86 



MAINi: AGRICUI^TURAL EXPERIMENT STATION. I909. 



Home mixed formulas used for one acre in ipo6. 



Ingredients. 



Number of Formula. 



'Nitrate of soda . . . 

 Screened tankage. 



Dried blood 



Acid phospate . . . . 

 Sulphate of potash 



Pounds. 

 100 

 200 

 160 

 600 

 160 



Pounds. 

 175 

 400 



600 

 160 



Pounds. 

 100 



300 

 600 

 160 



Pounds. 

 100 

 200 

 160 

 600 

 320 



Plant food per acre furnished by fertilizer 



used in 



IQO6. 





Nitrogen. 



Phosphoric Acid. 







Available. 



Total. 



Potash. 





Pounds. 



48 

 48 

 48 

 48 

 48 



Pounds. 



98 

 112 



84 



98 

 108 



Pounds. 

 122 

 154 

 90 

 122 

 150 



Pounds. 

 80 



Formula No. 2 



SO 





80 





160 





76 







The field was planted A^Tay 19-26 to Green Mountain potatoes 

 and about two-thirds of the fertilizer used, 1000 lbs. of the 

 Watson and 800 lbs. of the home mixed to an acre, was applied 

 at this time. On June 11 to 14 when the potatoes were just 

 breaking the ground the remainder of the fertilizer was put on, 

 making up the plant food equivalent to 1500 lbs. of Watson's 

 fertilizer or in round numbers about 45 pounds of nitrogen, 90 

 pounds available phosphoric acid and 80 pounds of potash 

 except on plot 14, where the potash was doubled making 160 

 pounds to the acre. The second application was made with the 

 potato planter, the plow being removed. During the growing 

 season the field was thoroughly tilled and sprayed but suffered 

 considerably from the hot dry weather in August and early 

 September, which stunted the growth of the tubers. On Sep- 



