Browsing by Subject "saltcedar"
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Item Changes in intake and nutritional quality of saltcedar(2012-05-12) Knight, Colt; Knight, Colt Watson; Scott, Cody B.; Salisbury Michael W.; Whitney, Travis R.; Hama, Mark L.; Angelo State University. Department of Agriculture.Recently weaned Boer-cross (n=20) and Angora (n=6) goats were individually penned and fed increasing amounts of saltcedar. Weight, intake, and water consumption data were monitored. In addition, saltcedar samples were collected during the months of June, July, August, September and October and analyzed for chemical composition. Boer-cross and Angora goats consumed 3.7 g·kg-1 of BW and 3.8 g·kg-1 of BW, respectively, of saltcedar (P > 0.05). Water consumption differed by breed at 0.8 L·d-1 and 2.1 L·d-1 for Angora and Boercross, respectively, but did not differ by period. Both breeds lost weight during the final period of the trial. Crude Protein of saltcedar ranged from 16.0% to 19.6% (P < 0.05) , and TDN averaged 68.5%. Sodium content of saltcedar varied from 0.1% to 2.4%. Dry Matter content averaged 32.2%.Item Impacts of goat browsing on salt cedar stands in West Texas(2013-05-24) Rogers, Grant Russell; Rogers, Grant Russell; Scott, Cody; Salisbury, Michael; Engdahl, Gil; Dailey, Jeffrey; Angelo State University. Department of Agriculture.The objectives were to measure goat performance and preference of saltcedar (SC) in a pasture setting as well as SC response to browsing. Sixteen Boer-cross goats were conditioned to SC in individual pens for 16 days. SC and basal diet intake was recorded during conditioning, as well as goat weights throughout the study. Ten goats were then placed in 20’X40’ pens situated in dense SC stands, three plots per treatment. Treatment 1 consisted of plots grazed once; Treatment 2 consisted of plots grazed twice, after sufficient re-growth was observed on the SC plants. Additionally, 18 SC seedlings were defoliated by hand and measured for height and mass. SC intake increased over time in the conditioning and field trials. Goat weight did not change. SC cover decreased following treatment but did not differ between treatments. Mortality did not occur in any seedlings but height and aboveground mass were reduced by defoliation.Item Relationship of salinity and depth to the water table on Tamarix spp. (Saltcedar) growth and water use.(Texas A&M University, 2004-09-30) Schmidt, Kurtiss MichaelSaltcedar is an invasive shrub that has moved into western United States riparian areas and is continuing to spread. Saltcedar is a phreatophyte that can utilize a saturated water table for moisture once established and is also highly tolerant of saline soil and water conditions. Literature has indicated that depth to the water table and salinity have a significant effect on growth and water use by saltcedar. Several studies were initiated to help develop a simulation model of saltcedar growth and water use based on the EPIC9200 simulation model. A study was initiated at the USDA-ARS Blackland Research Center Temple, Texas in the summer of 2002 to better understand the effects of water table depth and salinity on (1) saltcedar above and below ground biomass, root distribution, leaf area and (2) water use. Five different salinity levels (ranging from 0 ppm to 7500 ppm) and three different water table depths (0.5m, 1.0m, and 1.75m) were studied. Results indicated that increasing depth to the water table decreased saltcedar water use and growth. For the 0.5m water table depth, saltcedar water use during the 2002 growing season averaged 92.7 ml d-1 while the 1.75m depth averaged 56.6 ml d-1. Both root and shoot growth were depressed by increasing water table depth. Salinity had no effect on saltcedar growth or water use except at the 1250 ppm level, which used 110 ml of H2O d-1. This salinity had the highest water use indicating that this may be near the ecological optimum level of salinity for saltcedar. A predictive equation was developed for saltcedar water use using climatic data for that day, the previous day's climatic data, water table depth and salinity that included: previous day total amount of solar radiation, water table depth, previous day average wind speed, salinity, previous day total precipitation, previous day average vapor pressure, minimum relative humidity, previous day average wind direction, and maximum air temperature. Data from the field study and a potential growth study were integrated into the model. The model was parameterized for the Pecos River near Mentone, Texas. Predicted saltcedar water use was slightly lower than results reported by White et al. 2003.