The Relation of Leaf Size to Root Structure in Trifolium Repens

Abstract

It is shown that restrlction of leaf size may be produced by the mechanical operation of cutting or crushing the leaf. These actions interfere with the nutrition of the root, thus affecting root range. A restricted root range results in a limited water supply, which automatically produces a smaller leaf, and consequently a smaller area of transpiration. Direct root-pruning produces the same phenomenon. Soil acidity may occur throughout the whole of the soil, or in strata. When acidity restricts root development, leaf size is also reduced, in proportion to the degree of root restriction.