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2) The total acreage of the irrigated pastureland being considered for production yield will be <br />measured and one sample will be taken for every four acres of field. For example, if the <br />study area has 60 acres total, 15 samples will be taken. If the acreage is less than 60 <br />acres, then a minimum of 15 samples will be taken. <br />3) Once the number of sample points is determined, a random number generator such as the <br />one provided in the QuattroPro Spreadsheet Program, will be run. The random number <br />generator will use the total number of 50 foot by 50 foot block numbers generated in step <br />1 of this procedure and the number of sample points required from step 2 of this procedure. <br />4) All randomly selected sample blocks from step 3, will be located in the field by standard <br />surveying methods. After the 50 x 50 foot sample block is field staked, a 3 foot x 3 foot <br />sample grid square will be tossed overthe back of the samplers head to determine the final <br />sample grid to be cut and collected. The vegetation within the 3 x 3 foot sample grid will <br />be clipped as close to the ground as practical and gathered and air dried for 96 hours to <br />simulate field hay drying, before it is weighed and the yield per acre is calculated. The <br />results from all 3 x 3 foot sample points will be mathematically averaged. <br /> <br />5) The data will be evaluated for sampling adequacy using the following formula: <br />Nm~° _ [(t° + tn)2 " (sZ)IKdQ)z <br />where: <br />Nm;° =minimum number of sampling grids to achieve sampling adequacy. <br />s =sample standard deviation <br />O = 90% of technical standard <br />to =the (a=.10) t table value for a single tailed t-test with (n-1) degrees <br />of freedom <br />tp =the (a = .25) t table value for a single tailed t-test <br />d = desired level of reduction about the sample mean (0.10 for 90% <br />confidence) <br />6) WFC would like to reserve the option to measure vegetation production by the old <br />fashion method, which is, cut, bale, weigh and count bales. <br />• (Revised i-is-o3) 2.05.4(2)(e)-20 <br />