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L ALUI cu <br />avua. <br />FEB <br />MAR <br />APR <br />MAY <br />JUN <br />JUL <br />AUG <br />SEP <br />OCT <br />NOV <br />DEC <br />( JAN <br />0 <br />0 <br />3 <br />7 <br />22 <br />33 <br />18 <br />12 <br />5 <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 />0 <br />15 <br />45 <br />25 <br />15 <br />0 <br />0 <br />0 <br />0 <br />Loamy <br />R069XY006CO <br />Site Type: Rangeland <br />MLRA: 69 - Upper Arkansas Valley Rolling Plains <br />The following is the growth curve of this plant community expected during a normal year: , <br />Growth curve number: C06902 <br />Growth curve name: Warm season /cool season co- dominant, excess litter; MLRA -69; upland fine <br />(monthly percentages of total annual growt <br />Transitions or pathways leading to other plant communities are as follows: <br />• Prescribed grazing with adequate recovery periods between each grazing event and proper <br />stocking can restore this plant community back to the Western Wheatgrass, Blue Grama, Galleta, <br />Fourwing Saltbush Plant Community (HCPC). <br />Blue Grama /Buffalograss Sod; Broom Snakeweed Plant Community <br />This plant community developed with repeated continuous grazing without adequate recovery periods <br />between grazing events and occurs frequently throughout most of MLRA -69. Galleta has been <br />reduced. Green needlegrass, American vetch, purple prairie clover, fourwing saltbush and winterfat <br />have been removed. Western wheatgrass may persist in trace amounts, in protected areas and <br />higher precipitation regimes within the MLRA. Blue grama and buffalograss dominate the community <br />and can form a "sodbound" appearance. Red threeawn, sand dropseed, tumblegrass, bottlebrush <br />squirrletail, sixweeks fescue, plains pricklypear and hairy goldaster will all increase in varying <br />degrees. In some instances, broom snakeweed will significantly increase. <br />This plant community is resistant to change due to grazing tolerance of buffalograss and blue grama. <br />A significant amount of production and diversity has been lost when compared to the HCPC. Loss of <br />cool season grasses, fourwing saltbush and winterfat, and nitrogen fixing forbs have negatively <br />impacted energy flow and nutrient cycling. Water infiltration is reduced significantly due to the <br />massive shallow root system "root pan ", characteristic of sodbound blue grama and buffalograss. Soil <br />loss may be obvious where flow paths are connected. <br />It will take a very long time to restore this plant community back to the HCPC with improved <br />management. Renovation would be very costly. Desertification is advanced. <br />Production ranges from 100 to 400 pounds of air -dry vegetation per acre per year and averages 250 <br />pounds. <br />The following is the growth curve of this plant community expected during a normal year: <br />Growth curve number: C06904 <br />Gr owth curve name Warm sin dominant <br />1 MLRA -69: upland fine textured soils. <br />(monthly percentages of total annual growt <br />Transitions or pathways leading to other plant communities are as follows: <br />• Heavy continuous grazing, excessive defoliation without adequate recovery periods following each <br />grazing event and in some cases, long -term non -use will shift this plant community (or any plant <br />community) toward the Red threeawn, Annuals, Bare Ground Plant Community. This transition <br />may take greater than 40 years. Erosion and loss of organic matter /carbon reserves are <br />concerns. <br />Technical Guide <br />Section IIE <br />9 <br />USDA NRCS <br />Rev. 3/04 <br />