14 



CKOPPING SYSTEMS FOR THE BLACK LANDS OF TEXAS. 



Where root-rot is exceptionally destructive, leguminous catch 

 crops such as cowpeas and soy beans should be left out of the rotation 

 until the disease is checked, but where it appears only on a plant here 



lif W. 



^^-"//f. 



TV VR, 



FIRST PERIOD 



' FUBLIC eons' 



SECOND PERIOD 



-pmic ma 



KA' 



8''^ YR. 



FOU/^TH PERIOD 



roBiic no ftp 



ISA. 



PERMAHEMT 

 PASTURE 



PDBDi fdiff 



lOA, 



"AHmTEflO 



ALFALFA 



OATS 



ISA. 



PERMAMEMT 

 PASTURE 



COTTOn oe 

 WHEAT 



CORn 



jvrR. 



Pi/But mb 



6'^ YR. 



9iy- YR. 



PuhUC PoAD' 



ISA 



PERMAMEMT 



PASTURE 



OA 



OATS 



co/?n 



ISA. 



PERHAnEMT 



PASTURE 



ALFALFA 



COTTOn oe 



WHEAT 



Tonirn IIWYil IZ'^ YR. 



Fig. 7.— Appearance each year for 12 years of a 160-acre farm, 120 acres of which are devoted to four crops of 

 30 acres each, in rotation, viz, alfalfa, cotton or wheat, oats, and corn. 



and there its effects will be more than compensated for b}^ the benefits 

 derived from these crops. 



ICir. S41 



