XII Journal of Agricultural Research voi.x 



Page 



Fig. 8. Diagram showing the effect of different quantities of irrigation water 

 on the distribution of moisture before and after irrigation to a depth 



of lo feet 126 



9. Diagram showing the effect of mulches under irrigation on the distri- 

 bution of soil moisture to a depth of 10 feet 127 



10. Diagram showing the'effect of mulches under dry-farming conditions 



on the average distribution of soil moisttire to a depth of 6 feet 128 



11. Diagram showing the effect of cultural methods under dry-farming con- 



ditions on the average final content, of moisture in the soil to a 

 depth of 6 feet. Each column is an average of 240 samplings 129 



12 . Diagram showing the effect of spring and fall plowing under dry-farming 



conditions on the distribution of moisture in the spring, summer, 



and fall, to a depth of 6 feet 130 



13. Diagram showing the effect of dry-farming seasonal conditions on the 



distribution of moisture in fallow soil to a depth of 6 feet on (i) May 

 22-29, (2) June 6-10, (3) June 16-20, (4) June 26-28, (5) July 12-15, 

 (6) July 17-19, (7) July 27-29, (8) August 7-9, (9) August 17-19, 

 (10) August 28-30, 1916. Tlie numbers i to 10, etc., refer to the 

 columns in the diagram, which were sampled on the dates noted. 

 Each column is the average of 24 samplings 131 



14. Diagram showing the effect of the initial percentage of moisture and 



time on the upward capillary movement of water 132 



15. Diagram showing the effect of the initial percentage of moisture and 



time on the downward movement of water after an 8.66-inch irri- 

 gation 133 



16. Diagram showing the effect of the initial percentage of moisture on the 



downward distribution of moisture in soils after the application of 

 varying quantities of irrigation water 134 



17. Diagram showing the effect of varying initial percentages of water on 



the horizontal distribution of moisture in drier soils in contact with 

 a wet soil having 24.36 per cent of water. The top line of each 

 series represents the original distribution 135 



18. Diagram showing the effect of varying initial percentages of water 



on the horizontal distribution of moisture in drier soils in contact 

 with a wet soil having 24.36 per cent of water. The top line of each 

 series represents the original distribution 136 



19. Diagram showing the effect of var>dng initial percentages of water on 



the horizontal distribution of moisture in drier soils in contact vfith 

 a wet soil having 28.44 P^r cent of water. The top line of each series 

 represents the original distribution 137 



20. Diagram showing the effect of the initial percentage of water on the 



final moisture content of soils in contact with a wet loam having 

 30.45 per cent of water 139 



21. Diagram showing a comparison of the rate of capillary movement of 



moisture upward and downward through air-dry Greenville loam 



with a varying moisture content in the source of supply 140 



22. Diagram showing the average final distribution of moisture which 



moved upward and downward by capillarity through Greenville 

 loam, air-dried, with a varying moisture content in the sotu-ce of 

 supply 141 



23. Diagram showing the effect of gravity on the quantity of water moved 



by capillarity through Greenville loam from similar soil containing 

 30.25 per cent of water as the source of supply 142 



