Planting details in replicate 1

Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use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 datatable is part of the Main Cropping System Experiment 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: November 1988 to March 2016
Dataset: KBS004
Datatable ID: KBS004-013.69
Related Tables:
Personnel:
Last Updated 2017-10-24
Variate Description Units
obs date The observation date
Treatment experimental treatment
Material material used
Rate rate of application number
Unit units per acre
Comment aa note about the sample

Data Excerpt

obs_date treatment material rate unit comment
2019-11-05 T6 rye unknown Planted rye cover crop in the northwest corner micro-plot areas. Equipment Used: JD 7420a tractor and JD 1590 no-till drill.
2019-08-22 T3 Red Clover 'Medium Red Clover' 0.0 pound No-till seeded red clover at 11 lbs/A pure live seed (clover was planted at 19.5 lbs/A to achieve 11 lbs/A pure live seed giving coating material and germination percent) in the LTER Main Site T3 plots all replications (5,2,3,1,4,6). Original target rate was 12lbs/A. After planting and weighing left over clover the actual planting rate was 11lbs/A pure live seed at a rate of 19.5lbs/A. To prevent weed pressure in the spring, T3 plots were sprayed and it was decided red clover would be seeded following harvest. Plots were sprayed with a pre-plant burn down to control the post harvest weed flush. Clover planted 1/4 inch into the ground.
2019-03-18 T4 Red Clover 'Medium Red Clover' 11.0 pound Seeded LTER Main Site Treatment T4 all replications (5, 3, 2, 1, 6, 4), with Medium Red Clover at 12 lbs/A. Clover seed had a coating that was 34.29% of the seed weight. A pure live seed calculation was done to calculate amount of seed per acre needed to achieve the 12 lbs/A of pure live seed. The calculation equaled 31 lbs/A seeding rate to achieve the 12 lbs/A of pure seed (see papers attached). Clover was seeded with John Deere 5220 tractor traveling at 5.0 mph, gear C1 at 1600 rpm’s, and Gandy Air Seeder (15 ft boom length) equipped with 8 deflectors spaced 22.5 inches. Gandy motor setting was ? with the red metering wheels in and the gates on the Gandy were in the first position. Boom height was 23 inches from the ground, bottom of the defectors were 20 inches from the ground. Start of application was 6:30 a.m. weather was clear 20 degrees F 0 mph wind. End of application 10:30 a.m. sunny 30 degrees F 0 mph wind. Total amount of seed added was 450 pounds with 85 pounds remaining at the end. so 365 pounds of seed applied over 13 acres equals 28 lbs/A seeding rate.This equals almost 11 lbs/A pure live seed.
2018-10-27 T4 Pioneer 25R40 Soft Red Winter Wheat (untreated) 163.6 pound Planted winter wheat in T4 plots all treatments (R6, R5, R4, R3, R2, R1). Wheat variety: Pioneer 25R40 which is a soft red winter wheat, the seed was not treated. Pioneer 25R40 (untreated seed) had 12,500 seeds/lb (90% germ) planted at 163.6 lbs/A (2,045,000 seeds per acre). Planting depth:1”. Planted with JD 7420b tractor and JD 1590 no-till drill. Average planting speed was 4.4 mph.
2018-10-26 T3 Pioneer 25R40 soft red winter wheat (Treated) 163.6 pound Planted winter wheat in T3, Reps (5, 4, 2, 1, 6) Rep 3 was planted 10-19-2018 but delayed due to rain.Wheat variety: Pioneer 25R40 which is a soft red winter wheat, the seed was treated. Pioneer 25R40 (treated seed) had 11,500 seeds/lb (90% germ) planted at 163.6 lbs/A (1,881,400 seeds per acre). Planting depth:1”. Planted with JD 7420b tractor and JD 1590 no-till drill. Average planting speed was 4.4 mph.
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