256 SOIL PHYSICS AND MANAGEMENT 



15. Give the advantages of wheat for the dry-land farm. 



16. Why is a fall or winter variety more desirable than a spring-sown one? 



17. What special advantages has corn for semi-arid regions? 



18. Why is alfalfa a good dry-hind crop? How is a seed crop produced? 



19. What precautions must be taken in seeding the crop in dry-land 



farming? 



20. What is meant by acclimated seed? Why is it important? 



REFERENCES 



1 Widtsoe, J. A., Dry Farming, 1911, p. 132. 



* Brigga, L. J., and Shantz, H. L., Journal of Agricultural Research, vol. 



Ill, No. 1, 1911, pp. 58-<50. 



I Wiltsoe, J. A., Dry Farming, 1911, p. 185. Principles of Irrigation Prac- 



tice, 1914, p. 141. 



4 Rotmistrov, V. G., Nature of Drought, English edition, 1913. 

 "Merrill, L. A., A Report of Seven Years' Investigation of Drv Farming 



Methods, 1910, p. 133. 



Widteoe, J. A., Dry Farming, 1911, p. 114. 



T Atkinson, A., and Nelson, J. B., Bulletin 74, Montana Station, 1908, p. 83. 

 "Thysell, J. C., and others, Bulletin 110, North Dakota Station, 1915, 



pp. 183-185. 



Jardine, W. M., Circular 12, Bureau of Plant Industry, V. S. D. A., Dry- 



Land Grains, 1908, p. 6. 



"Merrill, L. A., Bulletin 112. Utah Station, A Report of Seven Years' Inves- 

 tigation of Dry Farming Methods, 1910, p. 139. 



II Op. Cit., p. 138. 



"Cottrell, H. M., Bulletin 145, Colorado Station, Dry-Land Farming in 

 Eastern Colorado, 1910, p. 23. 



General References. Olin, W. H., Bulletin 103, Colorado Station, 

 The Thorough Tillage System for the Plains of Colorado, 1905. Failyer, 

 G. H., Farmers' Bulletin 266, U. S. D. A., 1906. Jardine, W. M., Bulletin 

 100, Utah Station, Arid Fanning Investigations, 1906. Scofield. C. S., 

 Bulletin 103, Bureau of Plant Industry, Dry Farming in the Great Basin. 

 1907. Campbell, H. W., Soil Culture Manual, 1907, Lincoln. Neb. Nelson, 

 Elias, Bulletin 62, Idaho Station, Dry Farming in Idaho, 1908. Burr, 

 W. W., Bulletin 114, Nebraska Station, 'Storing Moisture in the Soil, 1910. 



