CONTENTS XV 



CROP PRODUCTION AFFECTED BY SYSTEMS OF CROPPING 



XV. Crop Rotation and Its Relation to Soil Fertility 263 



1. Crop Rotation Defined. Kinds of Rotation. One-Crop 

 System. 2. Why Crops Should be Grown in Rotation: 

 (a) Primary object to increase production and help main- 

 tain it. (b) Specific benefits of rotation: (1) Helps to con- 

 trol insect pests. (2) Helps to control certain plant diseases. 

 (3) Favors accumulating of soil organic matter. (4) Tilth 

 and workability of soils may be improved. (5) Rotation 

 helps to conserve fertilizing elements. (6) Aids in fertiliza- 

 tion and liming. (7) Weeds may be better controlled, (c) 

 Rotation helps to maintain and increase soil fertility. 

 3. Roration Can Not Take the Place of Fertilizers. 4. Fac- 

 tors Determining a Good Rotation, (a) Proper combina- 

 tion of crops. (5) Proper order in growing the crops. 5. 

 Crop Rotation Important in Soil Improvement. 6. Some 

 Practical Rotations. 7. Rotations for Truck Farming and 

 Vegetable Growling. 



APPLICATION OF PRINCIPLES TO MANAGEMENT OF 



SPECIAL SOILS 



XVI. Soil Erosion 283 



1. Soil Erosion a Serious Problem. 2. Injmies Resulting 

 from Erosion. 3. Causes of Erosion. 4. ifinds of Erosion. 

 5. Prevention of Erosion. 6. Stopping W^ashing and Re- 

 claiming Eroded Lands. 



XVn. The Management of Marsh Lands 293 



1. Kinds of Marsh and Swamp Soils. 2. Advantages in 

 Farming Marsh Lands. 3. Problems in Peat and Muck 

 Management, and Solutions. 4. Crops for Marsh Lands. 

 Rotations. 5. Tj^pes of Farming for Marsh Lands. 



XVIII. Sands and Their Management 309 



1- Important Classes of Sandy Soils. 2. Advantages in 

 Farming Sands. 3. Problems in Sand Management and 

 How to Solve Them. 4. Crops for Sands. Crop Rotation. 

 B. Types of Farming. 



XIX. The Management of Clats and Depleted Silt Loams. ..... 321 



1. Clay Management: (a) Character of clay soils and 

 their advantages, (b) Important problems and their solu- 

 tions, (c) Crops for heavy clays, (d) Rotations and types 

 of farming. 2. Improvement of depleted silt loams: (a) 

 Liming a common first consideration, (h) Importance of 

 fertilizers and organic matter, (c) Proper rotation. 



PRINCIPLES OF SOIL FERTILITY APPLIED TO THE FARM 



AS A WHOLE 



XX. Farm Management and Crop Rotation 327 



1. Soil Problems are Important Farm-Management Prob- 

 lems. 2. Diversified Farming and Its Advantages: (a) It 

 economizes in the use*of labor. (5) A more dependable 

 income is assured, (c) It permits of crop rotation. 3 Crop 



