37 



Lbs. Lbs. 



Average yield of seed cotton per arre, unfertilized 640 530 



Increase of seed cotton when cotton seed meal was added: 



To unfertilized plot 112 210 



To acid phosphate plot — 20 402 



To kainit plot — 20 — 20 



To acid phosphate and kainit plot 239 230 



Average increase tvith cotton seed meal 78 206 



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



To unfertilized plot 120 370 



To cotton seed meal plot — 12 462 



To kainit plot —93 268 



To cotton seed meal and kainit plot 166 230 



Average increase with acid phosphate 45 333 



Increase of seed cotton per acre when kainit was added: 



To unfertilized plot 94 126 



To cotton seed meal plot — 38 140 



To acid phosphate plot — 119 21 



To cotton seed meal and acid phosphate plot 140 — 92 



Average increase ivith kainit 19 50 



Cullman County^ 2 Miles South west of Joppa. 



O. G. Roberts, 1906-7-8. (See Table, p. 39.) 

 Gray sandy upland with yelloio clay suhsoil. 



The original growth was short leaf pines and hardwoods, 

 characteristic of the Mountain Plateau Region. This field 

 had been cleared for about 24 years. 



In all three years the largest profit was made on plot 5 by 

 using a mixture of cotton seed meal and acid phosphate. In 

 every case there was no advantage in adding kainit to the 

 other two chemicals. This inefficiency of potash in these 

 tests is further borne out by the fact that, of the two com- 

 plete fertilizers, the one with the smaller amount of potash 

 each year afforded the larger yield. These results also agree 

 with the results of Mr. Burleson's tests on similar gray pla- 

 teau soil. 



