PRS Publications

Have this publication emailed to you.

Inter-Rotational Effects of Fertilizer and Herbicide Treatments on the Understory Vegetation Community in Juvenile Loblolly Pine (Pinus taeda L.) Stands

Subedi, P., E.J. Jokela and J.G. Vogel. 2017.


Two randomized, complete block design experiments were established in north Florida to examine the inter-rotational effects of fertilization and herbicide applications on understory community responses in 2-year-old Pinus taeda L. stands. One experiment was left untreated (carryover [C]; CC, CF, CW, and CFW) and the second received the same first-rotation treatments - control (C), fertilizer (F), herbicide (W), and fertilizer and weed control (FW)- in the second rotation. In both experiments, herbicide applications alone and when combined with fertilization suppressed woody species such as Ilex glabra (L.) A. Gray and Serenoa repens (W. Bartram) Small (CFW: 0.26; FW: 0.01 Mg ha-1 biomass) but favored graminoids such as Andropogon virginicus L. var. glaucus Hack. and Dichanthelium acuminatum (Sw.) Gould & C.A. Clark (CFW: 3.1; FW: 1.1 Mg ha-1 biomass). Although the CW (0.99) and W (0.99) treatments did not affect understory diversity (H'), the CFW (0.45) and FW (0.5) treatments exhibited reductions compared with the CF (1.24) and F (1.33) treatments, respectively. In both experiments, fertilizer alone did not affect understory composition and diversity compared with the control. These results suggest that intensive additions of either herbicide alone or in combination with fertilization affected understory composition and diversity in the subsequent rotation.

Key Words

sustainability, species richness, diversity, biomass, nutrients