TILLAGE AND ROTATION EXPERIMENTS AT NEPHI, UTAH. 



37 



Table XV. — Annual and average yields of winter wheat harvested at four different stages 

 of maturity at the Nephi substation, for the years 1909 to 1912, inclusive.. 



Stage of maturity when harvested. 



Green dough 

 Hard dough . 

 Fully ripe . . . 

 Overripe . . . 



Yield per acre of grain (bushels). 



1909 1910 1911 1912 



7.83 

 8.83 

 6.33 

 8.50 



14.00 

 13.80 

 12.70 



20.30' 

 26.40 

 24.60 

 20.70 



6.50 

 10.20 

 11.50 

 11.80 



10.86 

 14.86 

 14.06 

 13.43 



Table XV shows that with one exception the yield each year 

 favored harvesting in the hard-dough stage, though the differences 

 are not great. The earliest harvest gave the smallest yields, due 

 probably to the shrinking of the grain. The small decrease in the 

 average yield from hard dough to overripe was probably due to 

 shattering at harvest time. 



FREQUENCY OF CROPPING LAND TO WINTER WHEAT. 



One of the first tests begun by the Utah experiment station on the 

 Nephi farm was planned to determine the relative return from 

 cropping land to winter wheat continuously, every second year, one 

 year in three, and two years in three. This test was conducted on 

 four fifth-acre plats until the fall, of 1907, when five tenth-acre plats- 

 were added, to allow the production of a crop under each condition 

 each year. Since 1907, then, nine plats have been used. 



The total yields per acre of the four fifth-acre plats obtained pre- 

 vious to 1908, the annual and total acre yields of all the plats from 

 1908 to 1913, and the total yields of the fifth-acre plats from 1904 to 

 1913, inclusive, are reported in Table XVI. 



Table XVI. — Annual and total yields of winter wheat obtained from continuous and 

 alternate cropping and from growing one and two crops in three years at the Nephi 

 substation, 1904 to 1913, inclusive. 





Yield per acre of grain (bushels). 



Frequency of 

 crop. 



Total 

 yield, 

 1904 to 

 1907.1 



1908 



1909 



1910 



1911 



1912 



1913 



Total, 



1908 to 



1913. 



Total, 



1904 to 



1913. 



Continuous 



Alternate 



Do 



60.20 

 50.80 



13.41 



32.66 



Fallow. 



32.74 



Fallow. 



21.16 



Fallow. 



Fallow. 



19.16 



14.58 



Fallow. 



2.50 



13.42 



2.50 



Fallow. 



Fallow. 



3.50 



Fallow. 



7.80 



9.90 



Fallow. 



Fallow. 

 10.30 

 8.20 



5.00 

 Fallow. 

 Fallow. 



5.70 



Fallow. 



28.00 



23. 60 



Fallow. 



8.10 



Fallow. 



Fallow. 



27.00 



6.00 



4.80 



Fallow. 



3.90 



6.50 



Fallow. 



Fallow. 

 . 10. 80 

 Fallow. 



4.50 



Fallow. 



1.83 



Fallow. 

 6.83 

 2.33 



11.17 



Fallow. 

 Fallow. 



51.99 

 47.36 

 32.33 



73.66 

 26.13 

 39.79 



16.17 

 14.30 

 46.16 



112. 19 

 98.16 



Two crops in 



three years 



Do 



25. 10 



98.76 



Do 







One crop in three 



49.10 



65.27 



Do 





Do 













1 Taken from Bulletin 112 of the Utah Agricultural Experiment Station. 



