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<br />t~ <br />HERHACECU3 COVER <br />ifULCH-COt~ARISON PLOTS <br />Herbaceous cover was sampled on September 6, 1978, July 25, 1979, and <br />August 25, 1980• Results from all three dates are summarized here to show <br />trends, as well as differences among mulching treatments: <br />Initially, manure xas the best mulching material due primarily to its <br />fertilizer effect; however, there xere no significant differences remain- <br />ing among mulching treatments in 1980. Trends ir: cover over the years <br />were significantly downxard xith each mulching treatment. The best grow- <br />ing conditions occurred in 1978 when the plots xere irrigated for plant <br />establishment and maximum plant growth. 3ut even with irrigation, total <br />growing-season moisture was ,just one inch more in 1978 than in 1979. Thus, <br />plant growth and cover attainment in 1979 probably could have held up near <br />1978 values if the sand had not been compacted in the process of top soil <br />removal and replacement before seeding. The combined effects of compaction <br />and less precipitation in 19~ decreased plant growth and cover attainment <br />to an average of ,just 8p, <br />DEEP SAND REFERENCE AREA <br />Herbaceous cover as sampled on July 25, 1979. xas as follows: <br />Perennial herbaceous plants ------ 8 t 1~ <br />Annual herbaceous plants ---------~ t 19L <br />Total herbaceous cover ---------- 13,E <br />DEPTH OF SAND OVER SHAIE <br />Herbaceous cover on September 6, 1978, July 25, 1979, and August 25, <br />1980 xas as follows: <br />Year 1 foot 2 feet feet Mea <br /> --^------ --- Percent cover °----- ----- <br />1978 45 52 48 48 <br />1979 42 23 20 28 <br />• <br />6 <br />1978 31 44 38 38 <br />1979 18 29 28 2$ <br />1880 7 7 1T 8 <br />