29 



the single applications, acid phosphate was the most profitable. 

 Kainit was not needed. 



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



To unfertilized plot 168 lbs. 



To acid phosphate plot 176 lbs. 



To kainit plo!; 144 lbs. 



To acid phosphate and kainit plot 40 lbs. 



Average increase with cotton seed meal 132 lbs. 



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



To unfertilized plot 224 lbs. 



To cotton seed meal plot 232 lbs. 



To kainit plot 56 lbs. 



To cotton seed meal and kainit plot — 48 lbs. 



Average increase with acid phosphate 116 lbs. 



Increase of seed cotton per acre when kainit was added: 



To unfertilized plot 136 lbs. 



To cotton seed meal plot 112 lbs. 



To acid phosphate plot — 32 lbs. 



To cotton seed meal and acid phosphate plot — 168 lbs 



Average increase with kainit 12 lbs. 



Increase from use of cotton seed meal 40 lbs. 



Increase from use of nitrate of soda 72 lbs. 



Nitrate better by 32 lbs. 



JEFFERSON COUNTY, 10 MILES NORTHEAST OF 



BIRMINGHAM. 



G. C. Depoister. 



Gray gravely loam with red clay subsoil. 



This land has been cleared only five years. Corn was the 

 preceding crop. There was no damage done from rust or in- 

 sect attacks. There was a good stand. 



The most profitable fertilizer was acid phosphate and kainit,. 

 $8.74 per acre, or 284 per cent profit on the investment. The 

 most profitable single fertilizer was acid phosphate, $3.18, or 

 189 per cent profit on the investment. The average estimated 

 increase in seed cotton per acre was 97 pounds from cotton 

 seed meal, 186 pounds from acid phosphate, and 77 pounds- 

 from kainit. 



