Abstract
Core Ideas Planting in mid‐May can significantly diminish Iowa maize grain yields. Grain yield variability is explained mostly by planting date with minor effect from relative maturity. Silking date is a good indicator of grain yield; silking beyond 25 July was detrimental. Unfavorable weather conditions frequently cause farmers to plant maize ( Zea mays L.) outside the optimum planting timeframe. We analyzed maize yield and phenology from a multi‐location, year, hybrid relative maturity, and planting date experiment performed in Iowa, USA. Our objectives were to determine the optimum combination of planting date and relative maturity to maximize maize grain yield per environment and to elucidate the risk associated with the use of “full‐season hybrids” when planting occurs beyond the optimum planting date. Analysis of variance (ANOVA) attributed 70% of the variability in grain yield to planting date and only 10% to relative maturity indicating that short and full‐season hybrid relative maturities produced similar grain yields regardless of when they were planted as long as the crops reached maturity before harvesting. Our analysis indicated time to silking is a good indication of expected yield potential with a critical time (beyond which yield is reduced) to be 23 July for Iowa. Furthermore, we found that a minimum growing degree accumulation of 648°C‐day during the grain‐filling period maximized maize yield. Overall, this study brings new results to assist decision making regarding planting date by hybrid relative maturity across Iowa.
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Claims 8
Claim · model-written summary
Planting in mid-May significantly diminished maize grain yields in Iowa.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting in mid‐May can significantly diminish Iowa maize grain yields”
Claim · model-written summary
Planting date accounted for 70% of the variability in maize grain yield.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We analyzed maize yield and phenology from a multi‐location, year, hybrid relative maturity, and planting date experiment performed in Iowa, USA”
e1“Analysis of variance (ANOVA) attributed 70% of the variability in grain yield to planting date and only 10% to relative maturity”
Claim · model-written summary
Relative maturity accounted for 10% of the variability in maize grain yield.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We analyzed maize yield and phenology from a multi‐location, year, hybrid relative maturity, and planting date experiment performed in Iowa, USA”
e1“Analysis of variance (ANOVA) attributed 70% of the variability in grain yield to planting date and only 10% to relative maturity”
Claim · model-written summary
Short and full-season hybrid relative maturities produced similar maize grain yields regardless of planting date when the crops reached maturity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We analyzed maize yield and phenology from a multi‐location, year, hybrid relative maturity, and planting date experiment performed in Iowa, USA”
e1“short and full‐season hybrid relative maturities produced similar grain yields regardless of when they were planted”
Claim · model-written summary
Time to silking is a good indication of expected maize yield potential in Iowa.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We analyzed maize yield and phenology from a multi‐location, year, hybrid relative maturity, and planting date experiment performed in Iowa, USA”
e1“Our analysis indicated time to silking is a good indication of expected yield potential with a critical time (beyond which yield is reduced) to be 23 July for Iowa”
Claim · model-written summary
The critical time for maize in Iowa was 23 July, beyond which yield is reduced.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We analyzed maize yield and phenology from a multi‐location, year, hybrid relative maturity, and planting date experiment performed in Iowa, USA”
e1“Our analysis indicated time to silking is a good indication of expected yield potential with a critical time (beyond which yield is reduced) to be 23 July for Iowa”
Claim · model-written summary
Silking beyond 25 July was detrimental to maize yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting in mid‐May can significantly diminish Iowa maize grain yields”
e1“silking beyond 25 July was detrimental”
Claim · model-written summary
A minimum growing degree accumulation of 648°C-day during the grain-filling period maximized maize yield.
- Organ / stage
- grain‐filling periode0
- Treatment
- minimum growing degree accumulatione0
- Outcome
- maize yielde0
- Direction
- maximizede0
- Value
- 648°C‐daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a minimum growing degree accumulation of 648°C‐day during the grain‐filling period maximized maize yield”
The same questions in other papers
sowing time · yield · Zea mays (maize)Positive and negative results
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- positive
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See all 269 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.