Agricultural experiment stations and industrial research groups are constantly 

 studying the needs of the soil to improve crop yields. As a result of these studies, 

 other plant nutrients are included in certain fertilizers for specific crops. Mag- 

 nesium and boron are examples of so-called minor elements furnished by some 

 brands of fertilizer to correct specific deficiencies of the soil in certain localities. 



All control officials charged with the enforcement of state laws regulating 

 the sale of commercial fertilizers and fertilizer materials, are joined in the Asso- 

 ciation of American Fertilizer Control Officials. Research workers employed by 

 State or Federal Agencies engaged in the investigation of fertilizers are also mem- 

 bers of this Association. The object of this organization is to "promote uniform 

 and effective legislation, definitions, rulings and enforcement of laws relating to 

 the control of sale and distribution of mixed fertilizers and fertilizer materials 

 in the Continent of North America." Annual meetings of this Association are 

 held at which reports and recommendations of investigators concerning defini- 

 tions of fertilizer materials, use of new products, and problems concerning regu- 

 lation of the fertilizer trade are discussed in detail. Fertilizer manufacturers are 

 invited to participate in these discussions and through mutual cooperation the 

 farmer is supplied with a product that can be relied upon to do the job expected 

 in crop production. The Official Publication of the Association may be obtained 

 for a small fee through the office of its secretary, B. D. Cloaninger, Clemson, South 

 Carolina. This booklet contains the official terms describing fertilizer materials, 

 a proposed model state fertilizer law as well as the proceedings of the annual 

 meeting. 



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 enforcement 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. 



Sta. Cir. 58 Fertilizer Needs of Alfalfa on New Hampshire Soils. 12 pp. 



Sta. Cir. 59 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 



Fertilizers. 12 pp. 

 Experiment with Potatoes. 38 pp. 

 Purchasing Fertilizers in New Hampshire. 31 pp. 

 Purchasing Lime and Fertilizer. 12 pp. 

 Cabbage. 4 pp. 



