Van Haarlem: "There is nothing against it. We use sod mulch at Vineland. The reason that our growers are not growing nut plantations is that good land, that is good soil, sells for $1,000 per acre. Nut trees grown on poor land, cheap land, do not produce."
McCollum: "I am surprised that rain would not go through loose straw and will go through old straw. Where does the rain go when it falls on the loose straw?"
Van Haarlem: "It is absorbed before it gets through the straw. Dry mulch should be 18 inches deep."
Member: "How would you prevent erosion on rolling land?"
Van Haarlem: "Plant on the contour."
Dr. Crane: "How often do you renew mulch under trees?"
Van Haarlem: "After first application additional may be needed but after that enough is grown under trees which when cut and raked will suffice."