CONTENTS 



OHAFTEE PAGKS 



I. Acreage, Distkibution, Pkodhction and Valu- 

 ation 1-13 



II. HiSTOKT 14-20 



III. Classification and Botanical Chahacteeistics . 21-46 

 Description of the Irish potato — Classification 

 of varieties — Important varieties of Iowa and 

 the Central "West — Tabulation of varieties — 

 Synonyms — Description of typical varieties. 



rV. Potato Breeding 47-85 



Ideals for the potato crop — Use of score card 



— Possibilities of improving the potato — Meth- 

 ods of improvement — Improvement of the potato 

 by selection — Running out of varieties — Ap- 

 pearance of bud sports — Improvement by hy- 

 bridization. 



V. Climate, Soils and Rotation .... 86-112 

 Factors influencing potato culture — Heat — 

 Water requirements — Soil texture — Available 

 plant-food — Drainage and soil air — Critical 

 period — Type, variety and strain — Diseases — 

 General types of potato-growing in the United 

 States — Soils — Rotation — Hay plants. 



VI. Manures and Fertilizers 113-132 



Fertilizer practices — Market forms of fer- 

 tilizers — Nitrogen — Phosphorus — Potassium 



— Calcium — Sulphur — Applying fertilizers — 

 Farm manures. 



vii 



