GRASS GROWING FOR PROFIT 35 
ton might be worth a great deal of money per ton — 
that is to say, if the ore were extractable with ease 
and without undue expense -— whereas another ten- 
ounce ore might contain its gold in such form as to 
be extracted only with great difficulty and at great 
Hay Pressing in Operation. 
expense. The plant food of Nitrate of Soda is all 
usable by the plant. It is already cooked. It needs no 
further preparation for the plant’s use, as do all nitro- 
gens which are raw compared to Nitrate of Soda. 
The price per ton of a fertilizer is not, by itself, 
a sufficient guide for accurately judging its value for 
crops. 
