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100 data points) represented an observation in the sample. <br />Therefore, the estimated mean cover for a particular species in the vegetation type as a whole was <br />derived by summing the percent cover measured on each transect and dividing by the total number of <br />transects sampled. <br />Vegetation Production <br />Production yield (pounds per acre per year) for Dryland Pasture will be determined by a random <br />sampling method. This system will consist of: <br />1. Gridding the entire dryland pasture reclaimed field being considered for bond release on a 50 <br />by 50 foot pattern. The grid blocks will be sequentially numbered from the upper northwest <br />corner to the lower southeast of each field. Only whole blocks will be numbered for the purpose <br />of use in the random generator discussed below. If there are separate fields, then the block <br />numbers will be combined into one data base. <br />2. The total acreage of the dryland pasture being considered for production yield will be measured <br />and one sample will be taken for every four acres of field. For example, if the study area has <br />60 acres total, 15 samples will be taken, If the acreage is less than 60 acres, then a minimum <br />of 15 samples will be taken. A minimum of 15 randomly located sample quadrant placements <br />will be made per sample block, with additional sample quadrants taken if necessary to achieve <br />sample adequacy based on the formula in the next section. <br />3. Once the number of sample points is determined, a random number generator from the <br />Microsoft Access database program will be run. The random numbergeneratorwillusethetotal <br />• number of 50 by 50 foot block numbers generated in step 1 of this procedure and the number <br />of sample points required from step 2 of this procedure. <br />4. All randomly selected sample points will be identified by UTM latitude and longitude coordinates <br />and located in the field by a hand-held GPS device. When the center of the sample block is <br />located, a 0.25 square meter PVC pipe grid will be tossed over the back of the sampler's head <br />to determine the final sample grid to be cut and collected. The vegetation within the sample grid <br />will be clipped as close to the ground as practical and gathered and air dried for 96 hours to <br />simulate field drying before it is weighed and the yield peracre is calculated. Perennial grasses, <br />perennial (orbs, and annual species shall be bagged and weighed separately. Noxious weeds <br />will not be included. The results from all sample points will be mathematically averaged. <br />Sample Adequacy <br />The following formula was used to determine the sampling adequacy of the quantitative cover <br />(perennial non-restricted and non-noxious species) and production in the New Horizon I studies: <br />Page Two, Sept. 2004 <br />s = sample standard deviation <br />t =single tailed t-value at the 90 percent confidence interval <br />(alpha = 0.10) with infinite degrees of freedom (t = 1.645) <br /> <br />