188 EXPERIMENTS UPON GRASS LAND 



12-5- 



10 



7-5 



2-5 



Plot 3 



4-1 



17 



4-2 



II 14 



FIG. 40. Percentage of Rumex acetosa in the Herbage of the Grass Plots. 

 First Crop, Season 1903. 



Unmanured. 



Minerals only. 

 4-1. Superphosphate. 

 8. No Potash. 

 7. Complete. 



Nitrogen only. 



5. Amm.-salts. 



17. Nitrate Soda. 



Nitrogen and Minerals. 



4-2. No' Potash } . 



_ Amm.- 



9. Complete 



11. Excess N. J ' 



14. Complete ; Nit. Soda. 



