matters relative to the registration of brands should be addressed to his office. 



The value of a fertilizer depends mainly upon its content of available plant 

 food, particularly nitrogen, phosphoric acid and potash. To correct certain soil 

 conditions other plant nutrients are included in fertilizers for specific crops. 

 Magnesium and boron are two so-called minor elements or plant foods furnished 

 by some brands of fertilizers for specific cases. Whether or not a fertilizer 

 contains the guaranteed amount of plant food can be determined only by a 

 chemical analysis. For this reason it is considered necessary that each brand 

 of fertilizer offered for sale be officially sampled and analyzed each year. When 

 failure to meet the guarantee is proved by chemical analysis, the prosecution 

 or seizure provisions of the law may be invoked. The purchaser's refusal to buy 

 a fertilizer which does not conform to the law will not only assist in the enforce- 

 ment of the law but will at the same time insure him the protection of the law. 



USE OF COMMERCIAL FERTILIZERS 



It is not within the scope of this bulletin to make recommendations regard- 

 ing the use of commercial fertilizers. The Department of Agronomy and the 

 Department of Agricultural and Biological Chemistry of the University of New 

 Hampshire Agricultural Experiment Station test soils and conduct experimental 

 work with various fertilizer materials on hay and crop land. The Department of 

 Horticulture investigates fertilizer treatments for fruits and vegetables. Much 

 of this work has been published, and is available for free distribution to residents 

 of New Hampshire. Address your request to Mail Service, University of New 

 Hampshire, Durham, New Hampshire. 



Fertilizer Experiments with Sweet Clover. 12 pp. 



Fertilizer Experiments with Hay Lands in the Connecticut Val- 

 ley. 15 pp. 



Fertilizer Needs of Alfalfa on New Hampshii'e Soils. 12 pp. 



Effect of Soil Moisture and Fertilizer Placement on Vitality of 

 the Potato Seed Piece. 11 pp. 

 Sta. Cir. 61 Fertility Needs of Dairy Farm Crops in the Connecticut Valley. 



12 pp. 



Fertilizers for Sweet Corn. 8 pp. 



The Response of Clover and Total Forage to Top-Dressing Fer- 

 tilizers. 12 pp. 



Experiments with Grass Hay. 24 pp. 



Pasture Top-Dressing in New Hampshire. 24 pp. 



Experiment with Potatoes. 38 pp. 



Purchasing Fertilizers in New Hampshire. 31 pp. 



Asparagus Culture. 4 pp. 



Grape Growing in New Hampshire. 11 pp. 



Pui'chasing Lime and Fertilizer. 12 pp. 



Cabbage. 4 pp. 



Tomatoes for Good Health. 8 pp. 



Root Crops. 20 pp. 



The Home Vegetable Garden. 20 pp. 



Culture of Low-Bush Blueberries. 16 pp. 



Strawberi-y Culture. 4 pp. 



Forage Production and Grain Saving. 8 pp. 



Cane Fiuit Culture. 8 pp. 



Potato Growing in New Hampshire. 32 pp. 



Home Fruit Growing in New Hampshire. 16 pp. 



