10 CONTENTS 



PART IV MISCELLANEOUS CROPS 

 CHAPTER XXII 



Page 



Root and Tuber Food Crops. The Potato: Importance, 

 Soils and Fertilizers, Production, Marketing, Improvement. The 

 Sweet Potato: Description, Importance, Method of Production. 422 



CHAPTER XXIII 



Sugar Plants. The Sugar Beet : Importance, Culture, Manu- 

 facture of Sugar, By-Products, Sugar Cane: Characteristics, 

 Propagation, Soils, Production, Making the Sugar 451 



CHAPTER XXIV 



Fiber Plants. Cotton: Description, Varieties, Importance, 

 Production, Soils and Fertilizers, Crop Management, Marketing, 

 Insects, and Diseases. Flax. Hemp 463 



CHAPTER XXV 



Tobacco. Characteristics. Production. Soils and Fertilizers. 

 Crop Management. Curing and Marketing 487 



PART V CONCLUDING CHAPTERS 



CHAPTER XXVI 



Rotation of Crops. Advantages. Effect on Physical Condi- 

 dition of Soil. Keeping down Weeds. Effect on Crop Yields. 

 Distribution of Farm Labor. Relation to Soil Fertility. Classes 

 of Crops. What Crops to Grow. Application of Manure. Rota- 

 tions for Different Sections 503 



CHAPTER XXVII 



Weeds. Classes of Weeds. Damage from Weeds. Benefits 

 from Weeds. How Weeds Spread. Methods of Eradication 522 



