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• Plant species frequency or presence was derived by dividing the number of plots or transects at which a <br />species occurred by the total number of plots or transects sampled in each of the three vegetation types <br />for which cover samples were obtained. Products were multiplied by 100 to express frequency as a <br />percentage. <br />Vegetation Production - 1999. Quantitative measurements of vegetation production were made in the <br />sagebrush - 1 (SG-1), sagebrush - 2 {SG-2), sagebrush reference area, dryland pasture reference area, <br />irrigated pasture, irrigated hayland, and swaleldrainage vegetation types. <br />In 1999 no range exclosures were present. The observer picked pastures that had not been subjected to <br />current year grazing for sampling. <br />Production data was collected concurrently with measurements of vegetation cover and frequency. In <br />keeping with 1987 procedures, no attempt was made to sample production in the cattail or willow <br />component of the Swale/drainage primarily because of immeasurability. <br />Measurements of above-ground plant biomass were made using a 0.25m' square plot in both the <br />graminoid component of the dryland pasture area, irrigated haylands, Swale/drainage and irrigated <br />• pasture types. A 1.Om' plot was used in the sagebrush types. Within each production plot, all green, <br />living herbaceous plant material was clipped as close to ground level as possible, separated by lifeform <br />(annual (orbs, annual graminoids, perennial (orbs, and perennial graminoids), immediately weighed <br />using a Pesola 41002 field scale, and bagged for laboratory analysis. Shrubs were clipped of annual <br />growth, bagged and weighed. Herbaceous plant material was not sorted In the irrigated pasture samples. <br />In the laboratory, samples were oven-dried at 30°C in a forced draft oven for 72 hours, or until a constant <br />weight was obtained. Dry weights were obtained on an Sartorius E8001Pcop-loading electronic balance <br />which is accurate to the nearest 0.001 gm. <br />Production sampling methods for the irrigated hayland vegetation type at the New Horizon 2 study area <br />were consistent with those used in 1987. Five hayland fields had been mowed and baled during the study <br />period. These field were all first cuttings. Three fields, belonged to Morgan and two fields belonged to <br />Johnson. All fields were mowed by Morgan and baled using his Heston 4650 Bailer. The bales measured <br />42 in. X 18 in. X 16 in. Morgan said dry bales consistently weigh between 85 to 90 pounds ever since he <br />obtained the bailer. <br />• (REVISED 8175IDD) 2.!)4.1!) - 20 <br />