12 



opraent of leaf and fruit. Perhaps the best fertilizer for 

 fruit trees is a mixture of ground bone 3 parts and muri- 

 ate of potash two parts. An excess of nitrogen must be 

 avoided, as this causes a too rapid growth of both wood 

 and fruit, the latter ripening poorly under such condi- 

 tions. All fcrtilifers for fruit crops should be worked 

 well into the soil. 



CALCULATION OF COMMERCIAL VALUES OF FERTILIZERS. 



The schedule of valuations in force this season is as 

 follows : 



Nitrogen 14 cents per pound. 



Water soluble phosphoric acid 5 " " " 



Citrate soluble 5 " ** " 



Potash 6 ** '' *' 



To compute the commercial value of fertilizers ac- 

 cording to this scale, the valuation per ton of water 

 soluble and citrate soluble phosphoric acid and potash is 

 obtained by multiplying the per cent of those constitu- 

 ents by $1 00, while the value of the nitrogen per ton 

 is ascertained by multiplying the per cent, of that ele- 

 ment by $2.80. 



Take for example a fertilizer containing 



7.50 per cent, of water soluble phosphoric acid. 

 2.00 '' " " citrate soluble " 

 1.25 " " '' potash. 

 2.50 '* '' " nitrogen, 

 the commercial value per ton would be : 



For the water soluble phosphoric acid 7.50xl.00-$7.50 



" " citrate soluble '' *' 2.00x1.00 $2.00 



" " potash 2.00xl.00-$2.00 



** " nitrogen . 2.50x2.80-$7.00 



Total $17.75 



