137 



TABLE II. 



Potato Scab (Oospora Scabies) in Silica Sand Pot Cultdkes. 



Treatment of Soil 



Per Cent, 

 of Scab. 



NPKsSOi 



NPKCl 



NPK2SO4 + NazSO,, 



NPK2SO1 + NaCl 



NPK2SO4 + sulfur 



NPKC1 + sulfur 



N P KsSO. + NajSOi + sulfur. 

 N P KoSOi + NaCl + sulfur. . . 



N = 7 gr. dried blood plus 6.7 gr. nitrate soda per pot. 



P = 5.1 gr. di-calcic phosphate per pot. 



KjSOi = 3.6 gr. sulfate of potash per pot. 



KCl = 3.6 gr. chloride of potash per pot. 



NajSOi = 3.4 gr. sulfate of soda per pot. 



NaCl = 2.8 gr. chloride of soda per pot. 



Sulfur = 8 gr. per pot or approximately 360 lbs. per acre. 



All pots had a treatment of 100 gr. calcium carbonate per pot. 



Early Ohio potatoes treated with formalin were planted. 



