Search Results - "Johnston, A.E."

Potassium fertilization: paradox or K management dilemma? by Bar-Yosef, B., Magen, H., Johnston, A.E., Kirkby, E.A.

“…In 2014, Khan et al. presented evidence that soil exchangeable K (Exch-K) increases over time without addition of potassium (K) to the soil despite the removal…”
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Effectiveness of different precipitated phosphates as phosphorus sources for plants by Johnston, A.E, Richards, I.R

“…Eleven precipitated phosphates were evaluated as sources of phosphorus (P) for plant growth by comparing their effectiveness with that of monocalcium…”
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Reductions and changing patterns of ambient PCDD/Fs in the UK: Evidence and implications by Hassanin, Ashraf, Lee, Robert G.M., Johnston, A.E., Jones, Kevin C.

“…Archived herbage samples taken between the mid-1800s and the present day from the Park Grass permanent grassland experiment in the UK were analysed for…”
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Increases in the polychlorinated dibenzo-p-dioxin and -furan content of soils and vegetation since the 1840s by Kjeller, Lars Owe, Jones, Kevin C, Johnston, A. E, Rappe, Christoffer

“…Temporal trends in the polychlorinated dibenzo-p-dioxin (PCDD) and -furan (PCDF) content of soils and herbage collected from the same semirural UK plot between…”
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Changes in the polynuclear aromatic hydrocarbon content of wheat grain and pasture grassland over the last century from one site in the U.K by Jones, K C, Grimmer, G, Jacob, J, Johnston, A E

“…Crops harvested and stored from two long-term agricultural experiments started in the 1840-1850s at Rothamsted Experimental Station (U.K.) have been analyzed…”
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Effectiveness of different precipitated phosphates as phosphorus sources for plants by Johnston, A.E., Richards, I.R.

“… Eleven precipitated phosphates were evaluated as sources of phosphorus (P) for plant growth by comparing their effectiveness with that of monocalcium…”
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Significance of atmospheric inputs of lead to grassland at one site in the United Kingdom since 1860 by Jones, K. C, Johnston, A. E

“…Herbage receives Pb from the soil and the atmosphere. Studies on long-term experimental plots established at Rothamsted Experimental Station (southeast…”
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Comments on “Synthetic Nitrogen Fertilizers Deplete Soil Nitrogen: A Global Dilemma for Sustainable Cereal Production,” by R.L. Mulvaney, S.A. Khan, and T.R. Ellsworth in the Journal of Environmental Quality 2009 38:2295–2314 by Powlson, D.S., Jenkinson, D.S., Johnston, A.E., Poulton, P.R., Glendining, M. J., Goulding, K.W.T.

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Sepiapterin Improves Vascular Reactivity and Insulin-Stimulated Glucose in Wistar Rats by Reusch, Jane E. B., Johnston, Aspen, Hull, S. E., Scalzo, Rebecca L., Knaub, Leslie A., Keller, Amy C., Walker, Lori A.

“…In the vasculature, sedentary behavior leads to endothelial abnormalities, resulting in elevated cardiovascular disease risk. Endothelial nitric oxide synthase…”
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Movement of water and the herbicides atrazine and isoproturon through a large structured clay soil core by Beck, Angus J., Lam, Venessa, Edward Henderson, D., Beven, Keith J., Harris, Graham L., Roger Howse, K., “Johnny” Johnston, A.E., Jones, Kevin C.

“…A large (1.1 m × 0.8 m in diameter) core of strongly cracked clay soil was instrumented with eight suction samplers, ten zero-suction samplers and sixteen…”
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Changes in soil phosphorus fractions following positive and negative phosphorus balances for long periods by Blake, L., Johnston, A.E., Poulton, P.R., Goulding, K.W.T.

“…The effect of phosphorus (P) balance (addition, in both fertilizers and farmyard manure (FYM), minus removal in crops) on eight soil P fractions determined by…”
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Reply to Additional Comments on “Synthetic Nitrogen Fertilizers Deplete Soil Nitrogen: A Global Dilemma for Sustainable Cereal Production,” by R.L. Mulvaney, S.A. Khan, and T.R. Ellsworth in the Journal of Environmental Quality 2009 38:2295–2314 by Powlson, D.S., Jenkinson, D.S., Johnston, A.E., Poulton, P.R., Glendining, M. J., Goulding, K.W.T.

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Turnover of nitrogen-15-labeled fertilizer in old grassland by Jenkinson, D.S, Poulton, P.R, Johnston, A.E, Powlson, D.S

“…In this paper we follow the fate of single applications of 15N-labeled fertilizer to old grassland, over a period of nearly 20 yr. In 1980 and 1981,…”
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Biological weed control via nutrient competition: potassium limitation of dandelions by Tilman, Elizabeth A., Tilman, David, Crawley, Michael J., Johnston, A. E.

“…Weedy plants are often controlled by the application of herbicides. Here we explore an alternative method of control. We suggest that the abundance of an…”
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Bryophyte Biomass and Species Richness on the Park Grass Experiment, Rothamsted, UK by Virtanen, R., Johnston, A. E., Crawley, M. J., Edwards, G. R.

“…The relationships between bryophyte biomass and species richness and soil pH, nutrient applications and vascular plant biomass and species richness were…”
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Isotopic Character of Lead Deposited from the Atmosphere at a Grassland Site in the United Kingdom Since 1860 by Bacon, J. R, Jones, K. C, McGrath, S. P, Johnston, A. E

“…Lead isotope analysis, using high-precision thermal ionization mass spectrometry, of herbage samples collected annually since the 1860s has revealed a steady…”
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Long-term changes in the polychlorinated biphenyl content of United Kingdom soils by Alcock, R. E, Johnston, A. E, McGrath, S. P, Berrow, M. L, Jones, Kevin C

“…Soil samples from five different long-term agricultural experiments in southern England were used to determine PCB concentrations. PCBs were most prevalent…”
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Evidence for the Presence of PCDD/Fs in the Environment Prior to 1900 and Further Studies on Their Temporal Trends by Alcock, R. E, McLachlan, M. S, Johnston, A. E, Jones, K. C

“…This paper presents evidence for the existence of PCDD/Fs in the environment prior to the widespread development of the chloroaromatics and chlorine industry,…”
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significance of the retention of atmospherically deposited cadium on plant surfaces to the cadmium content of herbage by Nicholson, F.A, Jones, K.C, Johnston, A.E

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Contamination of Environmental Samples Prepared for PCB Analysis by Alcock, Ruth E, Halsall, Crispin J, Harris, Catherine A, Johnston, A. E, Lead, Wendy A, Sanders, Gordon, Jones, Kevin C

“…Environmental samples collected or deposited prior to their industrial synthesis are analyzed in order to distinguish possible natural and anthropogenic…”
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