18 



BULLETIN 157, U. S. DEPARTMENT OF AGRICULTURE. 



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

 on cultivated and uncultivated follow at the Nephi substation, samples taken in spring, 

 summer, and fall, for the years 1909 to 1912, inclusive. 



FALLOW CULTIVATED FORMALLY. 



Date of determination. 



1909 



Depth of sampling. 



1910 



Average. 



1 foot. . 



2 feet.. 



3 feet.. 



4 feet.. 



5 feet . . 



6 feet.. 



Average - . . 



19. 22 16. 35 17. 15 

 19.6019.65 16.55 

 19.50H9.50 18.85 18.95 



19. 40 18. 90 18.701 19. 33 

 18. 20 18. 00 18. 05119.05 

 20.00 20.30 19. 35 i 19. 30 



14. 50 16. 05 13. 53 18. 82 17. 39 12. 52 



18. 20J18. 80 19. 35 19. 69 19. 53 17. 74 



" " 17. 85 18. 03 18. 65 19. 63 17. 72 



.. 19.32 18.7818.1118.22 



21.67 

 22.06 

 20. 05 



14. o; 



19. » 



14.47 IS. 55 

 18.8819.89 



19. a3 18. 68 14. 95 IS. SO 10. 50 13. 32 



18.33 19.15 13.4120.8015.31 

 18. 80 18. 45 17. 44 17. 60 17. 89 



18. 2417. 86 17. 16J18. 96 16. 29 



18.4717.85 19.2918, 

 14. 20 14. 10 16. 75 

 10. 95 12. .53 15. 28 



10.44 



15. 85113.92 13. 54 18. 15 



17.23 15.25 15.23 17.98 



15. 97 14. 42 

 19.4618.13 

 i 18. 11 

 17. 88 17. 01 



17.0216.26 



17. 81 16. 8 



FALLOW XOT CULTIVATED. 



lfoot 



2 feet 



3feet 



4 feet 



5 feet 



6 feet 



Average 



18.6012.6512.3012.8510.45 8.05 20.0012.83 9.6120.4710.68 7.9517.9811. 

 19. 3015. 80 13. 20 17. 37 14. 05 12. 23 20. 16 14. 99 12. 98 20. 75 12. 36 11. 46 19. 30'l4. 

 20. 4516. 55 14. 15 19. 10 13. 28 11. 78 17. 88 17. 08 12. 2817. 21 12. 91 11. 1818. 66,14. 

 19. 3517. 55 15. 25 18. 93 13. 80, 10. 38 12. 03 14. 89 11. 61 10. 83 11. 35 10. 74 15. 2914. 

 19. 05 18. 15 16. 15 19. 35 16. is, 13. 45 11. 10 13. 94 11. 20 11. 27 14. 47 11. 86 15. 19|l5. 

 20. 57 20. 42 18. 95 19. 10 16. 63 15. 33 13. 10 18. 11 12. 06 14. 17 15. 76 12. 27 16. 74 



65 9.32 

 30112.47 

 96|12.35 

 4012.00 



19. 55 16. 85 15. 00 17. 79 14. 00 11. 87 15. 71 15. 31 11. 62 15. 78 12. 92 10. 9117. 20 



14.79 



13.17 

 14.65 



12.34 



Table VI shows that the moisture content of the plats was practi- 

 cally uniform in the spring, but that the differences increased 

 as the season advanced. The moisture in the cultivated plat re- 

 mained practically the same throughout the season, while that of 

 the uncultivated plat rapidly decreased until by fall it was reduced 

 to a comparatively low point. The first 4 feet seemed to lose more 

 moisture than the fifth and sixth. These data are shown graphically 

 in figures 9, 10, and 11. The fact that the moisture content of the 

 second, third, and fourth feet of the uncultivated plat was reduced 

 practically as much as on any of the cropped plats sampled suggests 

 that a great deal of the moisture loss from the uncultivated plat was 

 due to the growth of weeds and volunteer grain. 



YIELD OF GRAIN. 



The difference in the soil-moisture content of the plats, as shown 

 in Table VI and figures 9, 10. and 11, is reflected in the yields obtained. 

 These are reported in Table VII and are compared graphically in 

 figure 12. It will be noticed that there is a difference of 4 bushels 

 per acre in the average yield for the four years in favor of the culti- 

 vated plats. This difference is more than enough to pay for the cul- 

 tivation of the fallow. 



