Growth and survival of Pinus taeda in response to surface and subsurface tillage in the southeastern United States

摘要: Abstract A trial series investigating the impact of surface and subsurface tillage on survival growth planted Pinus taeda L. was established between 1994 1998 with goal identifying site types responsive to tillage. The consisted 15 studies multiple replicates a 2 × 2 factorial (offset disking or opposed bedding) (winged subsoiling shank) Subsurface significantly improved at four sites one site. positive response associated Piedmont where from 74 82%. Surface height, diameter volume being greatest soils siliceous mineralogy, which showed an improvement 5.1 m3 ha−1 6 years. less for kaolinitic mineralogy (4.0 m3 ha−1) those mixed (3.1 m3 ha−1). Initially due However, short lived had dissipated by year 6. Effects stand uniformity were negligible. In general, responses relatively small compared that can be obtained other silvicultural practices such as vegetation control fertilization.