Helpful Hints 



1. Reinforce stable manure with 2 lbs. of 20% superphosphate per cow per day. 



2. Even though manure may replace some of the commercial fertilizer used, it is 

 desirable to apply at least 14 to i/, of the above amounts of commercial fer- 

 tilizers in order to hasten early spring growth. 



3. One ton of cow manure as it comes from the stable is approximately equal to: 

 50 cubic feet; 40 bushels; 0.4 cords. 



4. Small and frequent applications of manure are more effective than is the same 

 amount of manure applied in larger amounts and less frequently. 



5. Equivalent amounts of other nitrogen fertilizers may be substituted for am- 

 monium nitrate, although at a greater cost per pound of nitrogen. One hundred 

 pounds of ammonium nitrate is approximately equal to 160 pounds of am- 

 monium sulfate or 200 pounds of nitrate of soda. 



6. If the soil test indicates a need for lime, then apply lime well in advance of 

 adding fertilizers so as to make the fertilizers more effective. 



7. Since New Hampshire soils are low in magnesium, it is best to use dolomitic 

 limestone which contains magnesium. 



CONFORMITY TO GUARANTEE 



The chemical analyses reported in this bulletin were made by the methods 

 adopted by the Association of Official Agricultural Chemists. 



Number of brands analyzed 123 



Equalling or exceeding all guarantees 52 



Deficient in nitrogen only 33 



Defiicent in available phosphoric acid only 24 



Deficient in potash only 4 



Deficient in nitrogen and phosphoric acid 2 



Deficient in nitrogen and potash 5 



Deficient in phosphoric acid and potash 2 



Deficient in nitrogen, phosphoric acid, and potash 1 



Fourteen brands were guaranteed to contain magnesium oxide. None failed to 

 meet the guarantee. 



Fertilizers are largely mixtures of highly purified chemicals. Segregation of 

 these materials in the bag is difficult to prevent. Modern methods of fertilizer 

 manufacture are doing much to process the fertilizer in such a way that segregation 

 will be prevented. The problem has not been satisfactorily solved as yet. To ob- 

 tain a truly representative sample of a fertilizer mixture requires careful work. 

 The chemist can accurately determine the nitrogen, phosphoric acid, and potash 

 content of the sample sent to the laboratory. If this sample does not correctly 

 represent the larger lot, the analytical work is of no use. The obligation of the 

 fertilizer control program is to see that the manufacturer is supplying the guaran- 

 teed amount of plant food to the consumer. For this reason the sample must be 

 drawn and analyzed very carefully so that injustice will not be done to either the 

 consumer or manufacturer. 



In the tabulation of the analyses in the following pages, deficiencies of one- 

 half of one per cent or more are shown in red ink. The names of the manufac- 

 turers are arranged alphabetically. The brand names are listed alphabetically, or 

 numerically by formula, under the manufacturer. 



