain potential terrestrial storage. We characterized (SOC) within various aggregate size classes both zero conventional using novel Rock‐Eval pyrolysis. The nature pore was visualized quantified by X‐ray computed...
Summary Variograms of soil properties are usually obtained by estimating the variogram for distinct lag classes method‐of‐moments and fitting an appropriate model to estimates. An alternative is fit a maximum likelihood data on assumption that they realization multivariate Gaussian process. This paper compares two using both simulation real data. The were used estimate variograms simulated from stationary processes. In one example, where field was sampled at different intensities, estimation...
Summary The general linear model encompasses statistical methods such as regression and analysis of variance ( anova ) which are commonly used by soil scientists. standard ordinary least squares (OLS) method for estimating the parameters is a design‐based that requires data have been collected according to an appropriate randomized sample design. Soil often obtained systematic sampling on transects or grids, so OLS not appropriate. Parameters can be estimated from systematically sampled...
Summary A wavelet is a compact analysing kernel that can be moved over sequence of data to measure variation locally. There are several families wavelet, and within any one family wavelets different lengths therefore smoothness their corresponding scaling functions assembled into collection orthogonal functions. Such an assemblage then applied filter spatial series independent components at varying scales in single coherent analysis. The application requires no assumptions other than finite...
Abstract Analysis of data from the National Soil Inventory England and Wales obtained between 1978 2003 shows widespread increases in soil pH – i.e., soils became less acid across both countries during survey period. In general, increased under all land uses. At least part increase its regional variation could be explained by decreased sulphur deposition atmosphere. Changes liming practices on arable probably also contributed. The effect was moderated use, properties particularly organic...
Summary Diffuse reflectance spectroscopy using visible (vis), near‐infrared (NIR) and mid‐infrared (mid‐IR) energy can be a powerful tool to assess monitor soil quality function. Mathematical pre‐processing techniques multivariate calibrations are commonly used develop spectroscopic models predict properties. These contain many predictor variables that collinear redundant by nature. Partial least squares regression (PLSR) is often for their analysis. Wavelets smooth signals reduce large data...
Abstract Quantifying the extent of soil erosion at a fine spatial resolution can be time consuming and costly; however, proximal remote sensing approaches to collect topographic data present an emerging alternative for quantifying volumes lost via erosion. Herein we compare terrestrial laser scanning (TLS), both unmanned aerial vehicle (UAV) ground photography (GP) structure‐from‐motion (SfM) derived topography. We cost‐effectiveness accuracy SfM techniques TLS gully surveying in upland...