Abstract
Abstract A thinning and fertilizing study was established in an 11-year-old loblolly pine (Pinus taeda L.) plantation. Half of the plots were row thinned, removing 50 percent of the trees; plots were split and half were fertilized at a per acre rate of 100 pounds nitrogen, 50 pounds phosphorous and 50 pounds potassium. There was no response of height, d.b.h. or volume growth to fertilizer. Thinning increased diameter growth but decreased volume growth. The trees have shown exceptional growth. At age 17 the height was 49 feet, d.b.h. 7.3 inches and stocking 2,490 cubic feet on the thinned plots. The respective values for the unthinned plots were 48 feet, 6.7 inches, and 3,960 cubic feet.
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