One of the greatest deterrents to establishing a new nut orchard is the long period of time it takes from tree planting to first commercial nut harvest. At the Pecan Experiment Field, a pecan or walnut must grow ten seasons or more and maybe a little less for Chinese chestnuts before the trees produces enough nuts to warrant mechanical harvesting.
Van Sambeek, Jerry; Reid, William. 2017. A double row alley-cropping system for establishing nut orchards. MNGA (Missouri Nut Growers Association) Newsletter. 17(4): 11-14.