EXPERIMENT STATION BULLETINS. 



527 



and disc thoroughly before the manure has time to dry out. Well rotted 

 manure is not as apt to cause potato scab as is fresh manure. 



TIME OF PLANTING. 



The time of planting has a distinct influence on the crop to be pro- 

 duced in this section, where it is necessary to have the entire growing 

 season properly to develop and mature the crop. 



TABLE 23 



DATA SHOWING THE EFFECT OF DATE OF PLANTING ON THE YIELDS 

 OF THE LATE VARIETIES^ GREEN MOUNTAINS AND RURALS, 



The percentage of No. 2 potatoes increased very much after June 16th 

 planting so that June 30th gave only about 50 per cent No. I's. 



On account of the fact that the late spring frosts and early fall 

 frosts are only 85 to 100 days apart, it is essential to plan the planting 

 so as to have the potatoes coming up a few days after the danger of the 

 last killing frost in the spring, if we are to get maximum yields of ma- 

 tured potatoes. 



RATE OF PLANTING. 



TABLE 2-i THE AMOUNT OF SEED NECESSARY TO PLANT AN ACRE OF POTATOES 



WITH VARIOUS SIZES OF SEED PIECES SPACED AT VARYING DISTANCES. 



