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Nine Years of Growth Following Fertilizer Application to A 9-Year-Old Slash Pine Plantation

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Abstract:

In 1964 a fertilizer experiment using three levels of nitrogen (0, 40 and 120 lbs./acre N) and three levels of phosphorus (0, 18 and 53 lbs./acre P) was laid out as a randomized block experiment in a 9-year-old slash pine plantation. Three separate covariance analyses on individual tree measurements are presented, with d.b.h., height, and merchantable volume as the response variables, and with the initial (1964) value for each as the covariate. The effect of N or P alone on the 9-year growth of each response variable was insignificant compared to the response obtained with N and P combined at the highest level of each. At this level there were 50-percent, 12-percent and 18-percent increases in average tree volume, average tree height, and average tree d.b.h., respectively. Percent increase in average tree size leveled off about five years after application, but the absolute difference continued to increase throughout the 9-year measurement period. This increase is estimated to result in $198/acre additional revenue over an 11-year period following application.

Document Type: Journal Article

Affiliations: Group leader, Woodlands Division, Union Camp Corporation, Rincon, Georgia

Publication date: November 1, 1978

More about this publication?
  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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