Treesearch

A thorough evaluation of all factors possibly affecting a large-scale planting of eucalyptus is foremost in determining the cost effectiveness of the planned operation. Seven basic areas of concern must be analyzed: 1. Species Selection 2. Site Preparation 3. Planting 4. Weed Control 5. Irrigation 6. Harvest Planning 7. Economics of Co-generation Only after detailed analysis has been completed, can the decision to move forward with major capital expenditures be made. Present pay-back is marginal depending on cost of installations, operating expenses and "avoidable rate" payments from...

E. grandis is in the fourth generation of selection in southwest Florida. The breeding strategy combines a provenance trial, genetic base population, seedling seed orchard, and progeny test in a single plantation where all families are completely randomized in single-tree plots. That planting configuration closely predicted the magnitude of genetic gain realized through age 2.5 years in a simulated commercial plantation: up to 66 percent gain in tree height, 164 percent gain in stem volume, plus significant gains in stem straightness and freeze tolerance.

A container reforestation system has been researched and developed in Hawaii which results in consistently high survival and growth rates for eucalyptus seedlings. Mean survival of containerized saligna eucalyptus (Eucalyptus saligna Smith) seedlings is 90 percent with a standard deviation of 4. Because transplant shock is minimal, seedlings begin to grow quickly. Mean survival of bare-root saligna eucalyptus seedlings was only 56 percent with a standard deviation of 32, and about 70 percent of the seedlings suffered stem dieback. The containerized system includes the nursery, transport,...

Coppicing of eucalypts saves replanting after harvesting, but plan for coppice before planting seedlings. Select a species that coppices in the planned season of harvest; plan spacing and harvesting methods so that harvesting will not damage stumps; plan coppice management. Best coppice is produced by spring harvest with chain saws, low stumps, no bark or root damage, and no debris left on stumps. Problems are fire hazard, regeneration from seeds, coppice reduction, and killing an unwanted coppice crop.

A method for the in vitro propagation of frost resistant eucalyptus is presented. It was used for the propagation of 2-30 years old trees. This method is presently used for the fast production of mother trees from selected trees.

Eucalyptus globulus ssp. globulus, E. viminalis, E. grandis, and E. camaldulensis were selected as the species of interest in California. Yield data for these species from around the world indicate that wide variation can be expected among species, provenances, sites, and management systems. Large gains in yield can be achieved by careful selection within this wide variation to suit California conditions. Growth characteristics of the eucalypts and distribution of the more important plantation species around the world were also reviewed.

Eucalyptus was thought to be a replacement to oak and other hardwoods for many products. Thousands of acres have been planted and now are in need of management. Management techniques are discussed in context with a coastal stand of approximately 300 acres of mixed aged bluegum. Potential markets are explored.

Automatic discrete sample pumping systems used to monitor water quality should deliver to storage all materials pumped in a given cycle. If they do not, successive samples will be contaminated, a severe problem with highly variable suspended sediment concentrations in small streams. The cross-contamination characteristics of two small commonly used portable pumping samplers are compared to each other and to reference measurements under conditions of sudden and severe changes in suspended sediment concentrations. The pressure-vacuum sampler showed greater cross contamination, especially...