THE ROTATION OF CROPS 22O 



If this is done it may not be necessary to add any 

 nitrogen in the fertilizer, letting that supply only 

 phosphoric acid and potash. 



If commercial fertilizer is used on the cotton, it 

 would be a good plan to apply the manure from the 

 stock to the corn. 



To follow our crop on Field i through the three 

 years we will have, first, cotton drawing large 

 amounts of plant food from the soil and diminish- 

 ing the humus of the soil. 



Growing a winter crop of crimson clover, turning 

 back all the cotton refuse except the lint and oil, 

 and applying the barn manure will furnish ample 

 plant food for the corn and replenish the organic 

 matter. 



The corn is a rather stronger feeder of phos- 

 phoric acid than cotton and will be able to get suffi- 

 cient from that left by the cotton. 



The oats will be able to get a full ration after the 

 corn, and the cowpeas will readily take care of them- 

 selves on the score of plant food and will put the 

 soil in fine condition for cotton again. 



The peas may be left on the ground to turn under 

 in the spring at cotton planting time, or they may be 

 plowed under in the early fall and a crimson clover 

 or vetch cover crop planted, which will be plowed 

 under for the cotton. 



These same facts will be true of each of the three 

 fields. The humus and, therefore, texture will be 

 taken care of ; ventilation, soil temperature and plant 

 food will be controlled to advantage. 



