490 INVESTIGATION BY CULTURE EXPERIMENTS 



" there are no fertilizers that will give better results on cotton 

 than well-preserved and thoroughly rotted farmyard manures, 

 applied very early in the season of preparation; but it will add very 

 much to the effectiveness of such manures to mix with them a lib- 

 eral dose of acid phosphate, say 100 to 200 pounds to each ton." 



It should be kept in mind that the upland soils of Georgia are as 

 a rule much worn and extremely deficient in active organic matter. 

 Thus, the average yield of corn on the 4^ million acres annually 

 produced is n bushels per acre, for the 10 years, 1899 to 1908. 



The following statements regarding distances for planting corn 

 occur on page 126 of Georgia Bulletin 72: 



"On soils of still less capacity, say from 10 to 15 bushels per acre, the dis- 

 tance should be still greater, say 18 to 24 square feet to the stalk, or 2420 to 1815 

 hills to the acre. Eighteen square feet to the stalk would be secured by spacing 

 6 feet by 36 inches, or 5 feet by 43 inches; or 4 feet 3 inches by 4 feet 3 inches. 

 A soil that would produce less than 10 bushels, with good seasons and very light 

 manuring, is not fit to plant in corn." 



Many of the Georgia experiments relate to a study of the effect 

 of varying the proportions of the different fertilizers, as illustrated 

 in Table 100 (Georgia Bulletin 62, page 93, year 1903): 



TABLE 100. GEORGIA FERTILIZER EXPERIMENTS WITH CORN 



"The plan of the experiment was to make up five different formulas and apply 

 the same cost value of each different formula to corresponding successive plots." 



The same section of land (Div. B, Sect, i East) was used for 

 corn in 1900, and the report for that year states that " no plots 

 were left unfertilized." The fertilizer (including 53 pounds 



