Agronomic Soil Chemistry — Switchgrass NItrogen Fixation Experiemnt
Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use
Agronomic chemistry of surface (0-25 cm) soils of the Switchgrass Nitrogen Fixation Experiment (plots 1-16) planted to switchgrass in 2016. Soils are occasionally collected in the fall (usually after harvest) for fertilizer and liming recommendations and analyzed for pH, lime index, phosphorus, potassium, calcium, magnesium, and cation exchange capacity by an analytical service laboratory.
This datatable is part of the Interactions Experiment dataset.
This dataset contains data from the Interactions Experiment established in 1985 that examined the interactive effects of tillage (conventional (CT) and no tillage (NT)) and fertilization (ferti lized (F) and not-fertilized (NF)) on crop production. The experimental site contained two areas that differed in prior land use: one site was historically tilled (pl ots 1-16) and the other has never been tilled (plots 17-24). All cropped plots (all plots except the Reference plots) were originally planted to continuous corn and s witched to the same corn-soybean-wheat rotation as the LTER Main Cropping System Experiment (MCSE) around 2001. The historically tilled portion of the experiment was discontinued after the 2015 harvest and 2016 conversion to switchgrass. The experiment continues in the never tilled plots including the cropped plots (T8nt; 17, 20, 21, and 24) which follow the rotation and management of the MCSE No-till (T2) treatment and the reference plots (T8; 18, 19, 22, and 23) which are maintained as the MCSE Mown Grassland (T8) treatment. T8 and T8nt data are found in MCSE da tasets.
Note
| Experiment: | Switchgrass NItrogen Fixation Experiemnt |
| Data available from: | October 2018 |
| Dataset: | KBS151 |
| Datatable ID: | KBS128-001.74 |
| Core Areas | Inorganic Nutrients |
| Repository link: | |
| Related Tables: | |
| Personnel: |
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| Last Updated | 2024-04-24 |
| Variate | Description | Units |
|---|---|---|
| sample date | sample date | |
| treatment | CT = Conventional tillage, NT = No-till, F = fertilized, N = unfertilized | |
| replicate | replicate block | |
| plot | whole plots (1-16), and plot id+MO (2, 6, 9, 13) stands for plots that have monoliths installed within. | |
| depth | depth of soil sampled | |
| pH | pH | |
| cec | cation exchange capacity (meq/100g) | meq/100g |
| phosphorus | Bray P1 phosphorus (ppm) | µg/kg |
| potassium | Potassium (ppm) | µg/kg |
| calcium | Calcium (ppm) | µg/kg |
| magnesium | Magnesium (ppm) | µg/kg |
| lime index | Lime Index | |
| comment | ||
| year | Sample year |
| Protocols |
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Data Excerpt
| sample_date | treatment | replicate | plot | depth | ph | cec | phosphorus | potassium | calcium | magnesium | lime_index | comment | year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018-10-15 | NT-F | 2.0 | INT10 | 0-25 cm | 6.2 | 6.8891025 | 30.0 | 90.0 | 1015.0 | 190.0 | 70.0 | 2018.0 | |
| 2018-10-15 | CT-N | 3.0 | INT11 | 0-25 cm | 6.7 | 7.041282 | 37.0 | 85.0 | 1038.0 | 196.0 | 71.0 | 2018.0 | |
| 2018-10-15 | CT-F | 1.0 | INT01 | 0-25 cm | 6.0 | 5.844359 | 31.0 | 68.0 | 879.0 | 153.0 | 70.0 | 2018.0 | |
| 2018-10-15 | CT-N | 2.0 | INT02 | 0-25 cm | 6.5 | 6.749615 | 58.0 | 98.0 | 983.0 | 190.0 | 71.0 | 2018.0 | |
| 2018-10-15 | NT-F | 4.0 | INT12 | 0-25 cm | 6.2 | 5.931923 | 37.0 | 56.0 | 901.0 | 154.0 | 70.0 | 2018.0 |