Browsing Journal of Range Management, Volume 31, Number 4 (July 1978) by Subjects
Now showing items 1-2 of 2
Effects of Summer Weather Modification (Irrigation) in Festuca idahoensis-Agropyron spicatum GrasslandsA simulated summer cloud seeding program was conducted for 4 years on a Festuca idahoensis-Agropyron spicatum grassland. Production and phenologic responses were essentially nil when plots were given 1.1, 1.2, 1.4 times natural rainfall on a per storm basis by sprinkler irrigation. Watering at the rate of 5 cm/week extended the flowering period in only one species, Tragopogon dubius; extended the green leaf season in most species; and increased the production of only three species, Festuca idahoensis, Balsamorhiza sagittata, and Tragopogon dubius. The increased production occurred only in the year following irrigation and may have been due to increased plant reserves and vigor. It appears that summer cloud seeding programs will have little or no positive effect on production in this vegetation type.
Forest Grazing in the SouthPotential forage production is higher in the South than in other range areas of the United States, although actual production is declining rapidly due to accelerated pine regeneration. The cutover longleaf (Pinus palustris Mill.) pinelands that produced an abundance of forage have been largely regenerated with fast-growing slash (P. elliottii Engelm.) and loblolly pines (P. taeda L.) and these young plantations reduce herbage production drastically within a few years. Few large industrial timber companies encourage grazing, although some allow it, often without fee, as a public relations gesture. Cattlemen who depend on forest range alone seldom own the land their cattle graze, often lease the land under an annual permit, and have little incentive to improve the range. Attempts to promote cooperation among livestock producers through grazing associations have generally been unsuccessful. Public land managers are under pressure from wildlife and environmental organizations to prohibit or curtail grazing. Operational-scale multiple-use research is needed to evaluate compatibility of cattle, wildlife, and other resources.