i86 FARM AND SCHOOL PROBLEMS. 



13. The market demand for certain products that command a high 

 price and therefore result in high profits, has often discouraged 

 the use of crop-rotation. 



14. Fertilizing material may be relatively cheap in comparison with 

 crop-rotation for enriching soils with nitrogen for garden or 

 trucking purposes and in such a case rotation should not be 

 recommended. 



15. The successful production of our great staple crops, corn, 

 wheat, oats, cotton and some of the minor products will probably 

 always depend upon a scientific rotation of crops. 



Questions. 



1. Do you follow rotatio'n of crops on the home farm? 



2. Does a difference in the size of fields obstruct rotation? Explain. 



3. In regions where spring grains are grown extensively, what are 

 some of the troubles likely to be experienced by continuous cropping? 



4. How does rotation effect the existence of the chinch-bug, the 

 clover midge, the corn root louse, the corn root worm, potato scab, and 

 similar pests and diseases? 



5. Under what conditions of farming do Russian thistles, Canada 

 thistles, wild rose bushes, wild mustard, wild oats, and similar pests seem 

 to thrive? 



6. What other methods are there of treating crops for fungus 

 diseases besides rotation of crops? 



7. Compare the root system of a corn plant with that of an alfalfa 

 plant. 



8. Which should come first in a rotation? Corn or Alfalfa? 



Books for Collateral Reading. 



1. The Cereals in America Hunt, 8-12 Webb Pub. Co $1 75 



2. Forage and Fiber Crops in. America Hunt, 8-12 Webb Pub. Co. 1 75 



3. The Fertility of the Land Roberts, 8-12 Macmillan Co 1 50 



4 . Forage Crops Vorhees, 8-12 Macmillan Co 1 50 



5. Three Acres and Liberty Hall, 8-12 Macmillan Co 1 75 



6. Ten Acres Enough Roberts, 8-12 Webb Pub. Co 1 00 



7. Our Farm of Four Acres Webb Co., 8-12 Webb Pub. Co 30 



FARMERS' BULLETINS, u. s. DEPT. OF AGRICULTURE. 

 Number. 



337. Cropping Systems for New England Dairy Farms. 

 144. Rotation of Crops. 

 98. Suggestions to Southern Farmers. 

 280. Practices in Crop Rotation. 

 320. Relation of Sugar Beets to General Farming 



