20 



"The soil was: 



1. A loamy soil of 0.23 per cent, potash (kali), which gives 

 for the larger vessels 35 gr. potash (kali) for the smaller 

 1 1 ^2 gr. potash (kali). 



2. A light sandy soil of 0.036 per cent, potash (kali), which 

 makes 7^ gr. potash (kali) for the larger, 2^3 gr. potash 

 (kali) for the smaller vessels. 



"As potash (kali) fertilization the smaller vessels received ^ 

 gr. potash (kali), the larger ones 2 gr. potash (kali). In all 

 cases enough nitrogen and phosphoric acid was supplied for 

 the production of a maximum crop. 



" The results, as far as I can briefly give them in this publi- 

 cation (a more extensive publication is under way) are the 

 following: 



'i. Potash (kali) fertilization has in all cases shown decided 

 effects, except with potatoes (more about these potatoes- 

 later on). 



2. On the sandy soil, poorer in potash (kali), the effect is 

 much more pronounced than on richer soil. 



3. The potash (kali) requirement of the various plants varies - 

 very much. It appears most pronounced in the case of 

 cereals. 



"These experiments confirm therefore Schultz-Lupitz's 

 assertion of the great importance of potash (kali) fertilization 

 for cereals." 



PROF. WAGNER'S CONCLUSIONS. 



On the strength of these experiments and the lesson they 

 teach, Professor Wagner proceeds to lay down in the following: 

 paragraphs what he feels justified in saying about potash (kali) 

 fertilization. 



i . A high rate of advantage from potash (kali) fertilization ap- 

 pears most probable on light sandy soils and on peat soils. 

 These soils are as a rule so poor in potash (kali) that they 

 require a large supply of potash (kali) salts in order to pro- 

 duce satisfactory crops. The potash (kali) salts best adapted 

 for these soils are kainit and carnallite. Richer soils should 



