Paper · 2006 · Iowa State University Digital Repository (Iowa State University)

What's the yield effect of uneven corn heights?

Roger W. Elmore; Lori Abendroth

3
claims
4
verbatim quotes
2
citations
2
research areas
✓
Open access

Abstract

Many corn fields across Iowa had significant variation in plant emergence and early-season growth within fields. Uneven emergence and plant heights are caused by several factors, including variation in soil temperature, seeding depth, residue distribution, soil crusting, and soil moisture, etc. Iowa producers dealt specifically with variable soil temperatures this year, which have now caused variable plant heights and vigor. How much can plant height vary before it causes a real yield loss? And based on this, should we have replanted more? Four percent of Iowa's corn acreage was replanted this year (National Agricultural Statistics Service [NASS], 5 June 2006).

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Claims 3

Observationobservedoriginal resultsignificant (as stated)measured

Claim · model-written summary

Corn fields across Iowa had significant variation in emergence and early growth.

Outcome
plant emergence and early-season growthe0
Setting
Iowae0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Many corn fields across Iowa had significant variation in plant emergence and early-season growth within fields.”

✓ located verbatim in the source · abstract, characters 0–112 · show in text ↑
Mechanismobservedoriginal resultnegativemeasured

Claim · model-written summary

Variable soil temperatures caused variable corn heights and vigor in Iowa.

Outcome
variable plant heights and vigore0
Qualifier
variable soil temperaturese0
Setting
Iowae0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Iowa producers dealt specifically with variable soil temperatures this year, which have now caused variable plant heights and vigor.”

✓ located verbatim in the source · abstract, characters 296–428 · show in text ↑
t0

“corn”

✓ located verbatim in the source · title, characters 34–38 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Four percent of Iowa corn acreage was replanted that year.

Outcome
corn acreage was replantede0
Value
Four percente0
Setting
Iowae0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Four percent of Iowa's corn acreage was replanted this year”

✓ located verbatim in the source · abstract, characters 546–605 · show in text ↑