AVERAGE CROPS. 99 



Carolina, which shows the lowest average pro- 

 duction, as follows : 



Wheat 5-6 bushels. 



Eye 5-0 



Barley 9'0 " 



Corn 10-2 bushels. 



Oats 9-7 



Potatoes... 101-0 



The crop of potatoes exceeds the general aver- 

 age, but the amount of the other crops raised 

 must afford a very inadequate remuneration to 

 the farmer, barely exceeding the cost of seed, 

 cultivation, and preparation for market. The 

 principal cause of this state of things is the ig- 

 norance of the farmer of what substances he 

 needs, in kind and quantity to produce the in- 

 tended crop. A full knowledge of what and 

 how much plants need to insure their healthy 

 growth, will induce the farmer to use all care 

 and economy in saving, preparing, and applying 

 these substances. The Tables already given are 

 invaluable in giving this information. But there 

 are necessary conditions that must be complied 

 w r ith. A plant contains various substances, and 

 every one of these must be present to enable it 

 to come to maturity. Besides, these substances 

 must be in a condition to become soluble in wa- 

 ter, either alone or in combination with other 

 substances with which they are brought in contact 

 in the soil, during the time that intervenes be- 

 tween the planting and the gathering of the 

 crop. This is a very intricate subject, and 



