October, only the youngest leaves are bright green, while the older are yellow 

 green, and all wither up a very light yellowish brown with an intermediate dull 

 yellow colour. The beets are sound and the sugar content is normal. 



Table 17. 



(Plot 3.) 



In sharp contrast to the plants depicted on Table 16, the beets in this case of 



Potash Starvation do not differ essentially from those on Table 15 during the 



earlier period of growth. 



In luly, however, a markedly undulating appearance is noticed on the leaves, the 

 foliage becomes dark green, and in the following months the leaves exhibit sooner 

 or later, according to the weather, the characteristic indications of Potash starvation, 

 as depicted in the pot experiments. The sunshine causes beet, infested with 

 Nematodes to wither easily and this is specially marked where Potash is deficient. 



In the field, of course, the individual plants do not resemble one another so closely 

 as in pot experiments: beets with the acutest Potash deficiency are intermingled 

 with some whic+i are only exhibiting the first signs of the want. Here can be 

 seen a beet with only a few quite small leaves, almost dead; there, another with 

 long pointed leaves standing higher, and next it perhaps also one whose leaves 

 can scarcely be distinguished from those of a normal plant. All sorts of inter- 

 mediate stages are present, so that a field which has a greater deficiency of Potash 



22 — 



