LEGUMES AND GRASSES 



41 



6 9 12 15 18 21 24 27 30 

 TONS OF MANURE APPLIED 

 PER ACRE EVERY 3 YEARS 



Figure 4. — Effects of manure (applied every 3 years) on nitrogen and carbon losses 

 in a fallow, wheat, kafir rotation at Hays, Kans., 1916-46. Data from Hobbs and 

 Brown (85). 



