72 DEPARTMENT OF AGRICULTURE GEORGIA. [358] 



plants would not get the first year. The plot without ma- 

 nure yielded thirty-five bushels, and the manured plot 

 yielded sixty-four and four-tenths bushels, or four and 

 four-tenths bushels more than were required. He sent, 

 the same year, the same quantity of fertilizer to Mr. Kurd, 

 at Hadley, in the same State, stating that It would give an 

 increase of twenty-five bushels over the production of the 

 unaided soil, which was very poor. The unmanured plot 

 produced eighteen bushels, the manured plot forty eight 

 five more than was predicted. Concluding, therefore, that 

 the surplus application was not necessary, he applied the 

 next year just the quantity thought necessary to give fifty 

 bushels more than the production ot the soil without ma- 

 nure. The result was that the unmanured plot produced 

 thirty-four bushels to the acre, while the manured plot gave 

 83.28 bushels to the acre. 



Similar experiments were conducted with potatoes, oats, 

 hay and beans, with correspondingly satisfactory results. 

 Not only so ; but the same plots planted the second year, 

 gave a large increase over the unmanured plots ; showing 

 that the effects of the manure continued through the sec- 

 ond year. These experiments have not been conducted 

 sufficiently long to establish the principle, but the results 

 thus far justify further experiment on the same line. 



While plant fertilization alone generally gives satisi'acto- 

 ry results, its effects are much more satisfactory when used 

 in connection with soil fertilization, especially when green 

 manuring is resorted to as a means of soil improvement. 



I 



CHAPTER V. 



SOIL FERTILIZATION. 



This, though embracing plant fertilization, and having 

 for its ultimate object the supply of food for plants, differs 

 from it in several material respects. 



