the present conducted without farmyard manure. This experiment has been in 

 operation since 1910 so that the plots here given, have carried beet twice. 

 The individual plots shew in general, as also here, the following differences: 



Table 15. 

 (Plot 1.) 

 The manure quantities supplied would have been just sufficient to cover the plant 

 requirements when no Nematodes would be present. 



According to the statements made in connection with the pot experiments, a small 

 deficiency in plant food is bound to set in, whit+i, however, as it mainly falls on 

 the nitrogen, only exhibits itself by means of a smaller vegetation and a some- 

 what earlier ripening. 



Indications of plant food deficiencies manifest themselves with the given amount 

 of manure only in a small way, so that it is often difficult to distinguish definitely. 

 The leaves wither a brown colour after previously turning yellow. The beets 

 are sound and the sugar content normal. 



Table 16. 

 (Plot 2.) 



The small application of nitrogen induces about the end of June, quite a marked 



retardation of growth, and the leaves assume at the same time a light green 



colour. In the course of the next few months the beets are increasingly more 



retarded, the leaves becoming light coloured simultaneously. During September and 



21 — 



