30 HATCH EXPERIMENT STATION. [Jan. 



Plot 1 . No potash. Pounds. 



Plot 2. Kainite, 27.75 



Plot 3. High-grade sulfate of potash, 



Plot 4. Low-grade sulfate of potash, 



Plot 5. Muriate of potash, 



Plot 6. Nitrate of potash. 



Plot 7. Carbonate of potash-magnesia, 



Plot 8. Silicate of potash, 



7.50 



15.00 



7.50 



8.25 



20.00 



17.00 



Plots 9-16, 17-24, 25-32 and 33-40 are duplicates re- 

 spectively of plots 1-8. 



The crop this year (the second of the experiment) was 

 potatoes, Beauty of Hebron, seed from Maine. It was 

 planted in drills, one set (2-3 eyes) in 14 inches. The 

 tubers were subjected to the formalin treatment, to prevent 

 scab, being soaked two hours in a solution of eight ounces 

 to 15 gallons of water. They were budded in a light room 

 after treatment, before being planted on May 8-9. The 

 crop was well cared for, and sprayed repeatedly with Bor- 

 deaux mixture, to prevent blight, of which there was little. 

 The yield was heavy, varying from 297 to 380 bushels of 

 merchantable potatoes per acre on the different potash salts. 

 The results are not entirely conclusive, for the reason that 

 in duplicate plots the yields of the different salts do not 

 occupy the same relative rank. Thus, for example, the 

 various salts made the following relative yields in merchant- 

 able tubers : — 



Kainite stands : — 



1st, ouce ; 3d, once ; 6th, twice ; and 7th, once. 

 High-grade sulfate of potash stands : — 



1st, twice ; 2d, twice ; and 3d, once. 

 Low-grade sulfate of potash stands : — 



2d, twice ; 3d, once ; 6th, once ; and 7th, once. 

 Muriate of potash stands : — 



1st, once ; 4th, twice ; 5th, once ; and 6th, once. 

 Nitrate of potash stands : — 



Once each : 3d, 4th, 5th, 6th and 7th. 

 Carbonate of potash-magnesia stands : — 



1st, twice ; 3d, twice ; and 5th, once. 

 Silicate of potash stands : — 

 4th, twice ; 6th, twice ; and 7th, once. 



