51 



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



To unfertilized plot — 91 80 



To cotton seed meal plot 33 160 



To kainit plot — 93 90 



To cotton seed meal and kainit plot 250 160 



Average increase with acid phosphate 25 123 



Increase of seed cotton per acre when kainit was added: 



To unfertilized plot 196 40 



To cotton seed meal plot 70 10 



To acid phosphate plot 194 50 



To cotton seed meal and acid phosphate plot 287 10 



Average increase tvith kainit 187 28 



Autauga County^ 2 Miles East of Prattville. 

 J. W. YouxG. 1005-6-7. (See Table, p. 52.) 



Reddish sandy soil tvith a red clay subsoil. 



The stand eacli year was jjood and uniform. Results were 

 somewhat obscured by unfavorable weather conditi-Jns in 

 1905 and by the September storm and the occurrence of early 

 frost in 1006. Evidently the chief need of the soil, long 

 in cultivation, was for nitrogen. Phosphoric acid was also 

 needed. A mixture of cotton seed meal and acid phos- 

 phate, (plot 5). in all cases gave a profitable increase. In a 

 complete fertilizer in 1005 and 1006 kainit increased the 

 yield to the extent of 112 and 77 pounds of seed cotton 

 respectively; but when used alone or in combination with 

 either one of the other fertilizers, kainit was usually un- 

 profitable, and it was also without eifect in the complete 

 fertilizer in 1907. 



