EXPERIMENT STATION BULLETINS. 



367 



which one-half were hilled up July 13 and the others received one more 

 level cultivation July 15. The small difference in favor of level cultiva- 

 tion is no doubt due to late blight, which probably affects potatoes 

 which are close to the surface quicker than those which are protected 

 by a greater depth of, soil. While former experiments here as well as 

 elsewhere have shown level cultivation to be more profitable than hill- 

 up, ''ridging" or partial hilling up at the last cultivation is sug- 



ing 



gested as still more profitable during wet seasons when late blight is 

 prevalent. 



Further observations of the effects of Paris green upon potato beetles 

 showed that for 100 gallons of water 'IV^ pounds of Paris green are 

 safer than 2 pounds,, at least until a law may be enacted which will 

 require the inspection and branding of Paris green. The fall planting 

 was done November 5, 7 and 9, and in order to find out whether extra 

 early planting would cause the spring planted potatoes to come up as 

 early as the fall planted, the spring planting was done May 18 and 20 

 when the ground was still too cold and investigations had shown that 

 the fall planted potatoes were still in a dormant condition. The earlier 

 ])lanting left the spring planted potatoes as much behind as during 

 former seasons, although different results had been anticipated. 



The time of sprouting and blossoming is shown in the following table, 

 the date of sprouting being the time when the rows could be clearly 

 distinguished. 



The yield of the varieties is shown in the following table. 



TABLE OF FALL PLANTED POTATOES. 



