Food for The main point, however, is to determine whether it 



Plants is a paying proposition, and the following tables show 



98 the yield and value of crops, as well as the profits 



derived when mineral fertilizers only are used, and also 



when Nitrate of Soda is used in addition. 



Yield of Crops in 1905. 



Upland. Lowland. 



Without With 200 lbs. Without With 200 lbs. 

 Nitrate. Nitrate Nitrate. Nitrate 



per acre. per acre. 



Yield per acre.. 3,180 lbs. 8,340 lbs. 6,985 lbs. 8,712 lbs. 

 Increase from Ni- 

 trate 5,160 lbs. 162% 1,727 lbs. 24.7% 



Crop of Grass Grown by Nitrate Top-Dressing. 1906. 



These results are strikingly significant, showing in 

 the first place the difference in adaptability of the two 

 soils for hay growing. The upland was deficient in 

 humus, and being dry and gravelly, was unable to pro- 

 vide Nitrogen in any quantity although an abundance 

 of minerals was present. The lowland, on the other 

 hand, containing a large proportion, was capable of fur- 



