125 



100 



80 



-60 



~u 



a; 

 "> 



£40 



en 



20- 



o o 



Yield = 140 - 3.36(Ratio) + 0.02(Ratio)' 



-o- 



10 



20 



30 40 



N' c Titio 



50 



60 



Fig. 12. The effect of herbage N:S ratio on relative yield of 4-week 

 old sorghum-sudangrass tops. 



