xvi CONTENTS 



Rotation an Essential Factor in Successful Farm Manage- 

 ment: (a) Aids in maintaining and increasing fertility. 

 (6) Systematizes farm operations, (c) Aids in solving soil 

 and crop problems. 4. Crop Rotation in Practical Farming. 

 5. Factors Which Determine Kinds of Rotations. 6. How 

 to Plan Rotations: (a) When a farm is already stocked. 

 (6) For a stock farm not yet stocked, (c) For a grain farm 

 having soil problems, (d) For a truck farm having soil 

 problems. 7. Rotations Application and Illustrations. 

 8. Other Points on Crop Rotation. 



XXI. SYSTEMS OF FARMING AND THEIR RELATION TO SOIL FERTILITY 343 

 1. Systems of Farming Grain, Stock, Truck and Combina- 

 tion. 2. Grain Farming vs. Stock Farming: (a) Grain 

 farming is important. (6) Grain farming has led to soil 

 depletion, but revised, (c) Stock farming is popular, (d) 

 Maintaining fertility by stock farming not probable, (e) 

 Possible to maintain fertility by either grain or stock farm- 

 ing. (/) Combination of grain and stock farming popular. 



f\ A_ A j_ TTT"il i 1 TVI , f t T-11 , ~r^ 



of the plant-food elements in farming, (c) Rules for deter- 

 mining losses and gains, (d) The nitrogen-phosphorus 

 balance sheet. 



OTHER POINTS ON. SOIL MANAGEMENT 



XXII. How THE NEEDS OF SOILS MAY BE DETERMINED 355 



1. Chemical Analysis has Limitations. 2. Other Factors 

 to be Considered First Before Chemical Analysis is Made 

 of Soil. 3. Chemical Analyses and Their Value: Need of 

 Lime, Tests for Nitrogen, Phosphorus and Potassium. 

 4. Pot Tests Not Fully Reliable. 5. Field or Plot Tests 

 Are Most Reliable: (a) Scientific tests by Experiment 

 Stations. (6) Practical tests by farmers. 6. Value of 

 Farm Examinations. 



XXIII. PROFITABLE CROP PRODUCTION 369 



1. Large Crops not Necessarily the Most Profitable. 2. 

 Profitable Crop Production Determines Successful Farming. 



3. Profits Determine Fertilizer Practice. 4. Important to 

 Determine the Point at Which Crop Production is Most 

 Profitable. Value of Untreated Plot. 5. Proper Basis for 

 Determining Most Profitable Fertilizer. 6. Proper Kind and 

 Amount of Fertilizers Important : (a) Application of the law 

 of the minimum, (b) Application of the law of diminishing 

 returns. 7. Factors Favoring Greatest Profits Per Acre: 

 (a) When soil is properly fertilized. (6) When high crop 

 prices prevail. 



XXIV. FARMING IN REGIONS OF LIMITED RAINFALL 377 



1. Dry-farming of Much Importance. 2. Water Problem 

 and Soils. 3. Farming Methods Summary of Results. 



4. Crops for Dry-land Farming. 5. Dry-farming Practices. 

 6. Stock in Dry-land Farming. 7. Good Farming is Essen- 

 tial to Successful Farming Everywhere. 



APPENDIX . . 383 



