244 SOILS 



it is available nitrogen, phosphorus, and potassium that 

 you are after, and not high-sounding names or spread-on 

 analyses. 

 The following is an example of such : 



Moisture 10 to 15.00 



Ammonia 2 to 2 . 25 



Available phosphoric acid 8 to 9.00 



Equivalent to bone phosphate of lime 20.74 to 24.01 



Insoluble phosphoric acid 1.25 to 2.00 



Total phosphoric acid 9.25 to n oo 



Potash 1.62 to 2. 16 



Equivalent to sulphate 11.80 to 13.72 



When this statement is reduced to its true meaning, it 

 reads as follows : 



Nitrogen 1 .64 



Phosphoric acid 8.00 



Potash i . 62 



And now another important truth in the purchase of 

 fertilizers : Pay no attention to anything printed on the 

 bag or tag, except to the nitrogen, to the available or solu- 

 ble phosphoric acid, and to the potash, and then use only 

 the lowest percentage as given for each element. Do this 

 and you will have a clear and correct statement of the real 

 value. 



Now, if you use fertilizers, just bear this in mind: 

 chemical fertilizers will not take the place of humus, 

 stable manure, and the legumes. You will use them 

 properly only when you consider them as supplementary 

 helps in the fertilization of your lands. The quicker you 

 realize that prescribed formulae are only general and that 

 you must use such as guides rather than as specifics, you 

 will the quicker profit in using chemical manures. If you 



