Late Planting Guidelines
Ellen Phillips, Extension Educator, Countryside Extension
Center, 708-352-0109, ephillps@uiuc.edu
The Illinois Agronomy Handbook provides the following guidelines
for late planting. Below are estimated yield losses for corn and
soybeans if planting is delayed.
Corn
| May 1 to May 10 |
1/2 bushel yield loss per day of delay |
| May 11 to May 20 |
1 bushel yield loss per day of delay |
| May 21 to May 30 |
1 1/2 bushel yield loss per day of delay |
| After May 30 |
about 2 bushels yield loss per day |
| June 10 |
3 bushels yield loss per day |
Soybeans
Planting in the first half of May generally results in the best
yield. Delaying planting beyond the middle of May results in decreased
yields, and at an ever-increasing rate as the calendar date gets
later. By the end of June, yield potential drops to roughly 50 percent
to 60 percent of what could have been obtained with timely May seeding.
While delayed planting reduces soybean yield potential; the yield
penalty for late-planted soybeans is not as great as that for
corn. For late-planted soybeans, consider the following.
- Use Mid to Full Season Variety
-delayed planted fields do not need an earlier maturing soybean
variety. Generally, for each 2 to 3 day delay in seeding beyond
the optimum planting period only a 1-day delay in maturity will
result for the same variety.
- Use Narrow Rows
-results in maximum sunlight interception in a shorter time
- Increase Seeding Rate
- planting delayed to June 10, increase seeding rate by
10 to 15 percent
- planting delayed to June 20, increase seeding rate by
20 to 30 percent
- planting delayed to July 1, increase seeding rate by 50
percent
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