David, we use duckbills or manta rays exclusively here in the sandy loam soils
of Leelanau County because of high failure rate
With helicals in sand. I like the ductile 11" manta ray for apples and the 6"
inch aluminum or ductile for rocky soil in grapes. Whenever we have a helical
fail in an old vineyard a duckbill is used to replace it. Hope this helps.
Kevin J. VerSnyder
Lake Leelanau, MI 49653
> On Mar 30, 2017, at 4:30 PM, David Kollas <kol...@frontier.com> wrote:
> Does anyone have experience with duckbill-type earth anchors for row-ends
> in trellis orchard or vineyard?
> Compacted glacial till is a common feature below about 18-20 inches here.
> I am looking for anchoring against
> possibly as much as 2000 pounds force. Can aluminum duckbills be driven into
> glacial till? Does galvanized cable
> rust out after a few years? Other important observations? I didn’t
> mention that the soils here are abundantly
> supplied with a wide range of stone sizes and types.
> David Kollas
> Kollas Orchard
> Tolland, CT
> apple-crop mailing list
apple-crop mailing list