Abstract
On a silt loam soil in central Louisiana, three cultural treatments were applied to a seedling loblolly pine (
Pinus taeda L.) plantation. The treatments were in a 2 x 2 x 2 factorial design: (1) no fertilization or a broadcast application of 177 kg N/ha and 151 kg P/ha; (2) no herbicides applied or broadcast or spot applications of hexazinone, sulfometuron methyl, or glyphosate herbicides and felling as required to control competing vegetation during the first three growing seasons; and (3) no litter applied or broadcast application of pine litter to form a 10 to 15 cm layer in the first growing season. Through 12 growing seasons, the fertilization or herbicide treatment significantly increascd stand growth (a = 0.05), and these two treatments had an additive effect (no treatments, 209 m
3/ha; fertilization, 328 m
3/ha; herbicide, 280 m
3/ha; fertilization and herbicide, 362 m
3/ha). However, because litter application probably had a minor fertilization effect, the fertilizer and litter combination produced the greatest yield (370 m
3/ha). The herbicide and litter combination adversely affected pine survival, and so applying all three treatments was no more effective than fertilization alone. The loblolly pine overstory was the dominant factor influencing the long-term development of the understory.
Citation
Haywood, James D.; Goelz, Jeffery C.; Sword-Sayer, Mary A.; Tiarks, Allan E. 2003. Influence of Fertilization, Weed Control, and Pine Litter on Loblolly Pine Growth and Productivity and Understory Plant Development Through 12 Growing Seasons. Can. J. For. Res. 33: 1974-1982 (2003)