1989 journal article

SUBSOILING IN A LOBLOLLY-PINE SEED ORCHARD - EFFECTS ON SEED QUALITY

CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE, 19(4), 505–508.

By: D. Struve, J. Jett*, S. Mckeand*  & G. Cannon

topics (OpenAlex): Seed Germination and Physiology; Tree Root and Stability Studies; Forest ecology and management
TL;DR: An 8-year-old loblolly pine (Pinustaeda L.) seed orchard was subsoiled by making one or three parallel rips on opposite sides of the trees and strong clonal effects in seed quality and vigor occurred. (via Semantic Scholar)
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An 8-year-old loblolly pine (Pinustaeda L.) seed orchard was subsoiled by making one (single-rip treatment) or three (multiple-rip treatment) parallel rips on opposite sides of the trees. A nonsubsoil (control) treatment was also included. Seeds were extracted and sized into small, medium, and large. Subsoiling treatments had no effect on number or percentage of small, medium, and large seeds. The multiple-rip treatment produced significantly more seeds per cone than the control treatment, but no more than the single-rip treatment. Seed size did not affect seed germination, but strong clonal effects in seed quality and vigor occurred. There was no effect of any of the subsoiling treatments on seed germination. Any subsoiling treatments used to enhance tree vigor or to alleviate soil compaction in a seed orchard should have minimal influence on seed quality.