EXPERIMENT STATION BULLETINS. 



349 



PLANTING POTATOES. 



Time of Planting 



The time of planting varies according to the variety grown, and to the 

 locality and season. Early varieties produce marketable potatoes in about 

 60 to 90 days from planting time. The late varieties require approximately 

 100 to 130 days to mature a crop. 



[ay L 



Fig. 13. Chart showing average date of last killing frosts in spring. 



Early varieties are generally planted as soon in the spring as the soil can 

 be fitted in good condition. If planted too early, the seed pieces may rot in 

 the wet, cold soil, and the tops may be injured by late frosts. The early 

 crop is often planted about two weeks before the average date of the last 

 killing frost in the spring. 



Late potatoes should be planted in time so that the crop will mature before 

 the average date of the first killing frost in autumn. Planting time usually 



