Fertilization and Irrigation Stimulate Flowering and Cone Production In a Loblolly Pine Seed Orchard
Fertilizer and water were applied in a loblolly pine (Pinus taeda L.) seed orchard to evaluate the effects on female flower and cone production. Treatments were (1) control; (2) fertilized with approximately 300 kg/ha N, 25 kg/ha P, and 47 kg/ha K; (3) irrigated through the growing season; (4) fertilized and irrigated. Treatments have been imposed annually since orchard establishment in 1963. Average female flower production per tree for 1968-1970 and number of cones per tree for 1968-1975 were increased by fertilization, by irrigation, and by the combination of fertilization plus irrigation. Flower and cone production as well as responses to the treatments varied widely among clones. The treatments caused changes in soil acidity, organic matter, and available P, K, Ca, and Mg.
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Document Type: Journal Article
Affiliations: Professor, Department of Forestry, North Carolina State University, Raleigh
Publication date: 1982-02-01
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