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HERBAGE YAWS <br />Herbage yields on the mulch-comparison plots were sampled by clipping <br />i square meter plots on July 24, 1979, and oven drying. Differences among <br />mulching treatments, which were highly significant, reveal the fertilizer <br />effect of manure, as follows: <br />Strax -------------------- 1,344 kg/ha oven dry <br />Manure at 15 t/a -------- 1,814 <br />Manure at 30 t/a --------- 2,244 <br />Yields on the depth-of-sand-over-shale plots sampled at the same <br />time xere as follows: <br />1 foot of sand ------------ 2,330 kg/ha oven dry <br />2 feet of sand ----------- 2,142 <br />3 feet of sand ------------ 1,168 <br />These depth-of-sand plots were all mulched xith manure and planted to the <br />same seed mixture used on the mulch-comparison plots. Our hypothesis that <br />yields xould increase with increasing depth of 'sand xas incorrect, presumably <br />because the compacted sand prevented the grasses from rooting deep enough <br />to utilize moisture and fertility at depths much greater than one foot. <br />?tevertheless, all of those yields in 1979 xere very good compared to <br />• the yield of herbaceous plants on the deep sand reference area, xhich was <br />as follows: <br />Perennial herbaceous plants --- 390 kg/ha oven dry <br />Mnual herbaceous plants ------ 264 <br />Total ------------------------- 5~2 <br />Reference-area yields probably could be doubled by controlling sand sage, <br />and could be changed toward greater proportion of perennial plants by <br />manipulating the season of grazing and the proportion of rest to grazing-- <br />that is, by improving range condition and plant vigor. <br />~~ 5 <br />