Strip-till vs. planter attachments
Many corn growers question their tillage and planting systems from time to time. Bishop Mumford, Griffin, Indiana, is one such grower. Mumford has no-tilled most of his corn for the past 15 years. For several years, he used nothing but coulters and residue wheels. Now, however, he has several attachments on his planter.
"It didn't really come together for me until I added Case IH gauge wheel tires, Keeton seed firmers, spiked closing wheels, and chains," he says.
Although Mumford likes his current setup, he wonders if his soil would warm up and dry out more quickly with fall strip-till. That's why he posted the question at the top of the page in a talk group at Agriculture Online(tm), where it sparked a discussion among other growers. We've included some of their comments, along with comments from other growers, in this story comparing fall strip-till to using attachments on the planter to clear a strip in which to plant.
There are many approaches to strip-till. One of the most common involves using a smooth coulter, anhydrous ammonia shank with a mole knife, and oversize closing disks to place anhydrous ammonia and/or phosphate and potassium 6 to 8 inches deep. This setup builds a mound to plant into the following spring.
Likewise, there are a lot of different types of planter attachments to clear residue and lightly till a strip of soil to plant into. Residue wheels are almost standard equipment on many no-till planters. They're often run in combination with no-till coulters.
More recently, no-tillers who frequently plant into wet soil have added spiked closing wheels in an attempt to eliminate sidewall smearing in the furrow and compaction over the row.
A lot of strip-tillers are converts from pure no-till who had experienced poor stands in cold, wet springs. Others, like Darrell Dunahee, Melvin, Illinois, previously field-cultivated bean stubble ahead of planting corn.
"But I saw soil erosion where I ran the field cultivator," he says. "Ever since I was a little boy it's upset me to see soil washing away. I thought there had to be a better solution."
For Dunahee, the solution was fall strip-till, which he adopted nine years ago. "It's not without problems, but basically it works well," he says. "It looks like it is yielding right with conventional tillage. And the thing most people around here like is it plants nicely. The soil is loose and mellow. Generally, you don’t end up with clods or smeary soil."
Two years ago, he bought the strip-till rig shown above and started doing custom work through the Melvin FS plant in addition to his own fields. According to plant manager Mike Moody, FS charges $7.50 for strip-tillage without fertilizer, $11 for strip-tillage with either dry fertilizer or anhydrous ammonia, $13 for strip-tillage with both forms of fertilizer.