Nitrogen and Potassium Fertilization Of Loblolly Pine on a South Carolina Piedmont Soil
Abstract:Potassium fertilizer at the rate of 120 and 240 lb K per acre was applied to 7-year-old, slow-growing loblolly pine (Pinus taeda L.) in the South Carolina Piedmont. Treatment increased foliar K from about 0.25 percent to 0.50 percent but did not affect growth. Two years after fertilization with nitrogen at 200 lb per acre, height and diameter growth rate had increased 25 percent and 35 percent, respectively. Nitrogen percentage in the needles and needle weight were also increased. Interactions between position on the slope, nitrogen percentage in needles, and growth were indicated. Potassium fertilization decreased Ca and Mg concentrations in needles, whereas N decreased P, Ca, Mg, Mn, Zn, and Al. The effects were not sufficiently great to cause a deficiency or imbalance in nutrition. Forest Sci. 16: 172-176.
Document Type: Journal Article
Affiliations: Principal Soil Scientist, Forestry Sciences Laboratory, Southeastern Forest Exp Sta., Forest Service, U.S. Dep. of Agr., Research Triangle Park, N. C. 27709
Publication date: 1970-06-01
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