FERTILIZERS FOR COTTON 5! 



Commercial fertilizers cannot be bought in 

 a pure state, but in combination with other 

 substances which are of no value except to 

 increase the bulk and make it easier to dis- 

 tribute. The farmer should, by all means, 

 know that the value of a fertilizer depends 

 not on gross weight, but on the amount of 

 available plant food contained. No fertilizer 

 should be purchased that does not have the 

 guaranteed analysis printed on the package. 

 The composition is given in percentages, and 

 in each hundred pounds there should be so many 

 pounds of the particular element mentioned. 



For example, a fertilizer is offered for sale 

 branded as follows: 



Nitrogen . 2 per cent. 



Water-soluble phosphoric acid .... 8 per cent. 



Citrate-soluble phosphoric acid ... 2 per cent. 



Total available phosphoric acid 10 per cent. 



Potash . 2 per cent. 



Translated into terms of pounds this means 

 that in a sack weighing 100 pounds there are: 



2 pounds of nitrogen. 



8 pounds of water-soluble phosphoric acid. 

 2 pounds of citrate-soluble phosphoric acid 

 10 pounds of available phosphoric acid. 

 2 pounds of potash. 



