Baseline Spatial Variability Study - Soybean Biomass and Carbon/Nitrogen Content — Main Cropping System Experiment (MCSE)

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Soybean biomass at harvest was determined for an array of geo-referenced points prior to the start of the Main Cropping System Experiment.

This datatable is part of the Baseline Spatial Variability Study dataset. A spatial variability study conducted across the LTER Main Site area (45 ha) at KBS prior to dividing the site into 1-ha experimental plots. During the 1988 growing season a stratified unaligned sampling scheme was used to collect 400-600 geo-referenced samples across the site (uniformly planted to a single variety of soybeans) for:

  1. geomorphological characteristics (microtopography, soil horizon depths, bulk density, texture);
  2. soil chemical characteristics (pH, NO3, NH4, total C, total N, moisture, inorganic P, trace metals);
  3. soil biological characteristics (N mineralization potentials, microbial biomass C, microbial biomass N, fungal/bacterial ratios, nematodes and other soil invertebrates; seed bank size);
  4. plant weed species abundance, weed biomass at peak standing crop); and
  5. insect characteristics (major pest and predator species).

Most soil samples (0-15cm) were taken before crop emergence, plant phenology samples were taken throughout the growing season, biomass samples were taken at physiological maturity, and insect samples were taken continuously. Dried soil and plant samples are archived for potential future analysis.


Experiment: Main Cropping System Experiment (MCSE)
Data available from: January 1988
Dataset: KBS003
Datatable ID: KBS003-006.48
Core Areas Primary Production,Populations,Organic Matter,Disturbance
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Related Tables:
Last Updated 2020-07-10
Variate Description Units
year year of the observation
easting easting of the sample location in UTM 16N meter
northing northing of sample location in UTM 16N meter
soyn soybean whole-plant N content at maturity in %N %
soyc soybean whole-plant C content at maturity in %C %
soycn soybean whole-plant C:N ratio dimensionless
soy gm soybean whole-plant biomass at maturity (areal basis) in g/m2 g/m2
soy gp soybean whole-plant biomass at maturity (per plant basis) in g/ plant gram
soy n gm soybean whole-plant N content at maturity (areal basis) in g N/m2 grams/year

Data Excerpt

year easting northing soyn soyc soycn soy_gm soy_gp soy_n_gm
1988 633981 4696121
1988 634280 4696128 3.23 43.7 13.53 240.16 18.3 7.76
1988 634081 4696127 3.03 42.57 14.05 134.86 20.55 4.09
1988 633913 4696126 3.84 43.23 11.26 245.89 31.23 9.44
1988 633914 4696128 3.82 45.1 11.81 250.39 63.6 9.56
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