Trellis Orchard Planning Tool

A study led by Dr. Peter Havard, P.Eng indicated that the strength of the trellis system was affected by a number of factors, including soil properties, structural design and orchard properties. The key factors in the strength of support systems include material selection, installation practices and system maintenance. Installing posts below the frost depth reduces heaving and overall resistance to soil failure by overturning of the trellis. Lab testing showed that the addition of soil cement, lime and stabilizers around the post base would significantly increase the soil resistance to overturning post failure. It was noted that outer trellis rows are more directly exposed to the highest wind loads should consider having closer post spacing or soil amendments to reduce the burden on each post. A trellis design evaluation tool was developed to aid in planning new system.