TILLAGE AND ROTATION EXPERIMENTS AT NEPHI, UTAH. 
35 
number on the cultivated plat was 4.17, while on the uncultivated 
plat it was 4.05. The particular areas which were counted on the 
uncultivated plat, however, showed a thinner stand than those on 
the cultivated plat, so that the number of culms per plant does not 
show entirely the difference in development. The number of plants 
per acre on the uncultivated plat, as indicated by the areas counted, 
was 165,000 with a total of 663,000 culms. On the cultivated plat, 
the stand was 193,000 plants to the acre, with 805,000 culms, which 
was over 21 per cent more than on the uncultivated plat. On only 
one of the four uncultivated areas counted was the stand as thick as 
on the cultivated areas. On this area the average number of culms 
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Fig. 18.— Graphs comparing the average percentage of moisture in each of the upper 6 feet of soil at 
the beginning, in the middle, and at the end of the crop season, as found in the spring-cultivation 
tests of winter wheat at the Nephi substation, 1909 to 1913, inclusive. 
per plant was 3.74. On a cultivated area, with practically the same 
stand, the number of culms per plant was 4.14, an increase of 11 per 
cent. 
On the same areas on the uncultivated plats the average yield per 
unit area 3.3 feet square was 156 grams of straw and 103 grams of 
grain. On the areas in the cultivated plats the yields were 199 
grams of straw and 114 grams of grain. These figures indicate that 
cultivation caused a marked increase (27.6 per cent) in yield of straw, 
but a much smaller increase (10.7 per cent) in yield of grain. The 
yields obtained on the unit areas are contradictory to those from the 
entire plats, as shown in Table XIV, which shows a decrease in yield 
on the cultivated plat of 6.4 per cent. 
