TILLAGE AND ROTATION EXPEEIMENTS 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 



SPP/NG S/JMPUA/G 



SUMMER S/IMPL/A/G 



PALL &4MPL/A/G 





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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. 



