. Protecting and enhancing America's forests and rangelands : 1986 research accomplishments. Forests and forestry United States; Rangelands United States. Loblolly Pine Management Guides Maintaining or improving the productivity of the land is part of the forestry ethic. In the long rotations of traditional forestry, obtaining adequate reproduction after harvests satisfied management's concerns for the future. Now with short rotations and chipping of entire trees, including foliage, soil nutrients may be taken away faster than they have ever been taken before in well- | managed forests. To man
. Protecting and enhancing America's forests and rangelands : 1986 research accomplishments. Forests and forestry United States; Rangelands United States. Loblolly Pine Management Guides Maintaining or improving the productivity of the land is part of the forestry ethic. In the long rotations of traditional forestry, obtaining adequate reproduction after harvests satisfied management's concerns for the future. Now with short rotations and chipping of entire trees, including foliage, soil nutrients may be taken away faster than they have ever been taken before in well- | managed forests. To manage this possible long-term decline in site productivity, a forester must have some understanding of nutrient cycling--the movement of nutrients into, within, and out of forest ecosystems. A new guide, "Foresters' Primer in Nutrient Cycling," provides the sort of information a forest manager needs. It tells the concentrations of nitrogen, phosphorus, and potassium found in various tree parts as the trees age. It gives the quantities | of nutrients that accumulate in the forest beneath loblolly pine and the quantities that break down and pass to mineral soil. It also estimates the nutrient losses associated with prescribed burning and other forms of site preparation. As forest treatments go, fertilizer application is fairly expensive—too expensive to do without assurance of a positive result. The new management guide "When and Where To Apply Fertilizer" tells forest managers about using foliar analysis to determine fertilizer applications, the levels of phosphorus to add to most soils, the greater response to nitrogen on sites where it is limiting but moisture conditions are favorable, and the expected returns of 10 to 28 percent for fertilizer applications on some sites. On poorly drained, heavy soils, logging can destroy soil structure, block drainage, injure seedlings, and remove valuable nutrients. On Coastal Plain sites, as much as two-thirds of a logg
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