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Revegetation Success Criteria and Statistical Procedures - Irrigated Pasture <br />Revegetation will be deemed adequate if vegetation cover and herbaceous production at the <br />reclaimed site is at least 90% of the vegetative cover at the reference area and herbaceous <br />production is at least 90% of the reference area standard, after the weighted average soil <br />adjustment, in conformance with DRMS Regulations 4.15.8. The weighted average factor will be <br />applied to production only. One of the three statistical comparison methods in DRMS Regulations <br />4.15.11(2) subsections (a), (b), or (c) will be used, according to the following procedures. <br />For a quality standard, the following is proposed: <br />At least 75% of the relative production will be comprised of seeded species or species of <br />comparable quality as livestock forage. County fisted -noxious weed "species will' not be counted <br />toward the success standard for cover or production in any reclaimedor-reference areas. For the <br />purposes of this demonstration, a statistically adequate production sample will be taken, or a <br />minimum of 30 observations. <br />Sample adequacy will be tested during field sampling using the formula in DRMS Regulation <br />4.15.11(2)(a), as follows: <br />t232 <br />nm (?)2 <br />where: <br />n n = minimum sample size <br />Z <br />S = Sample variance (n-1 degrees of freedom) <br />d = Precision (0.10 for cover and production; 0.15 for woody <br />plant density) <br />x = Sample arithmetic mean <br />t = The (a=.10) t-table value for a 1 tail t-test, n-1 degrees of <br />freedom (infinite degrees of freedom may be used if n>30) <br />n = Sample size <br />Revised 08May09 TR58 2.05.4(2)(e) -19N <br />Approved 13 A" 2009