INTEGRATION OF NURSERY PRACTICES AND VEGETATION MANAGEMENT - ECONOMICAND BIOLOGICAL POTENTIAL FOR IMPROVING REGENERATION

Researchers in New Zealand, Scotland, South Africa, Texas, and Alabama provided data on growth responses owing to nursery management practic es and weed control after outplanting. Nursery treatments included nit rogen fertilization (0 vs. 168 kg/ha), seedling grades (small-diameter vs. large-diameter seedlings), and a comparison of stock types. Weed- control treatments varied by study and included broadcast and spot app lications. Interactions between nursery practices and weed control wer e examined. Regardless of location, growth (2-8 years after planting) was increased as seedling diameter increased. Practices that increase average seedling diameter in the nursery are typically less costly tha n silvicultural practices required to obtain similar growth responses from small-diameter stock. Although interactions were observed among s ites, stock size, and intensity of weed control, large-diameter stock consistently grew better than small-diameter stock regardless of site or site-preparation method. Thus, increasing the investment of regener ation expenditures at the nursery, relative to that put into site prep aration, will substantially improve financial returns on investment. F urther research needs in this area are also discussed.