Response of semi mature slash pinus elliottii var elliottii and loblolly pine pinus taeda plantations to fertilization with nitrogen and phosphorus

Fisher, R.F.; Garbett, W.S.

Soil Science Society of America Journal 44(4): 850-854


ISSN/ISBN: 0361-5995
Accession: 006326662

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Field trials to measure the response of semimature slash pine (P. elliottii var. elliottii Engelm.) and loblolly pine (P. taeda L.) in the southeastern USA lower coastal plain were established between 1968 and 1970 at 32 locations. Treatments consisted of N at 0, 55, 110 and 220 kg/ha, and P at 0 and 55 kg/ha in a complete factorial arrangement. Grouping sites on the basis of soil drainage class and depth to and nature of the B horizon served as an efficient way to interpret response to fertilization. After 8 yr stands on most soils exhibited moderate to large volume gains when fertilized with N and P. Stands on wet soils with clay near the surface responded favorably to the addition of P alone.