. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PLANT SUCCESSIOH AND RANGE MANAGEMENT. 11 Table 1.—Precipitation in the heart of the ivheat-grass formation, 10,000 feet elevation, Manti National Forest, 191Jf-1917, inclusive. Year. June. July. Aug. Sept. 1914 Inches. .18 Inches. Inches. .30 .50 Inches. .39 .30 1915 1916 1917 .90 The average precipitation for the month as well as for the season varies widely. The greatest variation since 1914 in rainfall in June was inches, the maxim
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PLANT SUCCESSIOH AND RANGE MANAGEMENT. 11 Table 1.—Precipitation in the heart of the ivheat-grass formation, 10,000 feet elevation, Manti National Forest, 191Jf-1917, inclusive. Year. June. July. Aug. Sept. 1914 Inches. .18 Inches. Inches. .30 .50 Inches. .39 .30 1915 1916 1917 .90 The average precipitation for the month as well as for the season varies widely. The greatest variation since 1914 in rainfall in June was inches, the maximum being inches in 1917, and the mini- mum inch in 191G. In July the variation was inches, the maxi- mum being inches in 1917 and the minimum inch in 1914. Nearly 40 per cent of the inch of precipitation recorded in June, 1916, fell during the first half of the month, while nearly 68 per cent of the of an inch recorded in July, 1914, fell after July 20. Since only of an inch of rain was recorded in June, 1914, the soil was far below the average in water content. Ob- servations indicated that the un- questionable slowing down of growth noted after the first week in July, 1914, was due to an inadequate water supply. Owing to the exceptionally low water requirements for the sur- vival of both the bunched and the turfed species of wheat grass, pro- longed periods of soil desiccation, covering critical periods of one or more seasons, seem to have little effect on well-established plants other than to decrease temporarily the aerial growth and the repro- duction. However, young stands of turfed species usually suffer ap- preciably less injury from soil desiccation than stands of bunch grass of similar age. This is accounted for by the fact that reproduction in the case of the turfed species is largely by extensive rootstocks which have little or no tendency to shoot out until the plant is per-. <S"— /J-"—' Fig. Small whea
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