FERTILIZERS. 625 



In 1889, 1890, and 1891, g3TSum 370 lbs. per acre, quicklime 2,000 

 lbs. per acre, and shell marl 8,000 lbs. per acre, were compared on 

 corn and wheat on a well-drained sandy loam soil, "The results show 

 that the sulphate of lime and the quicklime produced marked effects 

 the first 3'ear of application, but that the carbonate showed no effect 

 until the second year. In the sum total of the 3 years' crops all of the 

 applications proved to be quite beneficial, and the quicklime produced 

 the greatest increase in yields." 



In another series of experiments with corn and wheat carried out 

 during 1890 and 1891, stone lime 2,000 lbs. per acre, oyster-shell lime 

 2,000 lbs. per acre, ground oyster shells 2,000 lbs. per acre, marl 4,000 

 lbs. per acre, and gypsum 233 lbs. per acre, were compared on stiff cla}' 

 naturally inclined to be wet. In all cases the yields were increased by 

 the application, the ground oyster shells being especially effective, and 

 much more so than the marl. 



An account is given of a series of experiments begun in 1893 and 

 partly reported in a previous bulletin (E. S. R., 10, p. 633), to test the 

 effect of lime (20 bu. per acre) on a rotation of corn, wheat, and hay. 

 The results up to the close of 1899 are reported. The figures show 

 "that the application of lime to this land was a beneficial and profitable 

 procedure." In a series of experiments begun in 1896 on stiff clay 

 land, inclined to be a little wet, varying amounts of lime (10 to 60 bu. 

 per acre) were compared on the above rotation. The experiments 

 have been partly reported (E. S. R., 10, p. 633). The results for 4 

 3"ears (1896-1899), show "that small applications of lime have proven 

 to be as efficient at the end of 4 years as the larger applications, and 

 that the relative profits, up to date, are in favor of appljnng 20 bu. 

 per acre. It is of interest to note that in the hay crop the 10 bu. of 

 lime gave the largest net return." 



Since 1896 experiments have been in progress to test the effect of 

 lime in connection with green manure. Stone lime was applied at the 

 rate of 10 bu. per acre, cowpeas were sown, which were turned under 

 for wheat, the wheat was followed by clover, which was cut for hay, 

 and the land planted to corn. The net gain from the wheat, hay, and 

 corn was ^•4.97 in case of cowpeas alone and $5.03 in case of cowpeas 

 and lime. The combination of cowpeas and lime seemed to have a 

 more lasting effect than cowpeas alone. 



During 5 years (1895-1899) experiments have been made to test stone 

 lime at the rate of 1,400 lbs. per acre, oyster-shell lime 1,400 lbs., 

 magnesium oxid 1,400 lbs., barium oxid 1,400 lbs., shell marl 13,000 

 lbs., finel}' ground oyster shells 2,600 lbs., gj^psum 4,125 lbs., gas lime 

 2,925 lbs., finel}^ ground South Carolina rock 2,925 lbs., and soft-coal 

 ashes 13,000 lbs. per acre. Corn was grown during 4 years, wheat 

 one (1897). 



