'74 



Food for W eather and cultivation, agree exactly with those conducted 

 Pl>nts at the Experiment Station. Under the conditions of practical 

 farming, therefore, 100 pounds of Nitrate of Soda have pro- 

 duced an average increase of yield of 400 pounds of grain, 

 with the corresponding straw. This even is not sufficient; 

 we must know the net profit. What net profit has been ob- 

 tained in the experiments carried out in the various districts ? 

 In the production of crops both phosphoric acid and potash 

 are necessary, in addition to nitrogen, but nitrogen we must 



Lime Distributor and Fertilizer Drill. 



have; if the land is very poor in this substance, the heavier 

 the fertilizing with phosphoric acid and potash, the greater 

 will be the reduction in the amount of net profit. This net 

 profit has been calculated for the ten groups of experiments, 

 of which gross profit has been shown. To obtain these results, 

 the market value of the additional fertilizers has been deduc- 

 ted and the remainder called net profit. The market value of 

 the products, however, has been set relatively low. 



