As part of a pasture renovation project I decided to tackle surface compaction first and had access to an Aerway which is designed for that purpose.
I am in the midst of a 3 years pasture renovation project. The last two years of work came to naught so now entering my third year and am going to run a vertical tillage tool, reseed it to cool season grass and keep the cows off.
Borrowed an Aerway vertical tillage tool from a neighbor Frankie Charipar who lives right north of Leigh, Neb. He is a big fan of the Aerway and has 15 foot and 20 foot units with Phoenix rolling harrows attached behind.
Since I have tested a number of other vertical tillage tools that include some coulters, harrows and rolling baskets I figured I should test the Aerway and especially since I have a compaction problem.
Few basic points first. The Aerway is a vertical tillage tool manufactured by Aerway in Norwich, Ontario. Its’ main function is to process residue and fracture the soil and can be considered a vertical tillage tool. This design is popular in the turf industry. Some folks call it an oxygen pump.
The Aerway has four slightly twisted blades on a shaft that are 8 inches long and 7.5 inches apart. The blades, called shattertines twist as they roll through the soil leaving a small pocket. As the shatter tines rotate, they twist as they come out of the soil fracturing any compaction. Under normal dry working conditions the soil caves back into the pocket and don’t leave a void.
The Aerway gangs can be set to run at five angles, 0, 2.5, 5.0, 7.5, and 10 degrees. The greater the angle the more aggressive the action, the more soil moved and the harder it pulls. Aerways need sufficient ballasting (weight) to get the shattertines to penetrate to the hub, it needs to run level or parallel to the soil surface and speed is important probably around 8 mph – similar to other vertical tillage tools.
So yesterday I ran the Aerway on this pasture. It was sprayed Sunday with 2,4-D to kill off the broadleaf weeds. My goal is run an Aerway then seed with a grass and millet mix. I am pulling a 15-foot Aerway with attached rolling harrow with a 140 hp John Deere 4440 and I ran it at all five gang angles and made the following observations.
I lacked the horsepower to pull the unit at 8 mph but perhaps at the 0 degree gang angle where action was very limited. The soil, though fit for working was compacted and made pulling harder. However I could pull it at 6 mph at 2.5 degree and perhaps 5 degrees but at 7.5 degrees I was down to 4 to 5 mph and at 10 degrees, it was too much for the tractor to handle and the engine temperature was creeping up.
Good action is not just to process the residue but also to penetrate and fracture the soil profile
The unit should be ballasted to penetrate all the way to the hub, about 7 to 8 inches. However the soil in that field was so compacted that ballast (four 250 lb cement blocks) wasn't sufficient.
The greater the gang angle the more soil is turned and exposed, in other words the greater the action
The greater the compaction the harder it pulled and it would actually bog the tractor down
Pockets created by the shattertines did cave back in when the blades exited the soil
The rolling harrow leveled the field and fluffed up any residue
The absence of the rolling basket meant clods weren’t broken down. However soil conditions were fit and clods were few
Company recommends 8 to 10 hp per foot of width but the requirement depends both on the terrain steepness, soil compaction and number of attachments behind. In my situation will hills and compaction, it might require 12 hp per foot to run at depth, at angle and speed.
I understand now how the Aerway fractures compaction while processing residue and leveling the soil surface. I plan to continue testing it on the pasture, grass hay field and then on corn and soybean stubble this fall. But I need another 25 hp (maybe a 4640 with 165 hp) to do the job right and probably at 5 degrees gang angle.