Woburn Ley-Arable Long Term Soil Organic Matter/Cropping ExperimentEntry ID: IACR.Woburn
Abstract: This experiment began in 1938 at a cool temperate site in
England. There are 3 soil series present on the experiment. Cottenham,
brown sand on Lower Greensand. Lowlands, colluvial brown earth in
sandy colluvium (SSEW). Flitwick, gleyic brown earth in sandy
colluvium. All classified as Cambic Arenosols (FAO) and under USDA
classification as Quartzipsammentic Haplumbrept, Cumulic Haplumbrept
and ... Aquic Haplumprept respectively.
The land use and treatments in this experiment are as follows: 3 main
types A (arable), L (ley-arable), LL (long ley-arable). A - 3 yrs
treatment crops followed by 2 test crops, subdivided F (fallow) and B
(barley) in the treatment crops [r (roots) and h (hay) before 1968]. L
- 3 yrs ley followed by 2 arable test crops subdivided n3 (grass+N)
and c3(grass/clover ley) [grass/clover ley+N or lucerne before
1968]. LL - similar to L but 8 year leys [before 1976 alternated
between arable and ley-arable rotations, ie ley for 3yrs out of 10].
Treatments: Until 1967 38 t/ha FYM tested on half-plots. Since 1968
half-plots split to test 4 N rates on test crops. Currently
0,70,140,210 kg N/ha on crop 1=winter wheat; 0,30,60,90 kg N/ha on
crop 2=winter rye. All plots receive chalk (currently Dolomitic
Limestone) every 5 years.
The measurements made (data available), frequency, and methodology are
a) Vegetation measurements made and frequency
Yield: Annually (grain & herbage yields)
Nitrogen content of offtake: N in test crops (not in straw)
measured since about 1970. N in treatment ley crops measured since
P, K, Ca, Mg, Na measured in treatment ley crops since 1985 and in
test crops since 1990.
b) Soil sampling
Time zero soil measurements taken. Samples taken in 1938 from
each of the 5 blocks of the experiment - analysed for %C and
archived. Depth 0-23,23-46 cm.
Details of soil sampling method: Semi-cylindrical auger, 16 cores
per half-plot avoiding 1m at edges of plot. Soil is separated into layers.
Details of measuring depths and soil layers: All 80xhalf-plots
sampled 0-25,25-50 cm in 1957 and again in 1960-65. Since 1963 one
block (16xhalf-plots) sampled 0-25 cm each year.
c) Soil measurements made and frequency
Total carbon: Every year since 1957
Method of measuring total carbon: Tinsley
Soil bulk density or weight: Once only
Method of measuring soil bulk density or weight: Using 6x6x9 inch
(15.2x15.2x22.9 cm) oopen ended metal box.
Other nutrients: Bicarbonate soluble P (Olsen); exchangeable K, Ca,
Mg, Na (Metson); pH in water.
Atmospheric inputs: Current estimates for N deposition at Woburn
are 30-40 kg N/ha/yr. See Goulding (1990) S.U.M. 6.2 p61-63.
Other measurements: Concentrations of NO3-N in soil water, using
porous cups. Selected treatments 1993-94.
d) Details of the meteorological station
Nearest meteorological station to the site: Woburn. Total N by
combustion (LECO) 1980 onwards. which is 2 km from the site at
coordinates 0deg36min W, 52deg2min N. The meteorological station is manual.
e) Meteorological data available and frequency
Rainfall: Read daily
Air temperature: Continuous
Soil temperature: Read daily at 10 cm depth
Wind speed: Continuous
Net Radiation: Continuous
Sun hours: Continuous
Relative humidity: Calculated
Potential evapotranspiration: Calculated measured/calculated by
Evaporation from open pans. Potential Soil Moisture Deficit calculated
using Penman equation.
f) Isotope measurements available and frequency
Nitrogen 15 measurements in vegetation: Once 1984
Total soil nitrogen 15 measurements: Once 1984
Total soil mineral nitrogen 15 measurements: Once 1984
Details of isotope measurements: Not yet published: N-15 uptake by 1st
test crop w.wheat, in grain, straw, chaff, stubble, and N-15
remaining in soil.
g) Archived samples available
Archived soil samples: Each year from 1957 (plus 1938) dating from
Archived crop samples: All dating from 1938
DATA AVAILABLE IN ELECTRONIC FORMAT
Yield data available in electronic format from 1970
Nitrogen content of offtake data available in electronic format
Data available in electronic format for rainfall from 1853
Data available in electronic format for air temperature from 1878
Data available in electronic format for soil temperature from 1931
Data available in electronic format for wind speed from 1946
Data available in electronic format for net radiation from 1931
Data available in electronic format for sun hours from 1890
Data available in electronic format for relative humidity from 1925
This information was compiled for the GCTE-SOMNET Database, Pete
Smith, Pete Falloon, David Powlson, and Jo Smith. Soil Science
Department, IACR-Rothamsted, UK.
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This data set description is a member of a collection. The collection is described in
Start Date: 2000-10-01Stop Date: 2000-10-13
Data Set Progress
Distribution Media: Online HTTP
Email: gregg at wps2.com
Creation and Review Dates
DIF Creation Date: 2010-05-04
Last DIF Revision Date: 2010-05-11