Browsing Journal of Range Management, Volume 22, Number 4 (July 1969) by Title
Now showing items 15-18 of 18
Quantitative Assessment of Grazing Behaviour of Sheep in Arid AreasFive indices are suggested to quantify components of spatial distribution of grazing sheep which were observed by aerial photography. Indices based on sheep numbers were more sensitive to environmental changes than those based on distances between sheep. It is suggested that the adjustment takes place by a change in the numbers within independently grazing flocks, while social contact between sheep, as reflected by various nearest-neighbour distances, remains unaltered.
Water Control by Rangeland ManagementIn rangeland management, water quantity and quality are related to range condition. The better the range condition, the better the water relationships. Range condition can be improved by regulating grazing, reseeding, fertilizing, type conversions, and contour furrowing and pitting. Rangelands are highly variable in nearly every respect. The range manager must understand the climatic/topographic/soil/plant/animal/water relationships for the areas under his control; he must have sound management objectives; and he must be willing to work toward those objectives in so far as is economically feasible.
Water Use, Adaptability, and Chemical Composition of Grasses Seeded at High ElevationsSoil moisture depletion varied directly with extent of top and root growth of five grass species seeded on four areas between 6,500 and 8,500 ft in northern Utah. Smooth bromegrass and intermediate wheatgrass had greater root and top growth and used the most moisture at the lower elevation site where temperatures were highest, but timothy and orchardgrass grew best at higher elevations. Timothy contained low levels of nitrogen, phosphorus, and potassium on all sites, whereas tall oatgrass and orchardgrass contained high levels.
Yield of Crested Wheatgrass Following Release from Sagebrush Competition by 2,4-DRate of increase in yield of crested wheatgrass following use of herbicide on associated sagebrush was measured over four years, including the year of treatment. Significant increases in yield, which were probably worthwhile economically, did not begin until the third year after spraying.