74 FUNDAMENTALS OF AGRICULTURE. 



vegetables and fruits that will stand shipping, as pot- 

 ash is present in the stems and leaves of plants. 



Fertilizers for the Crop and the Soil. Every 

 farmer should set aside plats of ground and run experi- 

 ments and determine for himself the requirements of 

 his land for the crops he wishes to raise. To secure 

 the best results it is necessary that the soil be kept in 

 good physical condition. The soil should be kept well 

 drained and open; apply the proper fertilizers at the 

 right time; purchase fertilizers as set forth by the 

 guarantee, and buy those fertilizers which furnish the 

 greatest amount of plant food for the least money. 



EXERCISE. How much fertilizer do your folks use? What kinds 

 of fertilizers do they apply and for what crops? Do they ever add 

 nitrate of soda or sulphate of ammonia, in the early spring? For 

 what crops ? 



REFERENCES FOR COLLATERAL READING. 

 MANURES AND FERTILIZING MATERIALS. 



Yearbooks of the U. S. Dept. of Agriculture : 



1895 Soil ferments importance in agriculture. 



1895 Humus in its relation to soil fertility. 



1896 Potash and its function in agriculture. 



1902 Fertilizers for special crops. 

 Farmers' Bulletins, Nos. : 



44 Commercial fertilizers. 



192 Barnyard manure. 



222-225 Home mixing of fertilizers. 



245 Renovation of wornout soils. 



278 Leguminous crops for green manuring. 



327 Conservation of natural resources. 



342 Conservation of soil resources. 

 Experiment Station Bulletins, Nos. : 



94 New York, Geneva Composition and use of fertilizers. 



113 Louisiana, 123 Texas, 133 Indiana, Commercial fertili- 

 zers. 



123 Illinois Fertility in Illinois soils. 



129 Illinois Circular The use of commercial fertilizers. 



140 Kentucky Fertilizers. 



182-183 Ohio The maintenance of fertility. 



49 Georgia State Board of Agriculture Fertilizers. 

 Books : 



Fertilizers Voorhees The Macmillan Co., New York City. 



Soils and Fertilizers Snyder The Macmillan Co., New York 

 City. 



The Fertility of the Land Roberts The Macmillan Co., New 

 York City. 



Soils Fletcher Doubleday, Page & Co., New York City. 



