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Core Aerator or Pull Behind Drum Spike Aerator
Chief, as you may guess we use these things pretty regularly.
There are two main differences between the two main types. The Spike type merely opens a passage by brute force and the Core type of aerators actually remove some soil. There are pro's and con's to each type, mostly it is the particular application that dictates which is best to use.
If you have very heavy soil and want to lighten it up, or only want to aerate periodically, you will want to extract a plug using a Core type.
If you have light sandy soil, or you can mange to do it fairly often, the spike type will work just fine.
Now to complicate things just a little, there is a new hybrid which has come out and is really catching on lately called a Slit type, they run a knife-like blade. The twist, literally, is that the blade is twisted just slightly, and the resistance of the soil to it's penetration causes the blade to untwist. This twisting & untwisting causes the soil to fracture quite deeply. This is both very good for the roots, but will break up the soil much deeper than either of the other two types above. They are particulary good for sports fields because of the tremendous increase in 'sponginess' which they create in the turf, this goes a long way to preventing injuries in athletes, two legged and four.
The other factor is if you have really heavy soil and want to lighten it up. If you do then regular aerating and spreading of sand is called for. In this case you would more likely want to go with a slit or spike type.
My 2 cents (OK, 2.7 cents Canadian) worth.
Best of luck.
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Core Aerator or Pull Behind Drum Spike Aerator
Jim, I'm coming to your bank, mine charges me $1.35Cdn to buy US$1.00 , therefore US$0.01 would be $0.0135, and US$0.02 would be $0.027Cdn (2.7 cents). No?
On the other hand, forget what I said, I like your math better, I'll bring you $1,400Cdn and you give me US$2,000 back, deal?
MAO, all just in good fun Jim. But that raises the isssue of Metric dollars....
Best of luck.
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