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Yield-Nutrient Concentration Relationships in Slash and Loblolly Pine Seedlings¹

ABSTRACT

Relationships between dry matter yields and concentrations of P and K were studied in slash pine (Pinus elliottii Engelm.) and loblolly pine (Pinus taeda L.) seedlings grown in greenhouse pot experiments comparing fertilizer rates and sources. The purpose was to determine if minimum and critical nutrient concentrations in pines could be determined more accurately in pot experiments than from field sampling or from very short-term solution or sand culture studies.

Growth of these species of pine seedlings for 6 to 12 months was found necessary to establish minimum plant P and K concentrations. Values which permitted continuing growth of slash and loblolly pines were about 0.07% P and 0.10% K, which were essentially the same in both the needles and the entire tops of 6- to 8-month-old seedlings. Concentrations of N, P, and Ca in seedlings for which growth was not limited by these nutrients were higher in needles than in the entire tops. Critical concentrations could not be established accurately from the results obtained.

¹ Contribution from the Soils and Fertilizer Research Branch, National Fertilizer Dev. Center, TVA, Muscle Shoals, Alabama 35660.

² Agronomist and Research Forester, respectively.

Received for publication November 1, 1972. Accepted for publication January 26, 1973.