of manuring, pursued for d period covering many years, and further, that such 

 statistics and such illustrations can properly be understood and fully appreciated, 

 only where previous cropping is taken into consideration. 



As is to be expected, where one-sided manuring has been practised, the soil of 

 the E-field shows signs of marked impoverishment of the plant foods withheld, 

 cf. following analytical figures: 



Percentdge 



in Soil 

 1901 



N . . 

 K.O 

 P.O, 

 CaO 



K 



0,111 

 0,553 



0,368 

 3,570 



N 



0,118 

 0,445 



0,379 

 3,580 



Plot 

 4 5 



NP 



0,110 



0,472 

 0,362 



3,774 



The effect of manuring in increasing or diminishing the potash supply of the soil 

 can readily be seen by an examination of the potash contents as tabulated above. 

 The same applies to phosphoric acid, with the exception of plot 8, and this 

 exception, 1 am inclined to attribute to a mistake in the taking of the soil sample. 

 As regards the nitrogen content, not much variation is to be observed. In explanation 

 of the somewhat small amount of lime contained in plots 1 - 3, I would mention. 



41 - 



