William Yarley

William Yarley

Carryover Effects of Fertilizer and Weed Control Treatments on Soil Nutrients and Organic Carbon and Nitrogen in Southeastern Pine Stands


William J. Yarley, Jason G. Vogel


Dr. Jason Vogel


College of Agricultural and Life Sciences


Two randomized, complete block design experiments were established in Pinus taeda L. stands in north Florida to understand the carryover effects of intensive management practices on soil nutrients and organic carbon and nitrogen. One of the experiments had the same treatments as in its first rotation (control [C], fertilizer [F], weed control [W], and fertilizer and weed control [FW]). The second experiment was untreated (carryover [C]; CC, CF, CW, and CFW) in its second rotation. Soil extractable nutrients (P, K, Ca, Mg, Mn, Cu, Zn) and concentrations of C and N were examined. In the carryover plots, Cu (p=0.001) and Zn (p=0.01) were significantly greater in CF and CFW plots. In the actively treated plots, only Cu (p=0.4) was significantly greater in F and FW plots, though the active treatment plots showed substantial variability. Weed control alone did not display any significant impact. These results suggest that past intensive silviculture has little discernible effect on soil 0-20 cm deep in the current rotation and that soil characteristics are resistant to silvicultural activities.


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