Browsing Journal of Range Management, Volume 22, Number 4 (July 1969) by Title
Now showing items 8-18 of 18
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Influence of Age and Awn Removal on Dormancy of Medusahead (Taeniatherum asperum) SeedsThe effects of seed age and awn removal were studied in two medusahead strains having different post-maturity seed dormancy characteristics. Awn removal increased the percentage germination. The proximity of removed awns inhibited the germination of deawned seeds. Dormancy of intact seeds and inhibitory effects of awns decreased with increasing age of seeds.
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Interseeding Sideoats Grama on the Texas High PlainsSideoats grama was interseeded in grass stands representing intermediate stages of succession near Amarillo, Texas. Seedings at 0.5-inch depth were more successful than at one-inch. Addition of 30 lb/acre nitrogen fertilizer or legume (alfalfa) to the seeding did not increase the seedling establishment. Better grass stands with less competition from non-seeded species was obtained from seeding in late May than in March, April, or June. Highest total survival of grass seedlings was also from the May seedings.
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Is Deferment Always Needed After Chemical Control of Sagebrush?The effects of 0, 1, 2, and 3 years of grazing deferment after sagebrush control were compared on subalpine ranges of the Big Horn Mountains in Wyoming. On units open to grazing, utilization of Idaho fescue was generally below the level which sustains yield under season-long grazing. Under such conditions, the desirable forage grasses quickly increased in vigor and revegetated the area after sagebrush was killed. Continued moderate utilization did not retard the revegetation process or influence the subsequent reinvasion of sagebrush.
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Journal of Range Management, Volume 22, Number 4 (July 1969)Society for Range Management, 1969-07-01
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Nature and Successional Status of Western Juniper Vegetation in IdahoWestern juniper invasion of sagebrush-bunchgrass vegetation in southwestern Idaho was verified. The invasion started about 1860 and is continuing at present. Juniper was found to be climax on rocky ridges and rimrocks where soil development is limited. Seral juniper stands were found on the deeper soils of valley slopes and bottoms. These sites were previously occupied by productive sagebrush-grass stands. It appears that juniper control would be more beneficial on invaded sites than on climax juniper sites.
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Plant Response and Cattle Gains on Sherman Big BluegrassUnder season-long grazing of Sherman big bluegrass, utilization to a 4-inch stubble height was better than lighter or heavier grazing for sustained forage production and ground cover. Heavy grazing associated with drought resulted in severe deterioration of the grass stands. Beef gains from the recommended rate of grazing averaged 78 lb/acre. This beef gain was higher than for any other seeded or native species tested at the Manitou Experimental Forest, Colorado.
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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.
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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.
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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.
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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.
