118 The Sweet Potato 



Second Tear. Sweet potatoes followed by a winter 



cover-crop of rye or oats and vetch. 

 Third Year. Oats, followed by peanuts or cowpeas.- 

 2. First Year. Sweet potatoes followed by a winter crop 

 of rye or oats and vetch. 



Second Year. Cotton, with rye sown between the rows 



for winter pasture or to turn under. 

 Third Year. Corn with cowpeas or velvet beans planted 

 as a soil-improving crop. 

 AA. Four-year rotation for the southern sweet-potato 

 section : 



First Year. Sweet potatoes. 



Second Year. Winter oats, followed by peanuts or 



cowpeas. 

 Third Year. Cotton, with bur clover between the rows. 

 Fourth Year. Corn, with cowpeas or velvet beans be- 

 tween the rows. 

 AAA. Three-year rotation for the eastern shore of Vir- 

 ginia and Maryland: 



First Year. Sweet potatoes, followed by crimson clover 



or rye as a winter cover-crop. 

 Second Year. Early Irish potatoes. In many farms 

 corn is planted between the rows of potatoes at the 

 last cultivation; on other farms the potatoes are fol- 

 lowed by fall vegetables. 

 Third Year. Winter oats, followed by cowpeas for hay. 



These rotations are merely suggestive and will neces- 

 sarily be changed according to the existing influences 

 governing any case. Miller concludes, " In planning a 

 sweet potato rotation, the importance of plowing under a 

 soil-improving crop once every two or three years should 

 be borne in mind. The crops to include in this rotation 

 will vary according to local conditions. Wherever 

 practicable a leguminous crop, such as cowpeas, soy- 

 beans, velvet beans, or crimson clover should be used in 

 order to supply nitrogen as well as humus." 



