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I JAN <br />FEB <br />MAR <br />APR <br />MAY <br />JUN <br />JUL <br />AUG <br />SEP <br />OCT <br />NOV <br />DEC <br />0 <br />0 <br />5 <br />10 <br />22 <br />35 <br />15 <br />10 <br />3 <br />0 <br />0 <br />0 <br />( JAN <br />FEB <br />MAR <br />APR <br />MAY <br />JUN <br />JUL <br />AUG <br />SEP. <br />OCT <br />NOV <br />DEC <br />0 <br />0 <br />0 <br />5 <br />30 <br />40 <br />20 <br />5 <br />0 <br />.0 <br />0 <br />0 <br />Site Type: Rangeland <br />MLRA: 69 - Upper Arkansas Valley Rolling Plains <br />Production ranges from 100 to 350 pounds of air -dry vegetation per acre per year and averages 200 <br />pounds. <br />The following is the growth curve of this plant community expected during a normal year: <br />Growth curve number: C06907 <br />Growth curve name: Warm season dominant; MLRA -69; upland coarse textured soils. <br />monthly percentages of total annual growth) <br />Transitions or pathways leading to other plant communities are as follows: <br />• Heavy continuous grazing without adequate recovery periods following each grazing event will <br />shift this plant community across an ecological threshold toward the Bare Ground, Cryptogams, <br />Annuals Plant Community. Soil erosion is a major concern. <br />• Long -term prescribed grazing with adequate recovery periods between grazing events will move <br />this plant community toward the Increased Blue Grama with Decreased Mid and Tall Grass Plant <br />Community and eventually toward the HCPC, assuming an adequate seed source and /or remnant <br />plants are available. This transition may take upwards of 40 years or more to achieve. <br />Bare Ground, Cryptogams, Annuals Plant Community <br />This plant community is caused by heavy continuous grazing and /or excessive defoliation without <br />adequate recovery opportunity given during the growing season. Bare ground, cushion plants and <br />cryptogamic crusts have significantly increased. Remnant amounts of blue and /or hairy grama may <br />still be found. Other plants that may be present are Russian thistle, kochia, red threeawn, cheatgrass, <br />cushion plants (mat loco, sessile nailwort, Hoods phlox) and small soapweed. <br />Soil erosion is severe. Desertification is obvious. <br />Total annual production can vary from 25 to 150 pounds of air -dry vegetation per acre per year. <br />The following is the growth curve of this plant community expected during a normal year: <br />Growth curve number: C06905 <br />Growth curve name: Warm season dominant, cool season sub - dominant; MLRA -69; upland coarse <br />textured soils. <br />monthly percentages of total annual growth) <br />Transitions or pathways leading to other plant communities are as follows: <br />• Long-term prescribed grazing will move this plant community toward the Blue Grama Sod Plant <br />Community assuming an adequate seed /vegetative source is available. This transition may take <br />40 years or more to achieve. <br />Technical Guide <br />Section IIE <br />8 <br />Gravel Breaks <br />R069XY064C0 <br />USDA NRCS <br />Rev. 3/04 <br />