61 



Increase of seed cotton per acre when kainit was added: 



To unfertilized plot 184 Itte. 



To cottonseed meal plot 144 '" 



To acid phosphate plot 120 " 



To cottonseed meal and acid phos. plot. ... 24 " 



Arerage increase with kaiuit 108 " 



Acid phosphate was most effective. Both cotto-nseed 

 meal and kainit, although not equalling acid phosphate, 

 were beneficial. The benefit from kainit in 1897 is not nec- 

 essarily an indication that this soil is deficient in potash, 

 since at least a large part of this benefit seems due to the 

 rust-restraining tendency of this fertilizer. 



