EXERCISE 16 (Continued) 



Questions. Which soil absorbs water most readily? What is the effect of a surface mulch upon the 

 amount of water which penetrated the soil ? Which soil permits the most rapid percolation ? " How 

 may tillage be utilized to increase the absorption of water by soils ? What is meant by gravitational, or 

 free, water ? What is meant by the water table of a soil, and what factors determine its height ? 



References. Waters, H. J. Essentials of Agriculture, pp. 64-66. Ginn and Company. Roberts, I. P. 

 The Fertility of the Land, pp. 72-80. The Macmillan Company. Lyon, Fippin, Buckman. Soils, their Proper- 

 ties and Management, pp. 264-265, 279, 713. The Macmillan Company. Burkett, C. W. Soils, pp. 167-168. 

 Orange Judd Company. Mosier and Gustafson. Soil Physics and Management, pp. 217-222. J. B. Lippin- 

 cott Company. 



RECORD OF RESULTS 





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