The rotation on the field is, Siigar-Beet, Barley, Potatoes, and Wheat. 

 The size of the plots is eacti roughly about '/i- to ' ., acre. 



One part of the plot was treated each year with Potash, 4 cwts 88 lbs and 

 9 cwts 64 lbs of Kainit, or 1 cwt 66 lbs and 3 cwts 10 lbs of 40" „ Potash Manure 

 Salts per acre, applied either in Autumn or in Spring; one portion of the plots 

 remains constantly without Potash. For each individual crop the nitrogenous and 

 phosphatic dressings remain exactly the same. 



Plot 3 on Table 1 has been without Potash since 1902, plot 2n received from 1902 

 till 1906 yearly about 4 cwts 88 lbs and since 1906 9 cwts 64 lbs. Kainit, applied 

 always in Spring. A few years after the commencement of the experiment, all plants 

 on plot 3 showed marked signs of the lack of Potash, and this became accentuated 

 each year. This lack of Potash was seen in the case of Summer Wheat, — as well as 

 on all the cereal crops — at first by a retardation in growth, accompanied by later 

 ripening. When the lack of Potash was small, this was scarcely noticeable. When the 

 plots received a complete dressing, the plants show a golden colour in the stems 

 and ears, while in the case of a deficiency of Potash, the above have a green or greyish- 

 green appearance. The fresh leaves will, beginning with the oldest, become tinged with 

 brown stripes and finally dry up, without any transitional stage in yellow, with a brown 

 tinge. The greater the lack of Potash the darker will be the colour. The ears ripen 

 darker than in the case of the completely manured. Furthermore the plant is much 

 more liable to lodge when Potash is lacking. This is very clearly shown in Table 1. 



- 8 



