TILLAGE AND ROTATION EXPERIMENTS AT NEPHI, UTAH. 



23 



The results presented in Table VIII show no correlation between 

 time of seeding and yield. Early seeding has given the best results 

 in some years, while in others the best yields have come from late 

 seeding, especially those in October. It will be observed, however, 

 that as a rule the best yields have come from seeding between Sep- 

 tember 1 and October 15. 



SOIL MOISTURE AT SEEDING TIME. 



Beginning in the fall of 1908, the plats used in the time-of -seeding 

 test were sampled to a depth of 6 feet just priof to the seeding of the 

 plats. In the later years, when two varieties were sown, composite 

 samples of both plats were taken. The percentages of moisture in 



2 *? e & /o /2 /*? 



/e 



/s 



zo 



/3.S 



Fig. 13. — Diagram comparing the 10-year average yields of winter wheat obtained in the time-of- 

 seeding tests at the Nephi substation, 1904 to 1913, inclusive. 



each foot of soil at seeding time as shown by these samples are given 

 in Table IX. 



Table IX. — Annual and average percentages of moisture in each of the first 6 feet of soil 

 at different dates of seeding at the Nephi substation, for the years 1908 to 1912, inclusive. 



Date of seeding. 



Depth of 

 sampling. 



19081 



1909 



1910 



1911 



1912 



Average. 



Aug. 15 



1 

 2 

 3 

 4 

 5 

 6 



16.40 

 17.30 

 14.12 

 12.45 

 12.95 

 12.37 



14.60 

 19.05 

 17.10 

 18.30 

 20.60 

 18.15 



12.85 

 17.44 

 16.12 

 17.33 

 18.25 

 17.20 



12.67 

 15.55 

 10.87 

 10.84 

 12.24 

 14.48 



13.65 

 17.75 

 14.48 

 12.40 

 9.88 

 11.60 



14.03 



17.42 

 14.54 





14.78 

 14. 76 





14.26 



17.96 



16.53 



12.78 



13.29 



14.96 





f 1 



2 

 3 

 4 

 5 

 6 





Sept. 1 



15.95 

 18.10 

 15.35 

 10.70 

 9.75 

 10.82 



17.30 

 18.30 

 17.75 

 19.45 

 17.75 

 18.30 



14.73 

 17.33 

 16.28 

 17.05 

 16.60 

 19.15 



11.60 

 15.04 

 11.80 

 10.75 

 8.01 

 9.08 



15.65 

 18.83 

 15.87 

 12.03 

 10.60 

 13.12 



15.05 

 17.52 

 15.41 





14.00 

 12.52 

 14.09 





13.44 



16.32 

 16.70 

 14.92 

 10.22 

 10.57 

 11.45 



18.14 



16.84 



11.05 



14.35 



14.76 





1 

 2 

 3 

 4 

 5 

 6 





Sept. 15 



17.45 

 18.75 

 17.00 

 17.55 

 16.85 

 17.40 



12.10 



17.38 

 16.53 

 17.45 

 16.22 

 17.65 



9.97 

 12.53 

 11.20 

 12.44 

 11.93 

 11.00 



11.91 

 16.69 

 15.24 

 13.09 

 9.23 

 10.61 



13.55 

 16.41 

 14.98 





14.15 

 12.96 

 13.62 





13.36 







17.50 



16.22 



11.51 



12.80 



14.28 









1 One plat only. In each of the other years the figures given are the average of two plats. 



