Response of Slash Pine to Different Spacings and Site-Preparation Treatments
Abstract Seventeen years after installation, an experiment testing the effect of spacing and four site-preparation treatments yielded data on growth, volume, disease incidence, and survival of slash pine (Pinus elliottii var. elliotti Engelm.) Across all spacings and treatments, growth and yield were generally greater on better drained soils. Spacing had a decided effect on growth and volume: wider spacings resulted in greater d.b.h. but reduced volume; the closer the spacing, the more merchantable volume was produced; 6' x 12' spacing seems the most acceptable compromise. Site-preparation methods had a visible effect on disease incidence and survival: burn-bedding and burn-harrowing enhanced growth and increased volume yield and survival; burn-scalping proved detrimental. Although stem canker infection was higher on intensively prepared plots, they produced the greatest wood yield.