Hello David, We only use the screw in anchors on our trellis structures when they are needed. We have very similar soil types to you here in Northwest New Jersey. Years ago we tried the drive in duck bills and they easily pulled out of the soil and did not work. I just don't think that there is enough surface area under the ground to withstand the force that they must withstand.
I hope that this information is helpful. Best, Kurt Kurt W. Alstede General Manager, Alstede Farms, LLC P.O. Box 278 1 Alstede Farms Lane, Chester, New Jersey 07930 United States of America Tel: 908-879-7189 Fax: 908-879-7815 www.alstedefarms.com -----Original Message----- From: apple-crop [mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of David Kollas Sent: Thursday, March 30, 2017 4:31 PM To: Apple-Crop discussion list Subject: [Apple-Crop] Soil Anchors 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 firstname.lastname@example.org http://virtualorchard.com/mailman/listinfo/apple-crop _______________________________________________ apple-crop mailing list email@example.com http://virtualorchard.com/mailman/listinfo/apple-crop