Home / Crops / Crop Tech / Trying variable rate

Trying variable rate

Jeff Caldwell 05/05/2011 @ 9:51am Multimedia Editor for Agriculture.com and Successful Farming magazine.

Are you using variable-rate seeding or adjusting plant populations in your corn crop this year? Tweaking plant populations is a common approach to getting more bushels out of each acre. But the potential gains of bumping the number of plants per acre aren't always cut and dried, says University of Illinois agronomist Emerson Nafziger.

The seeding rate, Nafziger says, should stay within that 5,000-seed window on either side of the optimal population and, more importantly, should be based on solid yield map data in order to be effective.

“Variable-rate maps will be OK. None will be perfect — the amount you'll be able to swing out of those acres will be minimal,” he says. “Variable rate is pretty dependent on data gathered in a specific year. After-the-fact summaries show correlations, but the predictive ability remains limited.”

If you are variable-rate planting this year, make sure you use more than one year's worth of plant population maps, especially in areas that faced extreme weather conditions in 2010.

“We have to use common sense with these things — not just the data,” Nafziger says.

“Since many planters can do variable rate and farmers want to use it, they will. The best bet is to set a mid-range population based on response data and economics. From this base, change populations by 800 to 1,000 plants per acre for each 10 bushels in change you expect in yield,” he says.

CancelPost Comment
MORE FROM JEFF CALDWELL more +

Senate OKs Section 179 Deduction; Act… By: 12/17/2014 @ 9:45am With just shy of 2 weeks left until the end of the year, Congress has finally made it official: The…

3 Things to Watch This Morning, Wednesday… By: 12/17/2014 @ 6:17am Watch for higher corn and wheat prices today. Overnight trading has corn and wheat futures trending…

Russia Blocks Wheat Exports As Recession… By: 12/16/2014 @ 5:14pm While crude oil's nosedive has gotten most all of the attention in the last few weeks in terms…

MEDIA CENTERmore +
This container should display a .swf file. If not, you may need to upgrade your Flash player.
The Future of Livestock Production
Agriculture.com

FREE MEMBERSHIP!

CLOSE [X]