ALFALFA - 19 59 

 50 



CONTROL 500 1100 1500 



CONTROL G50 1250 1800 



DRAWBAR PULL IN POUNDS 

 Figure 3. Effect of increasing drawbar pull with siniooth tires and 

 new tires on yields of alfalfa (1959). 



RED CLOVER-1959 

 50 



45 



40 



35 - 



30 



25 



20 



15 



10 



I 





i 



I 



NEW TIRES 



I 



I 





I 



I 



I 



I 





CONTROL 500 1100 1500 CONTROL 650 1250 1800 



DRAWBAR PULL IN POUNDS 

 Figure 4. Effect of increasing drawbar pull with smooth tires and 

 new tires on yields of red clover (1959). 



