THE ESSEX EXPERIMENTS 



35 



TABLE XV. PERCENTAGE OF GROUND SPACE OCCUPIED BY THE 

 VEGETATION ON THE PLOTS AT HORNDON 



Analysis made : August, 1919 



1 



&o 



s 







f 



-|60 



50 

 40 

 30 

 20 

 10 



12 



13 14 



I 



15 16 



FIG. 4. Percentage of Ground Space occupied by the Vegetation at Horndon, 



August, 1919. Soil London clay. 



1, Florida pebble phosphate. 5, Basic slag. 6, No manure. 8, Gafsa phosphate. 

 12, Egyptian phosphate. 13, Superphosphate heavy dressing. 14, Superphosphate 

 light dressing. 15, Superphosphate and lime. 16, No manure. 17, Basic slag. 18, Open 

 hearth fluorspar basic slag. C, Lime. 



32 



