Root System Considerations in the Quality of Loblolly Pine Seedlings

Abstract

Abstract A series of studies was carried out to determine quantitative relationships between root system quality parameters and ability to take up water, and expand the root system into adjacent soil. Root system size, described by displacement of water (i.e., root volume), determines the potential for water uptake prior to new root growth. Seedlings of comparatively high root volume also have superior root growth potential (RGP). After new root growth, the potential for water uptake is proportional to the number of new roots produced. The beginning of rapid root growth after planting is dependent on soil temperature. Root growth potential rank of open-pollinated families can change with soil temperature, which also alters RGP within family. Nursery practices that favor production of seedlings with high root volume and high RGP will increase the quality of seedlings of a given height. South. J. Appl. For. 10:87-92, May 1986.