27 



cotton seed meal and 240 pounds acid phosphate. Mi\ 

 Wales added an eleventh plot fertilized with 200 pounds, 

 acid phosphate and 100 pounds cotton seed meal, the yield 

 of which was G84 pounds, or practically as good as plots 9 

 and 10, containing kainit and a larger amount of cotton 

 seed meal. Cotton seed meal was highly profitable when 

 employed in combination, but less useful alone. Kainit 

 was generally useless. In view of results recorded in this, 

 bulletin and in those obtained in previous experiments on 

 typical red upland Tennessee valley soil, I would suggest a& 

 a general fertilizer for cotton on that soil 

 80 to 120 lbs. cotton seed meal per acre, 

 160 to 240 lbs acid phosphate per acre. 



240 to 360 lbs. total per acre. 



If the cotton stalks grow very small it might be advisabla 

 to increase the proportion of cotton seed meal to one- 

 half of the mixture. 



Increase of seed cotton per acre when cotton seed meal was 



added: 



1902 1903 1904 



To unfertilized plot 56 lbs. 216 lbs. 64 lbs. 



To acid phosphate plot 13 lbs. 32 lbs. 405 lbs. 



To kainit plot 67 lbs. 88 lbs. 367 lbs, 



To acid phosphate and kainit plot 55 lbs. 112 lbs. 179 lbs. 



Average increase with cotton seed meal. . 47 lbs. 112 lbs. 253 lbs, 

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



To unfertilized plot 24 lbs. 288 lbs. 120 lbs, 



To cotton sed meal plot ..—19 lbs. 104 lbs. 462 lbs, 



To kainit plot —33 lbs. lbs. 186 lbs. 



To cotton seed meal and kainit plot 21 lbs. 24 lbs. —2 lbs, 



Average increase with acid phosphate .. 14 lbs. 104 lbs. 167 lbs, 



