REFERENCES ON ROTATIONS 521 



been adopted. One which may be followed in the irrigated 

 districts embraces three or four successive crops of alfalfa, 

 followed by one or two crops of potatoes or sugar beets and 

 perhaps one or more of barley, wheat, or oats, when the land 

 is again seeded to alfalfa. In California, on the dry lands 

 where grain is grown, a more or less definite sequence of 

 wheat, barley, and oats is sometimes followed, but rotations 

 which embrace all the desirable features are little known. 



LABORATORY EXERCISES 



1. Draw a plan of the home farm or of some farm in the neighbor- 

 hood and show the crops which are now grown on it. If a definite 

 rotation is now followed, tell whether it is a good one. If it is not, show 

 how it may be improved to more nearly meet the four essentials of a good 

 rotation. If no rotation is followed, plan one which is suitable for the 

 type of farming which is followed. 



2. Plan a three-year rotation, using the more important crops 

 of your community and taking care that the four essentials are included. 

 In the same way, plan four-year and five-year rotations. 



3. Plan a rotation which will be suitable for a dairy farm in your 

 section; for a hog and beef -cattle farm; for the production of the leading 

 cash crop. 



SUPPLEMENTARY READING 



Farmers' Bulletins: 



242. An Example of Model Farming. 



272. A Successful Hog and Seed-Corn Farm. 



312. A Successful Southern Hay Farm. 



325. Small Farms in the Corn Belt. 



326. Building up a Run-Do wn Cotton Plantation. 

 337. Cropping Systems for New England Dairy Farms. 

 355. A Successful Poultry and Dairy Farm. 



454. A Successful New York Farm. 



Bailey's Cyclopedia of American Agriculture, Vol. II, pp. 81-109. 

 Burkett's Farm Crops, pp. 16-26. 

 Hays' Farm Development, pp. 96-116. 

 Hopkins' Soil Fertility and Permanent Agriculture, pp. 226-235. 



