Abstract
Growth measurements made on the apple cvs. McIntosh and Quinte grafted on 12 Ottawa rootstock selections were related to 10 measurements of predicting rootstock vigor. Potential vigor was assessed by three calculations of bark percentage in the roots, leaf weight of trees in the nursery or stoolbeds, the wheat growth bioassay, leaf respiration and level of amino nitrogen, and total P and K in the xylem sap of the ungrafted clones. Of the 10 indices, dry weight of the leaves of the ungrafted apple rootstocks growing in the nursery or in stoolbeds was the most satisfactory method of assessing potential early vegetative growth. The ungrafted rootstocks that resulted in most growth control had the largest leaves. Data obtained are discussed in relation to developing a method of selecting rootstocks with size-controlling potential.
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