CONTENTS 



Page 

 Evidence of Differentiation— Time of Differentiation — In Relation to Posi- 

 tion; Varietal Differences; Differences Induced by Cultural Treatment — 

 Abnormalities; Winter Stages — Summary. 



CHAPTER XI 



Surpluses and Deficiencies 194 



Surpluses — Nitrogen; Magnesium; Copper; Arsenic; Manganese; Other 

 Elements — Deficiencies — Nitrogen; Phosphorus and Potassium; Sulfur; 

 Iron; Magnesium and Calcium; Chlorine — Analysis of the Fertilizer Problem 

 — The FertiHzer Requirements of the Orchard. 



CHAPTER XII 



The Application of Nitrogen-carrying Fertilizers 204 



The Influence of Nitrogenous Fertilizers on Vegetative Growth — In Peaches; 

 in Apples; in Strawberries; Negative Results, Nitrogen not a Limiting 

 Factor — Influence of Nitrogen on Blossom-bud Formation — in Peaches; in 

 Apples — Influence of Nitrogen on the Setting of Fruit — Influence of Nitro- 

 gen on Size of Fruit — Influence of Nitrogen on Coior of Fruit — Influence of 

 Nitrogen on Yield — The Correlation Between Vegetative Growth and 

 Yield — Influence of Nitrogen on Composition and on Season of Maturity — 

 Summary. 



CHAPTER XIII 



Fertilizers, Other Than Nitrogenous, in the Orchard 218 



The Indirect Effects of Fertilizers — Phosphoric Acid; Sulfur; Lime — 

 Plant Nutrient Carriers, Different Forms of Fertilizers — Nitrogen from 

 Inorganic Sources; Nitrogen from Organic Sources; Phosphorus; Potassium; 

 Sulfur; Lime — Season for Applying Fertilizers — The Relations of Seasonal 

 Conditions to Response From Fertilizers — Summary. 



SECTION III 



Temperature Relations of Fruit Plants 



CHAPTER XIV 



Growing Season Temperatures 236 



Heat Units — The Relative Values of Different Effective Temperatures — 

 Influence of Latitude on Heat Requirements — In the Early Harvest Apple; 

 in the Elberta Peach; in Chestnut Blight — Variations in Heat Requirements 

 from Season to Season — Acclimatization to Varying Amounts of Heat — In 

 General — Optimum Temperatures— Variation within the Species or Variety; 

 Differences within the Variety for Separate Processes; Variation in Quality 

 with Amount of Summer Heat; Variation in Season of Maturity with 

 Amount of Summer Heat — Soil Temperatures — Indirect Temperature 

 Effects — Summ ary . 



