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Annual Production by Plant Type <br /> Annual Production(lbs/ac) <br /> Representative <br /> Plant type Low value High <br /> Forb 150 200 255 <br /> Grass/Grasslike 600 1300 1690 <br /> Shrub/Vine 50 150 255 <br /> Total: 800 1650 2200 <br /> Plant Growth Curve <br /> Growth curve number c06709 <br /> Growth curve name: Warm season dominant,cool season sub-dominant,MLRA-6713;upland coarse textured soils. <br /> Growth curve description: <br /> Percent Production by Month <br /> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br /> 0 0 2 7 25 35 15 10 5 1 0 0 <br /> 31 <br /> 31 <br /> P 28 <br /> r 24 <br /> 0 21 <br /> d <br /> u 77 <br /> c 14 <br /> t <br /> i 10 <br /> o 7 <br /> n 3 <br /> Jan Feb Mar Ayr May Jrn Ad AW Sep � Nw ❑ec <br /> At-Risk Plant Community <br /> This plant community develops with continuous grazing without adequate recovery periods between grazing events,and/or extended drought, <br /> and/or reduced fire frequency.When compared to the Reference Plant Community sand bluestem,prairie sandreed,switchgrass,leadplant <br /> and western sandcherry have decreased in frequency and production.Blue grama has increased.Sand dropseed,Fendler threeawn,hairy <br /> goldaster,croton,slimflower scurfpea,western ragweed,stickleaf,heath aster,lupine,loco,milkvetch and plains pricklypear cactus have <br /> increased.Soils that have a sandy loam or coarser subsoil will show an increase in sand sagebrush. <br /> Continuous spring grazing with summer deferment will reduce the cool-season component(needle and thread,western wheatgrass,sun <br /> sedge)of this plant community and increase the warm-season component.Continuous summer grazing with spring deferment will reduce the <br /> warm-season component(sand bluestem,prairie sandreed,and switchgrass)of this plant community and increase the cool-season <br /> component. <br /> The risk of losing key warm-season tallgrasses,important(orbs and shrubs is a major concern.Blue grama is increasing at the expense of the <br /> tallgrasses and deep-rooted shrubs.Water cycle,nutrient cycle and energy flow may become impaired due to a shift in root structure and <br /> species composition.Less litter is being produced. <br /> Production in this community can vary from 400 to 1,200 pounds of air-dry vegetation per acre per year depending on weather conditions and <br /> averages 900 pounds. <br /> Plant Growth Curve <br /> Growth curve number c06710 <br /> Growth curve name: Warm-Season Dominant,MLRA-6713;upland coarse-textured soils. <br /> Growth curve description: <br /> Percent Production by Month <br /> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br /> 0 0 0 5 20 40 20 10 5 0 0 0 <br /> m c,n,.a,c_ <br /> % 36 <br /> P 32 <br /> r 28 <br /> 0 24 <br /> d <br /> u 20 <br /> c 1G <br /> t <br /> i 12 <br /> 0 s <br /> n 4 <br /> O Jan Feb Aar Ayr May J- JW AW Sep W Nw ❑ec <br /> 8 of 18 <br />