xvi CONTENTS 



Rotation an Essential Factor in Successful Farm Manage- 

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

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

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



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. (<^) For a truck farm having soil 

 problems. 7. Rotations — ^Application and Illustrations. 

 8. Other Points on Crop Rotation. 



XXI. Systems op 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. (5) Grain farming has led to soil 

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

 Maintaining fertihty by stock farming not probable, (e) 

 Possible to maintain fertility by either grain or stock farm- 

 ing, (f) Combination of grain and sto6k farming popular. 

 3. An Account With the Plant-food Elements in Farming: 

 (a) Nitrogen and phosphorus balance indicative of good 

 farming. (6) Diagram showing sources of loss and gain 

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

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

 balance sheet. 



OTHER POINTS ON SOEL MANAGEMENT 



XXn. How the Needs op 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. (5) Practical tests by farmers. 6. Value of 

 Farm Examinations. 



XXin. Profitable Crop PRODUCTioisr 369 



1. Large Crops no.t Necessarily the Most Profitable. 2. 

 Profitable Crop Production Determines Successfiil Farmiag. 



3. Profits Determine Fertilizer Practice. 4. Important to 

 Dete r mine 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) AppMcation of the law 

 of the minimum. (6) AppMcation of the law of diminishing 

 returns. 7. Factors Favoring Greatest Profits Per Acre: 

 (a) When soil is properly fertifized. (5) 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. Farmiag 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 



