12 



BULLETIN 157, IT. S. DEPARTMENT OF AGRICULTURE. 



in the fall of 1909. Since this time the plats have been alternately 

 fallowed and cropped to winter wheat, receiving uniform treatment 

 in every case except in the depth of plowing. They were replowed 

 or double disked each year in order to destroy weeds and volunteer 

 grain. 



The depth of plowing on the different plats in the fall of 1908, 1910. 

 and 1912 was as follows: 16A, subsoiled, 18 inches; 17A, subsoiled, 

 15 inches; 18 A, plowed, 10 inches; 19 A, plowed, 5 inches. The 

 depth of plowing on the different plats in the fall of 1909, 1911, and 

 1913 was as follows: 16C, subsoiled, 18 inches; 17C, subsoiled, 15 

 inches; 18C, plowed, 10 inches; 19C, plowed, 5 inches. 



Table IV. — Annual and average percentages of moisture for each of the first 6 feet of 

 soil in plats plowed to different depths at the Nephi substation, samples taken in April, 

 June, and September, for the years 1909 to 1912, inclusive. 



SUBSOILED 18 INCHES DEEP. 



Depth of sampling. 



Date of determination. 



1909 



1910 



Average. 



1 foot. . 



2 feet.. 



3 feet.. 



4 feet.. 

 •5 feet. . 

 6 feet.. 



Average. 



22.00 

 21.40 

 21.25 

 20.00 

 19. 05 

 19.50 



17.37 

 21.35 

 19.55 

 19.45 

 19.50 

 20.22 



18.05 

 20.40 

 19.55 

 19.00 

 18.65 

 20.60 



13. 05 

 19.80 

 16. 53 

 17. 65 

 17. 83 

 18. 93 



19.50 

 20. 45 

 15.20 

 13.19 

 14.72 

 16. 58 



14.83 

 18.41 

 16.90 

 14.63 

 15.51 

 17.79 



15. 95 

 17.79 

 18.17 

 17.08 

 16.30 

 17.46 



20.99 

 21.71 

 18.61 

 12. 95 

 13.35 

 12.47 



18.89 

 20.98 

 19.60 

 16.65 

 14.64 

 17.89 



18.51 

 17.38 

 14.98 

 10.48 

 15.91 



20.53 



19.57 



19.38 



17.30 



16.61 



16. 35 



17.12 



16.68 



18.11 



14.49 



20.71 

 21.07 

 18.94 

 16.52 

 16.57 

 17.15 



16.06 

 20.06 

 18.85 

 17.28 

 16.87 

 18.66 



18.49 



17.96 



14.18 

 19.13 

 17.91 

 17.18 

 15.82 

 18.23 



17.07 



SUBSOILED 15 INCHES DEEP. 



lfoot 



2 feet 



3feet 



4 feet 



5 feet 



6 feet 



Average 



21. 62 18. 

 22. 40 20. 

 20. 65 19. 

 20. 20 19. 

 18.5018. 

 19.9021. 



2018. 

 8019 

 60 19 

 15 19 

 30 18 

 35 20 



00 20. 27 14. 35 14. 30 20. 73 16. 7518. 20|26. 94 16. 97,13. 82 22. 39 16. 58 16. 

 70 21. 2318. 60 20. 25 21. 02 19. 6S|l9. 6621. 50|20. 30 19. 60 21. 5419. 85 19. 1 



75 20. 57 

 5519.63 

 90 17. 75 



25 20. 15 



20.54:19.5719.3619.93 



I 



18. 78 18. 4016. 70113. 4719. 5018. 85 

 17.7017.6015.93 



17.65;i7.2814.81 

 19. 65 18. 9018.20 



15. 20 

 19.11 



18.38 



18.25 



19.29 



16.57,18.3719.14117.1119.01 

 17. 58 15. 91 18. 32 18. 20 17. 76 

 13. 5213. 00 15. 94 16. 1716. 22 



19.01 



17.33 



16.1419.41 



19.7818.62 

 17.95|l7.92 



PLOWED 10 INCHES DEEP. 



1 foot. . 



2 feet . . 



3 feet.. 



4 feet.. 



5 feet.. 



6 feet.. 



Average. 



15.35 

 20.45 

 18.68 

 17.88 

 17.7; 



is. ss 



is. r 



20.9017.80 

 18. 20 l 2O. 83 

 17.84J9.89 

 14. 4617.15 

 15.8016.14 

 17. 99 18. 43 



17. 53 18. 37 



16. 39 22. 1218. 2313. 91 

 20. 03121. 9019. 8318. 63 



4016. 

 13 20. 

 13 19. 

 35 17. 

 09 16. 

 22 18. 



17.66 



PLOWED 5 INCHES DEEP. 



1 foot. . 



2 feet.. 



3 feet.. 



4 feet.. 



5 feet . . 



6 feet.. 



Average. 



21.65 

 21.85 

 21.20 

 20.30 

 19. 55 

 20.00 



20.76 



15.10 

 20.40 

 19. 35 

 18.50 

 17.92 

 18. 95 



IS. 37 



17.05 20.90 15.6514.83 

 18.70 21.3019.9819.88 

 19.0019.0817.3018.50 

 18. 6018.23116. 6818.13 

 18. 00 19. 05 18. 93 1 19. 73 

 19.7016.3515.9315.50 



94 17. 

 54 19. 

 1719. 

 2617. 

 59 17. 

 59,17. 



50 22. 

 55.24. 

 4419. 

 5914. 

 20 '16. 

 19 16. 



18. 51 19. 15 17. 41 17. 76 17. 15 17. 85 IS. OS 18. 74,17. 66 17. 89 IS. 90 



4018. 



07|19. 

 0718. 



2516. 

 4217. 

 20,15. 



73 15.20 

 40 20. 48 



20.17 

 18. 15 

 18. 56 

 14.75 



21. 46 

 22.15 

 19.21 

 16.33 

 17.30 

 16. 95 



17. 82 



16.15 

 19.65 

 19.28 

 18.12 

 18.37 

 16.79 



18.06 



