148 



LESSONS IN AGRICULTURE 



To demonstrate the effect of plant foods as prepared 

 in these tablets, fill two cans or flower pots with per-, 

 fectly clean sand which has been heated to the boiling 

 point of water. Plant six grains of wheat and three 

 grains of corn in each pot. Keep one pot of sand moist 

 with rain water. Keep the other in the same condition 

 as to moisture, to which has been added plant food to 

 the proportion of two tablets to each pint of water. 



At first there will be no difference perhaps in the 

 growth of the plants, but in two or three weeks, when 

 the food stored up in the grain is exhausted, the dif- 

 ference in vigor and growth is clearly evident. Such 

 substances as those contained in these tablets, when ap- 

 plied to the soil, are known as fertilizers. 



Table showing proportions of fertilizing substances in farm 

 crops: 



Ounces per Bushel. 



Cotton seed 13.8 oz. 



5.8 oz. 



5.4 oz. 



Ounces per 100 Ibs. 



