THE ESSEX EXPERIMENTS 



27 



It is obvious from the results presented in Table XI that some other 

 factor than phosphoric acid is limiting the production of hay on this 

 soil. Only in the dry year of 1919 was the response to the various 

 types of phosphate in any way marked. Under such conditions no 

 useful purpose can be served by discussing the effect of the various 

 phosphates. Any differences that may exist must be meaningless 

 in view of the smallness of the response and the obvious variations 

 in the soil. The soil on Plots 15, 16 and 17, for example, is considerably 

 richer in phosphoric acid than the soil on Plots 1, 2 and 3. 



TABLE XI. WEIGHT OF HAY AT HASSOBTJBY 

 Manures sown: January, 1917 



* Plot 9 raked and half cocked. Plots 1-8 lying in the swathe. Hay-making 

 interrupted by two days' rain, plots not being weighed till four days later, 

 f Plots 10-^18 inclusive raked and cocked before the rain. 



Farnham Hall. The manures at this centre were not applied until 

 the end of February, 1917. The results for 1917, 1918, 1919 and 1920 

 are given in Table XII. 



