AGRICULTURAL EXPERIMENT STATION*. 



97 



been subjected to continuous cropping. At the time it was 

 plowed up it was cutting only half a ton of hay per acre. The 

 experiment was conducted on one -tenth acre plots, and the 

 amounts of phosphates applied were such that the plots receiving 

 crude phosphates obtained four times as much insoluble phos- 

 phoric acid as was received of soluble phosphoric acid by the plots 

 to which the acid phosphate was applied. 



Mr. Leland writes that the bad weather seriously interfered with 

 the experiment for this year. 



The results are valuable, however, as showing the relative effect 

 of the phosphoric acid from the various sources. 



In 1889 the average increase of the plots receiving phosphoric 

 acid with sulphate of ammonia and muriate of potash over the 

 plots receiving only sulphate of ammonia and muriate of potash 

 was for 



Acid South Carolina Rock, 194 per cent., 

 Fine Ground South Carolina Rock, 113 per cent., 

 Fine Ground Caribbean Sea Guano, 62 per cent. 

 In 1890 the gains were for 

 Acid South Carolina Rock, 124 per cent., 

 Fine Ground South Carolina Rock, 65 per cent., 

 Fine Ground Caribbean Sea Guano, 42 per cent. 

 The following tables show the results obtained bv Mr. Leland 

 for the years 1889 and 1890. 



EXPERIMENT OF H. L. LELAND FOR 1889. 

 Crop Potatoes. 



l. 



2. 

 3. 



3a. 



4a, 

 5a . 



"Name of fertilizer. 



Acid S. C. Rock 



Sulphate of ammonia. . . . 



Muriate of potash 



Pine ground S. C. Rock. 

 Sulphate of ammonia . . . 



Muriate of potash 



Caribbean Sea Guano . . . 

 Sulphate of ammonia ... 



Muriate Of potash 



Sulphate of ammonia... 



M uriate of potash 



No fertilizer 



AcidS. C. Rack ••• 



Sulphate of ammonia . . . 



Muriate of potash 



Fine ground S. C. Rock. 

 Sulphate of ammonia ... 



Muriate of potash 



Caribbean Sea Guano 



Sulphate of ammonia 



Muriate of potash 



Sulphate of ammonia... 



Muriate of potash 



No fertilizer 



Amount 

 per 

 acre. 



500 

 150 

 100 

 1000 

 150 

 100 

 725 

 150 

 100 

 150 

 100 



500 



150 ; 



100 

 1000 

 150] 

 100 

 725 ; 

 150 

 100 ' 

 150 i 

 100' 



lbs, 



Yield* 

 per acre 



of 

 potatoes. 



68J bush. 

 50 



40 



22 



30 



65 



48J " 

 33i " 





*Rust killed potato vines about August 15th, or the yield would probably have been 

 greater. 



3E. 



