FORAGE PRODUCTION IN EARLY SPRING 



6S 



hu-iUnn of the Author. ) 

 liN A SEASON, 

 for two years in succes- 



{Forest Service, uiu 



Fig. i8. — effect ON VEGETATION OF CROPPING TWI 



Plot of violet wheatgrass {Agropyron violaceum) harvested twice each sej 



sion, the first cutting being made at the time of seed maturity and the second near the end of 

 the growing season. All the plants were vigorous and healthy; they produced a large yield and 

 an abundance of seed of good germination strength. (Photographed in the spring of the third 

 season of the test, prior to harvesting.) 



{Forest Service, under direction of the Author.) 

 Fig. 19. — EFFECT ON VEGETATION OF CROPPING SE\TRAL TIMES IN A SEASON. 

 Plot of violet wheatgrass located adjacent to that shown in Figure 18. The plot was harvested four 

 times each season at monthly intervals for two years in succession, the first cutting being made 

 two weeks after growth had begun. The yield was approximately five times less than that from 

 the plot shown in Figure 18. At the end of the third year 85 per cent of the plants had died. 

 (Photographed in the spring of the third season of the test, prior to harvesting.) 



