Browsing Journal of Range Management, Volume 35, Number 6 (November 1982) by Title
Now showing items 31-33 of 33
Use of Range Shrubs to Meet Nutrient Requirements of Sheep Grazing on Crested Wheatgrass during Fall and Early WinterThis study considered the feasibility of supplementing crested wheatgrass (Agropyron cristatum Fisch.) forage with some common rangeland shrubs. The necessary proportions of shrub and grass in the diet to meet protein and energy requirements were calculated for gestating sheep during the late fall and early winter grazing season. Shrubs studied included fourwing saltbush Atriplex canescens Pursh. Nutt.), winterfat (Ceratoides lanata (Pursh Howell), rubber rabbitbrush (Chrysothamnus nauseosus ssp. albicaulis, (Nutt) Rydb.), and big sagebrush (Artemisia tridentata ssp. vaseyana Nutt.). The shrubs were consistently higher in both total and digestible protein than crested wheatgrass over the period of study. Fourwing saltbush and winterfat with 8.24 and 6.31% digestible protein, respectively, were found to be the most promising shrubs to be used to supplement the low protein content of crested wheatgrass for late fall grazing. To meet dietary requirements for gestating sheep would require a minimum of 56 to 69% of fourwing saltbush and winterfat respectively, in the diet. Sagebrush and rabbitbrush were lower in digestible protein content, 4.04 and 4.43%, respectively, and therefore could not be used alone with crested wheatgrass.
Vegetation and White-Tailed Deer Responses to Herbicide Treatment of a Mesquite Drainage Habitat TypeA honey mesquite drainage habitat (20% of a 1,215-ha study pasture) was aerially sprayed with 1.1 kg/ha of 2,4,5-T + picloram in the spring. Adjacent habitats (blackbrush acacia uplands, creeping mesquite flats, blackbrush acacia-dominated mixed brush, and creeping mesquite-mixed brush) were not sprayed. Discriminant treatment of the honey mesquite drainage habitat did not cause consistent differences in white-tailed deer use of that habitat nor did it change deer use of the pasture containing the sprayed drainage based on average daily fecal accumulation rates for 22.5 months after herbicide application. Lack of differences in deer use between sprayed and unsprayed habitats were attributed to minor impacts of sprays on forb populations during the study period, retention of ample cover screen for deer, and increased abundance of grasses on sprayed areas which presumably reduced use of preferred deer food items by cattle.
Vegetative Response of Goldenweeds and Rayless Goldenrod to Simulated Mechanical ControlTopgrowth was clipped at heights which simulated mechanical disturbance from potted common goldenweed, Drummond's goldenweed, and rayless goldenrod plants in the glasshouse. Resprouting occurred within days after clipping at the soil surface or at heights of 2 to 8 cm, but 50 to 100% of the plants clipped at the soil surface died within 5 to 10 weeks after treatment. No plants survived after topgrowth was removed at 2 cm below the soil surface. Mortality, numbers of adventitious sprouts on survivors, and stem elongation rates of regrowth varied little with species or phenological stage at treatment. Generally, topgrowth was completely replaced during the first growing season after clipping. Mechanical treatments which leave even small portions of rooted stems, such as shredding, roller chopping, or chaining, would not be effective against these undesirable subshrubs. Some control should be possible with blades such as the "stacker rake" which shears stems at ground level. Mechanical practices which sever the woody taproots at a shallow depth (discing or shallow root plowing) appear to be the most promising for control of these subshrubs.