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Independent third-party performance data — land-grant programs that test every entered brand side-by-side with replication + LSD stats. This is the legitimate way to get Pioneer / DEKALB / Brevant / Channel performance the corpus can't scrape directly (data_type=trial, results[] shape; falls through the trial chunker). - illinois_vt_trials (30 docs, 1,392 rows) — U of Illinois VT. Per-region XLSX (openpyxl), corn + soy + WHEAT, 2024+2025. Rich per-site agronomic metadata; corn-following-corn vs -soybean kept distinct. - iowa_icpt_trials (24 docs, 674 rows) — Iowa State ICPT. ASP.NET GridView (viewstate postback for year/district), corn + soy by district x season. - ohio_ocpt_trials (69 docs, 4,647 rows) — OSU/CFAES OCPT. Report PDF (pdfplumber; per-site column groups split by header Yield-token count + x-coord footnote bucketing), corn + soy per site, 2024+2025. 91 distinct seed brands across the three; majors confirmed present in the independent rankings: DEKALB 395, Golden Harvest 249, Channel 241, NK 212, Xitavo 135, LG 103, Pioneer 88, Asgrow 59. (A brand only appears where it ENTERED a given program — e.g. Brevant not in Iowa, DEKALB/Channel not in Illinois — true negatives, not parse gaps.) - rag/chunk.py: gated `include_region` on _render_gh_plot_chunk; the 3 university sources route through it so the region/district is in the embedded chunk + labeled "variety trial (cross-vendor, independent third-party)". Existing plot sources (gh/lg/agrigold/proharvest) unchanged. - requirements.txt: openpyxl (Illinois XLSX; scrape-time only). - sources.json + README/CLAUDE/lessons: registered + attributed; lessons trial-data + Pioneer entries updated (Pioneer/DEKALB performance now available indirectly via these trials). Validation: all 123 chunk via rag.chunk.chunks_from_trial (0 errors), 0 out-of-range yields, 0 dup keys. Public land-grant data; attribution recorded in each tos_note. CI rebuilds the index from the committed corpus.
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Corn yield trial — University of Illinois VT, Urbana CFC, IL 2024
- Publisher: University of Illinois Variety Testing (independent cross-vendor trial)
- Crop: Corn
- State: IL
- Year: 2024
- Region: Urbana CFC
- Rotation: corn following corn
- Previous crop: corn
- Cooperator / host: Darin Joos
- County: Chamapign
- Sites: Urbana
- Soil type: Drummer silty clay loam
- Tillage: None
- Planted: 2024-05-20
- Harvested: 2024-10-18
- Source XLSX: https://vt.cropsci.illinois.edu/wp-content/uploads/2024/11/Urbana-CFC-Table-2024.xlsx
- Index page: https://vt.cropsci.illinois.edu/corn/
Results (ranked by regional yield)
| Rank | Brand | Product | Traits | Yield | Moisture | Lodging | Maturity |
|---|---|---|---|---|---|---|---|
| 1 | Prairie | 6755 | - | 190.876 | 16.64 | 0.33 | 110 |
| 2 | Prairie | 6854 | - | 179.6544 | 14.33 | 1 | 110 |
| 3 | Prairie | 7184 | - | 176.0747 | 16.85 | 1 | 112 |
| 4 | Prairie | 8864 | - | 170.8097 | 18.23 | 1 | 114 |
| 5 | Prairie | 8683 | - | 164.3276 | 20.2 | 0.67 | 115 |
| 6 | Prairie | 9703 | - | 158.9303 | 18.57 | 1 | 116 |