Helpful Hints 



1. Reinforce stable manure with 2 lbs. of 20 r /< superphosphate per cow per day. 



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

 it is desirable to apply at least V* to % of the above amounts of commercial 

 fertilizers 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 

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

 hundred pounds of ammonium nitrate is approximately equal to 160 pounds 

 of ammonium 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 dolomite 

 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 samples analyzed 120 



Equalling or exceeding all guarantees 69 



Deficient in nitrogen only 22 



Deficient in available phosphoric acid only 9 



Deficient in potash only 7 



Deficient in nitrogen and phosphoric acid 3 



Deficient in nitrogen and potash 4 



Deficient in phosphoric acid and potash 5 



Deficient in nitrogen, phosphoric acid and potash 1 



Sixteen brands were guaranteed to contain magnesium oxide. One 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 segre- 

 gation will be prevented. The problem has not been satisfactorily solved as yet. 

 To obtain 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 guaranteed 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 type. The names of the manu- 

 facturers are arranged alphabetically. The brand names are listed alphabetically, 

 or numerically by formula, under the manufacturer. 



