Slash Pine Growth and Response to Fertilizer After Application of Pesticides to the Planting Site
Abstract:Two experiments carried out successively on a west-central Florida Sandhills site evaluated effects of various means of temporary weed and nematode control on growth and response to fertilizer of planted slash pine (Pinus elliottii var. elliottii Engelm.). In an exploratory experiment begun in 1964, seedlings grew strikingly and persistently better in soil fumigated with methyl bromide before planting, showing increases of 29 percent in height and 134 percent in stemwood volume per ha over untreated controls after 13 years. Trees in simazine and hand weeding treatments produced somewhat less growth but substantially more than those in unweeded plots. Response to NPKMgS fertilizer plus lime applied factorially at planting with weeding treatments was statistically insignificant. In a followup experiment, begun 2 years later, growth of slash pine planted following soil injection of Vorlex and D-D was in the order Vorlex > D-D > no soil treatment. Whole-plot fumigation was superior to strip fumigation. Phorate and NKMgS fertilizer applied factorially across soil fumigation treatments also significantly increased tree growth, their effects being more pronounced with the less effective soil fumigation treatments. Foliage analyses indicated that trees in unfumigated, unfertilized plots eventually became K deficient and that soil fumigants enhanced K uptake and delayed onset of deficiency. Nematode assays showed that measurable nematocidal effects of the fumigants persisted less than 6 months. Sequential sampling showed that the endoparasitic pine cystoid nematode (Meloidodera floridensis Chitwood, Hannon & Esser) gradually increased to high levels in the rhizosphere of pine transplants. Assays and trends shown by foliage analysis and tree growth suggest that root depredations by this parasite may contribute to nutrient deficiency and growth decline in slash pine on Sandhills sites, even where appropriate fertilizers have been applied. Forest Sci. 27:487-502.
Document Type: Journal Article
Affiliations: Professor of Nematology, Department of Entomology and Nematology, University of Florida, Gainesville, FL 32611
Publication date: 1981-09-01
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