38 



THE ESSEX EXPERIMENTS 



TABLE XVI. WEIGHT OF HAY AT BTTTTERFIELDS, LATCHINGDON 

 Manures sown: December, 1915 



* During the late winter and early spring of 1919-20 cattle were driven without 

 the knowledge of the farmer across a portion of this meadow on their way to a more 

 distant pasture. Their track lay right along the length of Plot 2, which they poached 

 badly. As a result, although this plot had the best bottom, there was not such a 

 vigorous growth as on the other treated plots. 



FIG. 5. Yield of Hay (average of 5 years) for the various Phosphate 



Plots at Butterfields, Latchingdon. Soil London clay. 



3, Untreated. 2, Gafsa rock phosphate. 4, Open hearth (fluorspar) basic slag. 

 5, Open hearth (high soluble) basic slag 1. 1, Basic Bessemer slag. 6, Open hearth 

 (high soluble) basic slag 2. 



