Activity report

Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use

This table lists the activities and the equipment used on replicate 1. Other replicates might be different.

This datatable is part of the Main Cropping System Experiment Field Logs and treatment descriptions dataset. This dataset includes information about the LTER main site treatments, agronomic practices carried out on the treatments and approved site use requests.

Most long-term hypotheses associated with the KBS LTER site are being tested within the context of the main cropping systems study. This study was established on a 48 ha area on which a series of 7 different cropping systems were established in spring 1988, each replicated in one of 6 ha blocks. An eighth never-tilled successional treatment, is located 200 m off-site, replicated as four 0.06 ha plots.

Cropping systems include the following treatments:

  • T1. Conventional: standard chemical input corn/soybean/wheat rotation conventionally tilled (corn/soybean prior to 1992)
  • T2. No-till: standard chemical input corn/soybean/wheat rotation no-tilled (corn/soybean prior to 1992)
  • T3. Reduced input: low chemical input corn/soybean/wheat rotation conventionally tilled (ridge till prior to 1994)
  • T4. Biologically based: zero chemical input corn/soybean wheat rotation conventionally tilled (ridge till prior to 1994)
  • T5. Poplar: Populus clones on short-rotation (6-7 year) harvest cycle
  • T6. Alfalfa: continuous alfalfa, replanted every 6-7 years (converted to switchgrass in 2018)
  • T7. Early successional community: historically tilled soil
  • T8. Mown grassland community: never-tilled soil.

For specific crops in a given year see the Annual Crops Summary Table.

In 1993 a series of forest sites were added to the main cropping system study to provide long-term reference points and to allow hypotheses related to substrate diversity to be tested. These include:

  • TCF. Coniferous forest: three conifer plantations, 40-60 years old
  • TDF. Decidious forest: three deciduous forest stands, two old-growth and one 40-60 years post-cutting
  • TSF. Mid-successional forest: three old-field (mid-successional) sites 40+ years post-abandonment.

All share a soil series with the main cropping system treatments, and are within 5 km of all other sites.

For each system (and for a number of microplot treatments nested within the main treatment plots) the following baseline variates are being measured (described in greater detail in other data set descriptors):

  • plant characteristics, including species distributions and abundances, net aboveground productivity by functional group (crop vs. non dominant biomass, selected non dominant biomass), economic yields, tissue C and N contents, seed bank composition;
  • soil chemical and physical characteristics, including soil moisture, pH, inorganic N and P pools, total C, N, and P pools, bulk density;
  • soil biological characteristics, including microbial biomass C and N, N mineralization rates (buried bags), microbial populations, invertebrate populations; and
  • insect and pathogen dynamics, including distributions and abundances of major insect pests and predators and of Fusarium pathogens.

Note

Experiment: Main Cropping System Experiment (MCSE)
Data available from: May 1988 to January 2020
Dataset: KBS004
Datatable ID: KBS004-012.98
Repository link: http://doi.org/10.6073/pasta/982d060e64a17a152de6234a5325edf5
Related Tables:
Personnel:
Last Updated 2020-07-10
Variate Description Units
Obs date observation date
Treatment experimental treatment
Plot plot where the activity occured
Observation type type of activity.
Equipment equipment used during the activity.

Data Excerpt

obs_date treatment plot observation_type equipment
2020-07-09 T4 T4R1 Weed control John Deere 856 15' 6 row S-tine row crop cultivator
2020-06-26 T4 T4R1 Weed control John Deere 856 15' 6 row S-tine row crop cultivator
2020-06-25 T3 T3R1 Weed control TurboTwinJet 1103 Flat Fan Nozzles
2020-06-25 T3 T3R1 Pesticide application TurboTwinJet 1103 Flat Fan Nozzles
2020-06-25 T3 T3R1 Pesticide application Top Air Sprayer
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