No. 4.] MANURIAL PROBLEMS. 151) 



manured in 1893 with 120 pounds of nitrate of soda, 480 

 pounds of acid phosphate and 120 pounds of muriate of 

 potash per acre, and was devoted to cow peas. The same 

 autumn the cow peas were plowed under, in preparation for 

 the succeeding- potato crop. 



Plot 13, as has been stated, did not enter the rotation with 

 a potato crop until 1895. The treatment of the land in the 

 interim was as follows : — 



Manures apiilied per Acre in 1893 (Pounds). 



Nitrate of soda, ....... 300 



Acid phosphate, ....... 240 



Fine-ground bone, ...... 180 



Muriate of potash, . . . . . .120 



Spring rye and common red clover seed were sown, but 

 the rye seed was poor and did not germinate, and the clover 

 plants which germinated were' dead by 1894, so that no 

 clover crop was secured in that year. The cause for the 

 failure of the clover has since been found to have been the 

 acidity of the soil. No manures were used in 1894. 



The potato tubers were cut, in the first four years of the 

 expermient, into one-ounce pieces ; but later, based upon 

 the results of experiments by Arthur (Bulletin No. 42, 

 Indiana Agricultural Plxperiment Station, Lafayette, Ind., 

 November, 1892), they were cut into approximately two- 

 ounce pieces. 



In order to avoid potato scab in so far as possible, and 

 still enjoy the advantage from liming, particularly in the 

 line of securing relatively more large potato tubers and in 

 correcting the soil acidity in order that clover might be 

 grown ; the lime is applied after the removal of the potato 

 crop, and the seed tubers are treated with corrosive sub- 

 limate solution or formalin, to destroy as many as possible 

 of the germs of the potato scab fungus which may be upon 

 them. It is gratifying to be able to state that by this pro- 

 cediu*e all of the advantages of liming have thus far been 

 derived, without unfiivorable results in other respects. 



Below are given the fields of potato tubers in each course 

 of the rotation, in bushels per acre : — 



