4o. 



Increase of seed cotton per acre wli-en kainit was added: 



To unfertilized plot G7 lbs. 



To cotton seed meal plot GG lbs. 



To acid phosphate plot 131 lbs. 



To cotton seed meal and acid phosphate plot . . — 78 lbs. 



Average increase with kainit 46 lbs. 



Experiment Made by J. I). Billingsley, Five: Miles West- 

 OF Tallassee_, in Elmore County^ in 1903. 



Black sandy upland; light colored subsoil. 



The original growth of longieaf pin^ and oak had been- 

 removed about thirty years before. There was no rust and" 

 very little shedding. All plots were thinned to the same- 

 number of plants, namely, 5,760 per acre. 

 . The rainfall was favorable. For yields see page 47. 



The largest yield was obtained from the complete fertil- 

 izer which afforded an increase of 552 pounds of seed cotton 

 per acre, or a net profit on plot 6df |8.97, and on plot 10 of" 

 $9.67. The principal need was for potash and nitrogen, this- 

 being one of the few soils Avhere, in the absence of rust, 

 kainit was more important than acid phosphate. 



Increase of seed cotton per acre when cotton seed meal was added • 



To unfertilized plot .' 136 lbs. 



To acid phosphate plot 204 lbs. 



To kainit plot 470 lbs. 



To acid phosphate and kainit plot 225 lbs. 



Average increase with cotton seed meal 258 lbs. 



Increase of seed cotton per acre when acid phosphate was added.: 



To unfertilized plot ' 40 lbs. 



To cotton seed meal plot 108 lbs. 



To kainit plot 301 lbs. 



To cotton seed meal and kainit plot 5G lbs. 



Average increase with acid, phosphate T26 Ibsi, 



