David Powlson - papers in refereed journals
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Soil Sci. Soc. Am. J. 72:775–785 doi:10.2136/sssaj2006.0378
Soil organic C (SOC) pools under long-term management practices provide information on C sequestration pathways, soil quality maintenance, and crop productivity. Farmyard manure (FYM), paddy straw (PS), and green manure (GM) along with inorganic fertilizers were used in a 19-yr-old rice (Oryza sativa L.)-wheat (Triticum aestivum L.) cropping system in subtropical India to evaluate their impact on SOC stock, its different pools-total organic C (C tot ); oxidizable organic C (C oc ) and its four fractions of very labile (C frac1 ), labile (C frac2 ), less labile (C frac3 ), and nonlabile C (C frac4 ); microbial biomass C (C mic ); and mineralizable C (C min ). Cropping with only N-P-K fertilization just maintained SOC content, while N-P-K plus organics increased SOC by 24.3% over the control, their relative effi cacy being FYM > PS > GM. A minimum of 3.56 Mg C ha −1 yr −1 was required to be added as organic amendments to compensate for SOC loss from cropping. The passive (C frac3 + C frac4 ) pool and C min constituted about 39 and 11.5%, respectively, of C tot . Organics contributed toward the passive pool in the order FYM > PS > GM. Most of the pools were signifi cantly (P = 0.005) correlated with each other. Yield and sustainable yield index were strongly related with C frac1 , C oc , C mic , and C min . Results suggest C frac1 as a useful indicator for assessing soil health, and balanced fertilization with FYM as suitable management for sustaining crop productivity of the rice-wheat system.
Soil biology and Biochemistry 1
Conservation tillage practices are widely used to protect against soil erosion and soil C losses, whereas winter cover crops are used mainly to protect against N losses during autumn and winter. For the greenhouse gas balance of a cropping system the effect of reduced tillage and cover crops on N 2 O emissions may be more important than the effect on soil C. This study monitored emissions of N 2 O between September 2008 and May 2009 in three tillage treatments, i.e., conventional tillage (CT), reduced tillage (RT) and direct drilling (DD), all with (þCC) or without (ÀCC) fodder radish as a winter cover crop. Cover crop growth, soil mineral N dynamics, and other soil characteristics were recorded. Furthermore, soil concentrations of N 2 O were determined eight times during the monitoring period using permanently installed needles. There was little evidence for effects of the cover crop on soil mineral N. Following spring tillage and slurry application soil mineral N was dominated by the input from slurry. Nitrous oxide emissions during autumn, winter and early spring remained low, although higher emissions from þCC treatments were indicated after freezing events. Following spring tillage and slurry application by direct injection N 2 O emissions were stimulated in all tillage treatments, reaching 250e400 mg N m À2 h À1 except in the CT þ CC treatment, where emissions peaked at 900 mg N m À2 h À1 . Accumulated emissions ranged from 1.6 to 3.9 kg N 2 O ha À1 . A strong positive interaction between cover crop and tillage was observed. Soil concentration profiles of N 2 O showed a significant accumulation of N 2 O in CT relative to RT and DD treatments after spring tillage and slurry application, and a positive interaction between slurry and cover crop residues. A comparison in early May of N 2 O emissions with flux estimates based on soil concentration profiles indicated that much of the N 2 O emitted was produced near the soil surface.
Appllied soil ecology 2004
Studying land degradation through a soil quality approach, which reveals soil functioning within the ecosystem, is necessary for sustainable management of land resources. This investigation was conducted to understand the changes of soil functions, resulting from exploitive management, using some soil quality indicators and their statistical and geostatistical measures. Undisturbed and disturbed sites were identified in each of two study areas, including an oak forest and a semiarid rangeland in central Iran. Soil organic carbon (OC), total nitrogen (TN), microbial respiration (MR), aggregate stability (AS), and hydraulic properties of the sites were determined. Statistical comparisons of frequency distribution functions of OC and MR revealed that these functions are normal in protected forest, while in the disturbed forest distributions deviate from normality. In the rangeland sites, the results were exactly the opposite. Spatial variability of the two variables in forest sites demonstrated pure nugget and spherical pattern in protected and disturbed sites, respectively. As for the rangeland ecosystem, pure nugget pattern was observed for both sites. According to our findings, protection of rangeland has resulted in higher OC and MR with no effect on the amount of TN and infiltration rate. The negative effect of this management system was a decrease in aggregate stability due to the formation of crust as a result of complete grazing exclusion. By contrast, improvement in all soil quality indicators in protected forest indicated the success of conservative management in this region.
Journal of Soil Science and Environmental Management
2016
Humic substances are extremely important attributes of soil quality but the impacts of long-term fertilization on their composition and structure remain controversial and are still not fully understood. A study, employing various methods was conducted to elucidate the influence of long-term fertilization practices on the composition and structure of humic substances. Soil samples were collected from eight treatments at the Red Soil Experimental Station of the Chinese Academy of Agricultural Sciences. Data were subjected to analysis of variance (ANOVA), using the MSTAT-C software package. In general, the Fourier transform-infrared (FT-IR) spectra discriminated bands between humic fractions. The humic acid (HA) from the NPK plus manure (NPKM) and manure alone (M) treatments showed higher values of the O/R ratios (1.24 and 1.18, respectively) as compared to that from the 1.5 NPKM and fallow (H) treatments, which decreased these ratios (0.66 and 0.85, respectively). Except for NPKM plus wheatsoybean-sweet potato between the lines (NPKMR), the O/R ratios of the fulvic acid (FA) did not differ among the treatments. However, the humin (HM) from H and the control (CK) displayed the highest value of O/R ratios (about 3.23 for both). Humic substances from organic treatments showed more aliphatic nature, whereas more condensed-alkali soluble humic substances were formed in the unfertilized and mineral treatments. Among fractions, the HA formed more phenolic or aromatic structures than did the FA or HM. In addition, the C, H, N and S contents of humic substances increased significantly, whereas their oxygen content decreased.
Journal of Soil Science and Environmental Management 2(11), 370-374
Disturbed and undisturbed soil samples from three land use types namely cultivated land (CL), grazing land (GL) and fallow land (FL) at a depth of 15-30cm were collected and analyzed using standard laboratories for soil nutrients and soil physical properties. Results show open grazing lands (CEC 19.59 meq/100g) to be more fertile than cultivated (13.88 meq/100g) and fallow (6.40 meq/100g) lands. This was attributed to the continuous dropping of faecal material by grazing livestock. Higher bulk density in grazing land (1.36 g/cm 3 ) compared to cultivated and fallow lands with 1.29 g/cm 3 and 1.33 g/cm 3 was attributed to the hoof action of livestock. These results suggest that different land use types in the semi-arid rangelands contribute immensely to soil properties.
67. GUPTA S.R., NEELAM and RAVI KUMAR. 2009 Soil Ecology, Biodiversity and carbon mangement. International Journal of Ecology and Environmental Sciences 35: 129-161
This paper gives an overview of soil ecosystem services, soil organic matter dynamics, models of soil organic matter, biotic and abiotic control of litter decomposition, patterns of soil biodiversity, and potential of soil carbon sequestration to mitigate climate change. Healthy soil provides a wide range of ecosystem goods and services and the value of the ecosystem services provided by soil biodiversity amounts to US $1.5 trillion per year. Soil texture, soil mineralogy and soil organic matter play an important role in the functioning of an ecosystem. The global carbon pools and fluxes, and soil and vegetation carbon pools at biome and regional level have been discussed. The organic matter inputs and soil carbon pools vary in different biomes and ecosystems. Soil organic carbon simulation models are being increasingly used to describe soil carbon dynamics. Climate, soil fauna and litter quality regulate the rates of litter decomposition at local, regional and global scale. Litter quality has emerged as the most important direct regulator of the rates and patterns of litter decomposition at the global scale. There is much interest to analyze the effect of litter diversity, climate change and invasive species on litter decomposition rates. Modern techniques of molecular biology and high resolution microscopy elucidate the structural and functional aspects of soil biodiversity. Sustainable management and conservation of soil biota is important for conserving global biodiversity, as soil communities are species rich and affect ecosystem processes. Conservation agriculture, tree plantations on degraded lands, and agroforestry could enhance carbon storage in the soil-plant system. The integration of science, technology and traditional ecological knowledge can make substantial contribution to the science of soil ecology, ecosystem carbon management, and sustainability.
Soil ecology
Latest trends in soilsciences, 2021
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David Powlson – papers in refereed journals
D.D. Richter, M. Hofmockel, M.A. Callaham, D.S. Powlson & P. Smith. 2007. Longterm soil experiments: Keys to managing Earth's rapidly changing ecosystems. Soil
Science Society of America Journal, 71, 266-279.
E. Milne, D.S. Powlson & C.E. Cerri. 2007. Soil carbon stocks at regional scales.
Agriculture Ecosystems & Environment, 122, 1-2.
E. Milne, K. Paustian, M. Easter, M. Sessay, R. Al-Adamat, N.H. Batjes, M. Bernoux, T.
Bhattacharyya, C.C. Cerri, C.E.P. Cerri, K. Coleman, P. Falloon, C. Feller, P. Gicheru,
P. Kamoni, K. Killian, D.K. Pal, D.S. Powlson, S. Williams & Z. Rawajfih. 2007. An
increased understanding of soil organic carbon stocks and changes in non-temperate
areas: National and global implications. Agriculture Ecosystems & Environment, 122,
125-136.
E. Milne, R. Al Adamat, N.H. Batjes, M. Bernoux, T. Bhattacharyya, C.C. Cerri, C.E.P.
Cerri, K. Coleman, M. Easter, P. Falloon, C. Feller, P. Gicheru, P. Kamoni, K. Killian,
D.K. Pal, K. Paustian, D.S. Powlson, Z. Rawajfih, M. Sessay, S. Williams & S. Wokabi.
2007. National and sub-national assessments of soil organic carbon stocks and
changes: The GEFSOC modelling system. Agriculture Ecosystems & Environment, 122,
3-12.
M. Easter, K. Paustian, K. Killian, S. Williams, T. Feng, R. Al-Adamat, N.H. Batjes, M.
Bernoux, T. Bhattacharyya, C.C. Cerri, C.E.P. Cerri, K. Coleman, P. Falloon, C. Feller,
P. Gicheru, P. Kamoni, E. Milne, D.K. Pal, D.S. Powlson, Z. Rawajfih, M. Sessay & S.
Wokabi. 2007. The GEFSOC soil carbon modelling system: A tool for conducting
regional-scale soil carbon inventories and assessing the impacts of land use change on
soil carbon. Agriculture Ecosystems & Environment, 122, 13-25.
C.E.P. Cerri, M. Easter, K. Paustian, K. Killian, K. Coleman, M. Bernoux, P. Falloon,
D.S. Powlson, N.H. Batjes, E. Milne & C.C. Cerri. 2007. Predicted soil organic carbon
stocks and changes in the Brazilian Amazon between 2000 and 2030. Agriculture
Ecosystems & Environment, 122, 58-72.
C.E.P. Cerri, M. Easter, K. Paustian, K. Killian, K. Coleman, M. Bernoux, P. Falloon,
D.S. Powlson, N. Batjes, E. Milne & C.C. Cerri. 2007. Simulating SOC changes in 11
land use change chronosequences from the Brazilian Amazon with RothC and Century
models. Agriculture Ecosystems & Environment, 122, 46-57.
T. Bhattacharyya, D.K. Pal, M. Easter, N.H. Batjes, E. Milne, K.S. Gajbhiye, P.
Chandran, S.K. Ray, C. Mandal, K. Paustian, S. Williams, K. Killian, K. Coleman, P.
Falloon & D.S. Powlson. 2007. Modelled Soil Organic Carbon stocks and changes in
the Indo-Gangetic Plains, India from 1980 to 2030. Agriculture Ecosystems &
Environment, 122, 84-94.
R. Al-Adamat, Z. Rawajfih, M. Easter, K. Paustian, K. Coleman, E. Milne, P. Falloon,
D.S. Powlson & N.H. Batjes. 2007. Predicted soil organic carbon stocks and changes
in Jordan between 2000 and 2030 made using the GEFSOC modelling system.
Agriculture Ecosystems & Environment, 122, 35-45.
C.W. Watts, L.J. Clark, P.R. Poulton, D.S. Powlson & A.P. Whitmore. 2006. The role of
clay, organic carbon and long-term management on mouldboard plough draught
measured on the Broadbalk wheat experiment at Rothamsted. Soil Use and
Management, 22, 334-341.
S.P. Sohi, N. Mahieu, D.S. Powlson, B. Madari, R.H. Smittenberg & J.L. Gaunt. 2005.
Investigating the chemical characteristics of soil organic matter fractions suitable for
modeling. Soil Science Society of America Journal, 69, 1248-1255.
D.S. Powlson, A.B. Riche & I. Shield. 2005. Biofuels and other approaches for
decreasing fossil fuel emissions from agriculture. Annals of Applied Biology, 146, 193201.
N. Poirier, S.P. Sohi, J.L. Gaunt, N. Mahieu, E.W. Randall, D.S. Powlson & R.P.
Evershed. 2005. The chemical composition of measurable soil organic matter pools.
Organic Geochemistry, 36, 1174-1189.
A.J. Macdonald, P.R. Poulton, M.T. Howe, K.W.T. Goulding & D.S. Powlson. 2005. The
use of cover crops in cereal-based cropping systems to control nitrate leaching in SE
England. Plant and Soil, 273, 355-373.
D.S. Jenkinson, P.R. Poulton, A.E. Johnston & D.S. Powlson. 2004. Turnover of
nitrogen-15-labeled fertilizer in old grassland. Soil Science Society of America Journal,
68, 865-875.
D.S. Jenkinson, P.C. Brookes & D.S. Powlson. 2004. Measuring soil microbial
biomass. Soil Biology & Biochemistry, 36, 5-7.
A.J. Macdonald, P.R. Poulton, E.A. Stockdale, D.S. Powlson & D.S. Jenkinson. 2002.
The fate of residual N-15-labelled fertilizer in arable soils: its availability to subsequent
crops and retention in soil. Plant and Soil, 246, 123-137.
S.P. Sohi, N. Mahieu, J.R.M. Arah, D.S. Powlson, B. Madari & J.L. Gaunt. 2001. A
procedure for isolating soil organic matter fractions suitable for modeling. Soil Science
Society of America Journal, 65, 1121-1128.
P. Smith, K.W. Goulding, K.A. Smith, D.S. Powlson, J.U. Smith, P. Falloon & K.
Coleman. 2001. Enhancing the carbon sink in European agricultural soils: including
trace gas fluxes in estimates of carbon mitigation potential. Nutrient Cycling in
Agroecosystems, 60, 237-252.
D.S. Powlson, P.R. Hirsch & P.C. Brookes. 2001. The role of soil microorganisms in
soil organic matter conservation in the tropics. Nutrient Cycling in Agroecosystems, 61,
41-51.
M.J. Glendining, P.R. Poulton, D.S. Powlson, A.J. Macdonald & D.S. Jenkinson. 2001.
Availability of the residual nitrogen from a single application of N-15-labelled fertilizer to
subsequent crops in a long-term continuous barley experiment. Plant and Soil, 233,
231-239.
P. Smith, D.S. Powlson, J.U. Smith, P. Falloon & K. Coleman. 2000. Meeting the UK's
climate change commitments: options for carbon mitigation on agricultural land. Soil
Use and Management, 16, 1-11.
P. Smith, D.S. Powlson, J.U. Smith, P. Falloon & K. Coleman. 2000. Meeting Europe's
climate change commitments: quantitative estimates of the potential for carbon
mitigation by agriculture. Global Change Biology, 6, 525-539.
P. Smith & D.S. Powlson. 2000. Considering manure and carbon sequestration.
Science, 287, 428-429.
P. Smith, R. Milne, D.S. Powlson, J.U. Smith, P. Falloon & K. Coleman. 2000. Revised
estimates of the carbon mitigation potential of UK agricultural land. Soil Use and
Management, 16, 293-295.
P. Smith, K.W.T. Goulding, K.A. Smith, D.S. Powlson, J.U. Smith, P. Falloon & K.
Coleman. 2000. Including trace gas fluxes in estimates of the carbon mitigation potential
of UK agricultural land. Soil Use and Management, 16, 251-259.
D.S. Powlson. 2000. Tackling nitrate from agriculture. Soil Use and Management, 16,
141-141.
L. Dendooven, E. Murphy & D.S. Powlson. 2000. Failure to simulate C and N
mineralization in soil using biomass C-to-N ratios as measured by the fumigation
extraction method? Soil Biology & Biochemistry, 32, 659-668.
L. Blake, S. Mercik, M. Koerschens, S. Moskal, P.R. Poulton, K.W.T. Goulding, A.
Weigel & D.S. Powlson. 2000. Phosphorus content in soil, uptake by plants and
balance in three European long-term field experiments. Nutrient Cycling in
Agroecosystems, 56, 263-275.
N. Mahieu, D.S. Powlson & E.W. Randall. 1999. Statistical analysis of published
carbon-13 CPMAS NMR spectra of soil organic matter. Soil Science Society of America
Journal, 63, 307-319.
A.E. Johnston & D.S. Powlson. 1999. Fighting in the fields. Chemistry in Britain, 35, 1818.
D.S. Jenkinson, K. Goulding & D.S. Powlson. 1999. Nitrogen deposition and carbon
sequestration. Nature, 400, 629-629.
L. Blake, S. Mercik, M. Koerschens, K.W.T. Goulding, S. Stempen, A. Weigel, P.R.
Poulton & D.S. Powlson. 1999. Potassium content in soil, uptake in plants and the
potassium balance in three European long-term field experiments. Plant and Soil, 216,
1-14.
P. Tlustos, T.W. Willison, J.C. Baker, D.V. Murphy, D. Pavlikova, K.W.T. Goulding &
D.S. Powlson. 1998. Short-term effects of nitrogen on methane oxidation in soils.
Biology and Fertility of Soils, 28, 64-70.
P. Smith, D.S. Powlson, M.J. Glendining & J.U. Smith. 1998. Preliminary estimates of
the potential for carbon mitigation in European soils through no-till farming. Global
Change Biology, 4, 679-685.
D.S. Powlson, P. Smith, K. Coleman, J.U. Smith, M.J. Glendining, M. Korschens & U.
Franko. 1998. A European network of long-term sites for studies on soil organic matter.
Soil & Tillage Research, 47, 263-274.
D.S. Powlson. 1998. Phosphorus, agriculture and water quality - Foreword. Soil Use
and Management, 14, 123-123.
T.W. Willison, M.S. Oflaherty, P. Tlustos, K.W.T. Goulding & D.S. Powlson. 1997.
Variations in microbial populations in soils with different methane uptake rates. Nutrient
Cycling in Agroecosystems, 49, 85-90.
P. Smith, J.U. Smith, D.S. Powlson, W.B. McGill, J.R.M. Arah, O.G. Chertov, K.
Coleman, U. Franko, S. Frolking, D.S. Jenkinson, L.S. Jensen, R.H. Kelly, H. KleinGunnewiek, A.S. Komarov, C. Li, J.A.E. Molina, T. Mueller, W.J. Parton, J.H.M.
Thornley & A.P. Whitmore. 1997. A comparison of the performance of nine soil organic
matter models using datasets from seven long-term experiments. Geoderma, 81, 153225.
P. Smith, D.S. Powlson, J.U. Smith & E.T. Elliott. 1997. Special issue - Evaluation and
comparison of soil organic matter models using datasets from seven long-term
experiments - Preface. Geoderma, 81, 1-3.
P. Smith, D.S. Powlson, M.J. Glendining & J.U. Smith. 1997. Potential for carbon
sequestration in European soils: Preliminary estimates for five scenarios using results
from long-term experiments. Global Change Biology, 3, 67-79.
D.S. Powlson, K.W.T. Goulding, T.W. Willison, C.P. Webster & B.W. Hutsch. 1997. The
effect of agriculture on methane oxidation in soil. Nutrient Cycling in Agroecosystems,
49, 59-70.
A.J. Macdonald, P.R. Poulton, D.S. Powlson & D.S. Jenkinson. 1997. Effects of
season, soil type and cropping on recoveries, residues and losses of N-15-labelled
fertilizer applied to arable crops in spring. Journal of Agricultural Science, 129, 125-154.
M.J. Glendining, P.R. Poulton, D.S. Powlson & D.S. Jenkinson. 1997. Fate of N-15labelled fertilizer applied to spring barley grown on soils of contrasting nutrient. Plant
and Soil, 195, 83-98.
T.W. Willison, R. Cook, A. Muller & D.S. Powlson. 1996. CH4 oxidation in soils
fertilized with organic and inorganic-N; Differential effects. Soil Biology & Biochemistry,
28, 135-136.
P. Smith, J.U. Smith & D.S. Powlson. 1996. Moving the British cattle herd. Nature, 381,
15-15.
M.A. Shepherd, E.A. Stockdale, D.S. Powlson & S.C. Jarvis. 1996. The influence of
organic nitrogen mineralization on the management of agricultural systems in the UK.
Soil Use and Management, 12, 76-85.
S.C. Jarvis, E.A. Stockdale, M.A. Shepherd & D.S. Powlson. 1996. Nitrogen
mineralization in temperate agricultural soils: Processes and measurement. Advances
in Agronomy, Vol 57, 57, 187-235.
K.W.T. Goulding, T.W. Willison, C.P. Webster & D.S. Powlson. 1996. Methane fluxes in
aerobic soils. Environmental Monitoring and Assessment, 42, 175-187.
M.J. Glendining, D.S. Powlson, P.R. Poulton, N.J. Bradbury, D. Palazzo & X. Li. 1996.
The effects of long-term applications of inorganic nitrogen fertilizer on soil nitrogen in
the Broadbalk wheat experiment. Journal of Agricultural Science, 127, 347-363.
T.W. Willison, C.P. Webster, K.W.T. Goulding & D.S. Powlson. 1995. Methane
Oxidation in Temperate Soils - Effects of Land-Use and the Chemical Form of NitrogenFertilizer. Chemosphere, 30, 539-546.
T.W. Willison, K.W.T. Goulding & D.S. Powlson. 1995. Effect of Land-Use Change and
Methane Mixing-Ratio on Methane Uptake from United-Kingdom Soil. Global Change
Biology, 1, 209-212.
E.W. Randall, N. Mahieu, D.S. Powlson & B.T. Christensen. 1995. Fertilization effects
on organic matter in physically fractionated soils as studied by C-13 NMR: Results from
two long-term field experiments. European Journal of Soil Science, 46, 557-565.
P. Kinchesh, D.S. Powlson & E.W. Randall. 1995. C-13 Nmr-Studies of Organic-Matter
in Whole Soils .2. a Case-Study of Some Rothamsted Soils. European Journal of Soil
Science, 46, 139-146.
P. Kinchesh, D.S. Powlson & E.W. Randall. 1995. C-13 Nmr-Studies of Organic-Matter
in Whole Soils .1. Quantitation Possibilities. European Journal of Soil Science, 46, 125137.
K.W.T. Goulding, B.W. Hutsch, C.P. Webster, T.W. Willison & D.S. Powlson. 1995. The
Effect of Agriculture on Methane Oxidation in Soil. Philosophical Transactions of the
Royal Society of London Series a-Mathematical Physical and Engineering Sciences,
351, 313-324.
J.H. Duyzer, M.A. Sutton, P. Ineson & D.S. Powlson. 1995. Plant Atmosphere
Exchange of Ammonia - Discussion. Philosophical Transactions of the Royal Society of
London Series a-Mathematical Physical and Engineering Sciences, 351, 276-278.
B.W. Hutsch, C.P. Webster & D.S. Powlson. 1994. Methane Oxidation in Soil as
Affected by Land-Use, Soil-Ph and N-Fertilization. Soil Biology & Biochemistry, 26,
1613-1622.
R. Abubakar, K.W.T. Goulding, C.P. Webster, P.R. Poulton & D.S. Powlson. 1994.
Estimating Nitrate Leaching and Denitrification by Simultaneous Use of Br and N-15
Tracers. Journal of the Science of Food and Agriculture, 66, 509-519.
D.S. Powlson. 1993. Understanding the Soil-Nitrogen Cycle. Soil Use and
Management, 9, 86-94.
B.W. Hutsch, C.P. Webster & D.S. Powlson. 1993. Long-Term Effects of NitrogenFertilization on Methane Oxidation in Soil of the Broadbalk Wheat Experiment. Soil
Biology & Biochemistry, 25, 1307-1315.
P.B.S. Hart, D.S. Powlson, P.R. Poulton, A.E. Johnston & D.S. Jenkinson. 1993. The
Availability of the Nitrogen in the Crop Residues of Winter-Wheat to Subsequent Crops.
Journal of Agricultural Science, 121, 355-362.
K.W.T. Goulding, C.P. Webster, D.S. Powlson & P.R. Poulton. 1993. Denitrification
Losses of Nitrogen-Fertilizer Applied to Winter-Wheat Following Ley and Arable
Rotations as Estimated by Acetylene Inhibition and N-15 Balance. Journal of Soil
Science, 44, 63-72.
D.S. Powlson, P.B.S. Hart, P.R. Poulton, A.E. Johnston & D.S. Jenkinson. 1992.
Influence of Soil Type, Crop Management and Weather on the Recovery of N-15Labeled Fertilizer Applied to Winter-Wheat in Spring. Journal of Agricultural Science,
118, 83-100.
P. Kinchesh, D.S. Powlson, E.W. Randall & S.C.R. Williams. 1992. Nmr Imaging of N14 in Solution. Journal of Magnetic Resonance, 97, 208-212.
T.M. Addiscott & D.S. Powlson. 1992. Partitioning Losses of Nitrogen-Fertilizer
between Leaching and Denitrification. Journal of Agricultural Science, 118, 101-107.
S.M. Shen, P.B.S. Hart, D.S. Powlson & D.S. Jenkinson. 1989. The Nitrogen-Cycle in
the Broadbalk Wheat Experiment - N-15-Labelled Fertilizer Residues in the Soil and in
the Soil Microbial Biomass. Soil Biology & Biochemistry, 21, 529-533.
P.G. Saffigna, D.S. Powlson, P.C. Brookes & G.A. Thomas. 1989. Influence of
Sorghum Residues and Tillage on Soil Organic-Matter and Soil Microbial Biomass in an
Australian Vertisol. Soil Biology & Biochemistry, 21, 759-765.
D.S. Powlson, P.R. Poulton, N.E. Moller, M.V. Hewitt, A. Penny & D.S. Jenkinson.
1989. Uptake of Foliar-Applied Urea by Winter-Wheat (Triticum-Aestivum) - the
Influence of Application Time and the Use of a New N-15 Technique. Journal of the
Science of Food and Agriculture, 48, 429-440.
A.J. Macdonald, D.S. Powlson, P.R. Poulton & D.S. Jenkinson. 1989. Unused Fertilizer
Nitrogen in Arable Soils - Its Contribution to Nitrate Leaching. Journal of the Science of
Food and Agriculture, 46, 407-419.
D.S. Powlson, P.G. Saffigna & M. Kragt-Cottaar. 1988. Denitrification at Suboptimal
Temperatures in Soils from Different Climatic Zones. Soil Biology & Biochemistry, 20,
719-723.
M. Chabrol, D.S. Powlson & D. Hornby. 1988. Uptake by Maize (Zea-Mays-L) of
Nitrogen from N-15-Labelled Dazomet, N-15-Labelled Fertilizer and from the Soil
Microbial Biomass. Soil Biology & Biochemistry, 20, 517-523.
T.M. Addiscott, D.S. Jenkinson & D.S. Powlson. 1988. Nitro Gen. New Scientist, 117,
75-75.
D.S. Powlson, P.R. Poulton, A. Penny & M.V. Hewitt. 1987. Recovery of N-15-Labeled
Urea Applied to the Foliage of Winter-Wheat. Journal of the Science of Food and
Agriculture, 41, 195-203.
D.S. Powlson, P.C. Brookes & B.T. Christensen. 1987. Measurement of Soil Microbial
Biomass Provides an Early Indication of Changes in Total Soil Organic-Matter Due to
Straw Incorporation. Soil Biology & Biochemistry, 19, 159-164.
D.S. Powlson, G. Pruden, A.E. Johnston & D.S. Jenkinson. 1986. The Nitrogen-Cycle
in the Broadbalk Wheat Experiment - Recovery and Losses of N-15-Labeled Fertilizer
Applied in Spring and Inputs of Nitrogen from the Atmosphere. Journal of Agricultural
Science, 107, 591-609.
D.S. Powlson, P.B.S. Hart, G. Pruden & D.S. Jenkinson. 1986. Recovery of N-15Labeled Fertilizer Applied in Autumn to Winter-Wheat at 4 Sites in Eastern England.
Journal of Agricultural Science, 107, 611-620.
P.C. Brookes, D.S. Powlson & D.S. Jenkinson. 1986. Microbial Phosphorus in Soils.
Journal of the Science of Food and Agriculture, 37, 19-19.
G. Pruden, D.S. Powlson, S.J. Kalembasa & D.S. Jenkinson. 1985. New Techniques
for Analysis of N-15 in Crops and Soils. Journal of the Science of Food and Agriculture,
36, 277-278.
G. Pruden, D.S. Powlson & D.S. Jenkinson. 1985. The Measurement of N-15 in Soil
and Plant-Material. Fertilizer Research, 6, 205-218.
D.S. Powlson & E.W. Randall. 1985. Some Applications of Nuclear MagneticResonance Spectroscopy in Soil Science. Journal of the Science of Food and
Agriculture, 36, 270-271.
D.S. Powlson, D.S. Jenkinson, G. Pruden & A.E. Johnston. 1985. The Effect of Straw
Incorporation on the Uptake of Nitrogen by Winter-Wheat. Journal of the Science of
Food and Agriculture, 36, 26-30.
P.C. Brookes, J.F. Kragt, D.S. Powlson & D.S. Jenkinson. 1985. Chloroform
Fumigation and the Release of Soil-Nitrogen - the Effects of Fumigation Time and
Temperature. Soil Biology & Biochemistry, 17, 831-835.
G.E. Hawkes, D.S. Powlson, E.W. Randall & K.R. Tate. 1984. A P-31 Nuclear
Magnetic-Resonance Study of the Phosphorus Species in Alkali Extracts of Soils from
Long-Term Field Experiments. Journal of Soil Science, 35, 35-45.
P.C. Brookes, D.S. Powlson & D.S. Jenkinson. 1984. Phosphorus in the Soil Microbial
Biomass. Soil Biology & Biochemistry, 16, 169-175.
T.M. Woodcock, G. Pruden, D.S. Powlson & D.S. Jenkinson. 1982. Apparatus for
Applying N-U5-Labeled Fertilizer Uniformly to Field Microplots. Journal of Agricultural
Engineering Research, 27, 369-372.
P.C. Brookes, D.S. Powlson & D.S. Jenkinson. 1982. Measurement of Microbial
Biomass Phosphorus in Soil. Soil Biology & Biochemistry, 14, 319-329.
D.S. Powlson & D.S. Jenkinson. 1981. A Comparison of the Organic-Matter, Biomass,
Adenosine-Triphosphate and Mineralizable Nitrogen Contents of Ploughed and DirectDrilled Soils. Journal of Agricultural Science, 97, 713-721.
P.C. Brookes, D.S. Powlson & D.S. Jenkinson. 1981. Microbially Bound Phosphates in
Soils. Journal of the Science of Food and Agriculture, 32, 632-632.
P.C. Brookes & D.S. Powlson. 1981. Preventing Phosphorus Losses During PerchloricAcid Digestion of Sodium-Bicarbonate Soil Extracts. Journal of the Science of Food and
Agriculture, 32, 671-674.
D.S. Powlson. 1980. The Effects of Grinding on Microbial and Non-Microbial OrganicMatter in Soil. Journal of Soil Science, 31, 77-85.
D.S. Powlson. 1980. Effect of Cultivation on the Mineralization of Nitrogen in Soil. Plant
and Soil, 57, 151-153.
D.S. Jenkinson & D.S. Powlson. 1980. Measurement of Microbial Biomass in Intact Soil
Cores and in Sieved Soil. Soil Biology & Biochemistry, 12, 579-581.
D.S. Powlson & D.S. Jenkinson. 1979. Effects of Direct Drilling on the Amount and
Behavior of Organic-Matter in Soil. Journal of the Science of Food and Agriculture, 30,
331-332.
D.S. Jenkinson, S.A. Davidson & D.S. Powlson. 1979. Adenosine-Triphosphate and
Microbial Biomass in Soil. Soil Biology & Biochemistry, 11, 521-527.
D.S. Powlson & D.S. Jenkinson. 1976. Effects of Biocidal Treatments on Metabolism in
Soil .2. Gamma-Irradiation, Autoclaving, Air-Drying and Fumigation. Soil Biology &
Biochemistry, 8, 179-188.
D.S. Jenkinson, D.S. Powlson & R.W.M. Wedderburn. 1976. Effects of Biocidal
Treatments on Metabolism in Soil .3. Relationship between Soil Biovolume, Measured
by Optical Microscopy, and Flush of Decomposition Caused by Fumigation. Soil Biology
& Biochemistry, 8, 189-202.
D.S. Jenkinson & D.S. Powlson. 1976. Effects of Biocidal Treatments on Metabolism in
Soil .5. Method for Measuring Soil Biomass. Soil Biology & Biochemistry, 8, 209-213.
D.S. Jenkinson & D.S. Powlson. 1976. Effects of Biocidal Treatments on Metabolism in
Soil .1. Fumigation with Chloroform. Soil Biology & Biochemistry, 8, 167-177.
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