Non-crop Biomass of the Weed and Fertilizer Study — Main Cropping System Experiment (MCSE)
Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use
To estimate weed pressure, the aboveground biomass of non-crop species in the Weed and Fertilizer Study microplots was sampled just before harvest of main crops and cover crops. Plants within a quadrat were clipped at ground level, either sorted to species, or into grasses and forbs, or left unsorted, then dried and weighed.
This datatable is part of the Weed and Fertilizer Study in T3 and T4 dataset.
A microplot study was conducted in the Reduced input (T3) and Biologically based (T4) treatments of the LTER Main Cropping System Experiment (2006-2014) to examine the effect of weed control and fertilization on crop yields. Microplot treatments were a factorial combination of 3 weed control strategies and 2 fertilization levels for a total of 6 microplots, each 15 ft wide (E-W) by 50 ft long (N-S) and randomly assigned within a block in the northwest corner of each replicate (R1-R6). Weed control strategies included: Business as Usual (BAU, same weed control as the main T3 or T4 plots); Weed Free (no weeds allowed to become established); and No Weed Control (no form of weed control). Fertilizer was applied at two levels: Fertilized (same level as applied to the Conventional T1 main plots) and Unfertilized (no fertilizer applied).
Note
| Experiment: | Main Cropping System Experiment (MCSE) |
| Data available from: | September 2006 to July 2013 |
| Dataset: | KBS150 |
| Datatable ID: | KBS150-001.17 |
| Core Areas | Primary Production,Populations |
| Repository link: | |
| Related Tables: | |
| Personnel: |
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| Last Updated | 2024-04-25 |
| Variate | Description | Units |
|---|---|---|
| sample date | the sample date | |
| treatment | the treatment name | |
| replicate | the replicate plot | |
| weed control | the weed control treatment | |
| fertilizer treatment | the fertilizer treatment | |
| species code | the KBS species code | |
| species | the species collected | |
| biomass g m2 | the dry biomass collected | g/m2 |
| area sampled | the sample area cut to collect the sample | |
| comment | any comments about this sample |
Data Excerpt
| sample_date | treatment | replicate | weed_control | fertilizer_treatment | species_code | species | biomass_g_m2 | area_sampled | comment |
|---|---|---|---|---|---|---|---|---|---|
| 2013-07-26 | T3 | R5 | business as usual | fertilized | UNSRTDIC | Unsorted dicots (forbs) | 0.56 | 0.25 | |
| 2013-07-26 | T3 | R5 | business as usual | fertilized | UNSRTGRS | Unsorted grasses | 88.568 | 0.25 | |
| 2013-07-26 | T3 | R5 | business as usual | fertilized | UNSRTGRS | Unsorted grasses | 50.888 | 0.25 | |
| 2013-07-26 | T3 | R5 | business as usual | unfertilized | UNSRTDIC | Unsorted dicots (forbs) | 10.828 | 0.25 | |
| 2013-07-26 | T3 | R5 | business as usual | unfertilized | UNSRTDIC | Unsorted dicots (forbs) | 1.2 | 0.25 |