BIBLIOGRAPHY 



195 



2. To what extent may erosion cause damage to (i) crop production, 

 (2) personal and other property, (3) roads, trails, etc.? 



3. To what extent may melting snow cause erosion on hilly lands? 



4. (a) Is rainfall or the run-off from melting snow more influential in causing 

 erosion? (b) To what extent is the degree of erosion and run -off influenced 

 by the following factors: (i) Rate at which the rain falls, (2) steepness of 

 the slope, (3) presence of well-established gullies, (4) character of the soil. 

 (5) density and character of the vegetation? 



5. Since man has little control over climate and topography, by what 

 means is he able largely to control erosion? 



6. To what extent do erosion and the depletion of the soil resulting there- 

 from influence the tj^e of vegetation and the luxuriance of its growth? 



7. (a) How does erosion affect the plant foods in the soil? (b) How does 

 erosion influence the potential crop-producing capacity of the soil? 



8. (a) Compare the amount of water required for the production of one 

 pound of dry vegetable matter of a given species grown on an eroded soil 

 with that required on a noneroded soil? (b) Compare the amount of water 

 available for plant growth in a given volume of eroded soil with that in a 

 noneroded soil? 



9. Name five precautions to be observed in the handling of pasture lands 

 that are subject to more or less serious erosion. 



10. Where revegetation through the application of the deferred-grazing 

 system is not effective, what treatment of the lands may prevent erosion? 



11. (a) Where terracing and planting are justified to prevent erosion, 

 explain how the terraces should be built and how far apart they should be 

 placed, (b) To what extent should stock be permitted to graze on areas so 

 seriously eroded that terracing is necessary? 



BIBLIOGRAPHY 



Baker, W. H. The Soil-Saving Dam. Mo. Agr. Ext. Service Cir. 14, 191 7. 

 Carpenter, John W., and Gross, E. R. The Terrace in Mississippi. 



Miss. Agr. Exp. Sta. Extension Bui. 9, 1918. 

 Clements, Frederic E. Plant Succession: An Analysis of the Develop- 

 ment of Vegetation. Carnegie Institution of Wash., Pub. No. 



242, 1916. 

 Dana, S. T. Farms, Forests, and Erosion. U. S. Dept. of Agr. Yearbook, 



1916. 

 Davis, R. O. E. Soil Erosion in the South. U. S. Dept. of Agr. Bui. 180, 



1915- 

 Ramser, C. E. Gullies: How to Control and Reclaim Them. U. S. Dept. 



of Agr. Farmers Bui. 1234, 1922. 

 Reynolds, R. V. R. Grazing and Floods: A Study of Conditions in the 



Manti National Forest, Utah. U. S. Dept. of Agr., Forest Service, 



Bui. 91, 1911. 



