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seed-mcp/corpus/iowa_icpt_trials/icpt-corn-2024-central-early.md
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claude 54094a0d43 Add university-extension variety trials: Illinois VT + Iowa ICPT + Ohio OCPT (+123 trial docs)
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.
2026-06-10 08:35:50 -04:00

5.0 KiB

Corn yield trial — Iowa Central District (Early Season), 2024

  • Source: Iowa Crop Performance Tests (independent third-party trial)
  • Publisher: Iowa State University / Iowa Crop Improvement Association
  • Crop: Corn
  • State: IA
  • District: Central
  • Maturity season: Early Season
  • Year: 2024
  • Experiment mean yield: 237 bu/a
  • Cooperator sites: Missouri Valley, Glidden, Ames, Keystone, Clarence
  • URL: https://www.croptesting.iastate.edu/corn/CornDistrict2.aspx

Results (by yield, all brands)

Rank Company Entry Traits RM Yield Yldp Moist Wyld Eyld Missouri Valley Glidden Ames Keystone Clarence
1 NuTech/G2 Genetics 69C7PCE LL,RR2 PCE 109 259.6 109.3 15.2 237.8 264.1 285.3 218.1 210 287.7 294.6
2 NuTech/G2 Genetics 69B5V LL,RR2 VE 109 256 107.7 15.1 227.9 254.7 286.9 223.2 173.7 304.7 285.7
3 NuTech/G2 Genetics 68C1V LL,RR2 VE 108 248.8 104.7 14.9 232 248.3 280.5 212.5 202.9 269.7 272.2
4 Prairie Hybrid Seeds 6755 - 110 247.5 104.2 14.8 223.9 248.7 271.5 223.9 176.4 284.3 285.3
5 Pioneer P0924Q LL,RR2 Qrome 109 246.7 103.9 15.9 225.8 245.8 282.8 218.4 176.1 279.5 281.6
6 NuTech/G2 Genetics 68A9AM LL,RR2 AM 108 244.7 103 14.8 224.2 249 268.3 208 196.4 279.7 270.9
7 Cornelius Seed C6713DP RR2 VT2P 107 243.8 102.6 14.5 235.7 231.6 275.4 237.1 194.8 228 272.2
8 Epley Brothers Hybrids E1540 - 105 243.2 102.4 13.5 214.5 257 224.7 219.3 199.4 299.2 272.3
9 Prairie Hybrid Seeds 4991Org - 106 240.8 101.3 13.7 229.2 236.2 273.4 228.6 185.6 252 270.9
10 Latham LH 5906 PCE LL,RR2 PC-RIB 109 239.6 100.9 14.7 226.2 241.6 262.9 213.9 201.9 247.6 275.2
11 NuTech/G2 Genetics 65B8V LL,RR2 VE 105 239.5 100.8 13.8 226.5 233.8 274.2 212.5 192.7 240.3 268.4
12 Dekalb DKC104-08VT4PRIB LL,RR2 VT4P-RIB 104 239.4 100.8 13.3 238.7 230.6 271.5 230.5 213.9 221.9 255.9
13 Renk RK705VT4P RR2 VT4P 105 239.1 100.6 13.7 233.9 231.7 263.5 239.4 198.9 227.8 268.5
14 Renk RK785PCE LL,RR2 PC 109 239.1 100.6 14.2 222.5 236.7 279.9 216.2 171.4 244.6 294.2
15 Latham LH 5226 PCE LL,RR2 PC-RIB 102 238.3 100.3 13.2 224.8 234.9 268.1 215.7 190.4 230.8 283.3
16 NuTech/G2 Genetics 66D1AM LL,RR2 AM 106 238.1 100.2 13.6 217 234.3 273.7 209.7 167.7 254.2 281.2
17 NuTech/G2 Genetics 66C2V LL,RR2 VE 106 238 100.2 14.1 225.9 234.6 263.3 228 186.4 245.6 272
18 Viking/Blue River 75-07 - 107 237.4 99.9 13.8 219.5 237.5 251 219.7 188 257.4 267.3
19 Cornelius Seed C6645PC LL,RR2 PC 106 235.8 99.3 13.9 215.5 233.5 266.5 210.5 169.7 246.5 284.4
20 Dyna-Gro D49PN05RA LL,RR2 PC-RIB 109 235.7 99.2 14.8 216.2 234.6 256.5 212.7 179.2 251 273.6
21 Dekalb DKC108-17TRERIB LL,RR2 TRE-RIB 108 235.6 99.2 14.9 222.5 228.7 269.9 225.4 172.1 229.1 285
22 Prairie Hybrid Seeds 4885 - 107 235.1 99 13.9 217.8 232.7 270.6 204.9 178 246.4 273.9
23 Latham LH 5815 VT2 PRO RR2 VT2P-RIB 108 234.5 98.7 15.5 213.9 235.6 247.9 212.4 181.3 254.4 271.2
24 Prairie Hybrid Seeds 5851 - 109 233 98.1 14.9 207.7 240.7 232.9 208.6 181.5 258.5 282.2
25 Cornelius Seed C6936SS LL,RR2 SS 109 232.2 97.8 15.4 217.3 229 254.2 222.2 175.5 239.1 272.4
26 Dyna-Gro D44PN25RA LL,RR2 PC-RIB 104 231.7 97.5 12.9 225.4 226.9 254.6 221.3 200.2 214.2 266.3
27 Pioneer P0529Q LL,RR2 Qrome 105 231 97.3 13.6 209.2 229.2 266.3 204.4 157 252.2 278.3
28 Renk RK773TRE RR2 TRE-RIB 109 231 97.2 14.9 222.6 220.6 267.3 224.5 176 212 273.6
29 Renk RK766SSPRO LL,RR2 SSP-RIB 109 230.6 97.1 14.4 225.7 221.1 263.6 229 184.6 216.3 262.4
30 Cornelius Seed C6847TRE RR2 TRE-RIB 108 227.8 95.9 14.6 226.6 216.4 273.6 223.4 183 193.8 272.5
31 Latham LH 5336 PCE LL,RR2 PC-RIB 103 226.1 95.2 13.1 218.7 225 238.9 214.3 202.7 208.8 263.6
32 Latham LH 5556 PCE LL,RR2 PC-RIB 105 223.6 94.1 14.6 209.3 222 262.4 190.8 174.6 227.2 264.3
33 Latham LH 5377 VT2 PRO RR2 VT2P-RIB 103 216.5 91.1 12.5 221.9 199.6 260.5 223.1 182 160.2 256.7

Top 5 by Yield: 69C7PCE (NuTech/G2 Genetics) 259.6, 69B5V (NuTech/G2 Genetics) 256, 68C1V (NuTech/G2 Genetics) 248.8, 6755 (Prairie Hybrid Seeds) 247.5, P0924Q (Pioneer) 246.7.