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Researchers nudge corn planting date recommendations for Iowa

Agriculture.com Staff 11/30/2015 @ 4:33pm

Getting corn in the ground when soil temperatures are at or nearest 50 degrees Fahrenheit is fairly common knowledge in the Corn Belt.

But, the results of a recent study from a team of Iowa State University (ISU) Extension agronomists shows the ideal planting windows have changed a bit in that state in recent years. The new data's based on 3 years at 7 field locations each year (2006, 2007 and 2008).

The study's results give date ranges based on maximum yield potential resulting from a range of soil temperatures, centering around the 50-degree mark.

"Corn will not germinate below a soil temperature of 50 degrees Fahrenheit, although seeds absorb water irrespective of temperature. Therefore, growers should plant when the soils are at or quickly approaching 50 to avoid seed rot, poor emergence and/or poor stand establishment," according to ISU agronomists and study leaders Roger Elmore and Lori Abendroth. Although planting too early can cause negative repercussions, in general, planting significantly after the recommended window has greater risk and potential loss for the grower."

The new research shows 3 distinct zones for Iowa, each with slightly different optimal planting windows. In the northeast 1/3 of the state, the study shows farmers have the narrowest timeframe for getting their crop in the ground. That's because of the tighter transition between seasonal weather patterns, the argonomists say.

"Grain yields begin to drop off more significantly here than the rest of the state if plantings are too late. We recommend planting between April 12 and May 2 (95-100% yield window) or between April 12 and 30 (98-100% yield window). The dataset is limited for plantings before April 12 in this region, which limits our ability to make recommendations prior to this date," according to Elmore and Abendroth.

In the northwestern and central part of Iowa, planting date has historically had a lesser effect on yields, therefore farmers have a wider window. Planting between April 15 and May 18 will net farmers a yield potential between 95% and 100%, Elmore and Abendroth say. In the southern third of the state, temperature is even a smaller factor, leaving the planting window even wider, from April 11 to May 13.

"The yield response in this part of the state is presumably related more closely to rainfall patterns and soil moisture than the length of the growing season since this typically is not a limitation as it is in the northern part of the state," according to the ISU agronomists.

Getting corn in the ground when soil temperatures are at or nearest 50 degrees Fahrenheit is fairly common knowledge in the Corn Belt.

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