34 



picking and ginning of increase, was |11.59. Cotton seed 

 meal was highly profitable in spite of the fact that the pre- 

 ceding pea crop had supplied a large amount of nitrogen. 

 Kainit was useless, if not indeed injurious. 



Increase of seed cotton when cotton seed meal was added: 



To unfertilized plot 448 lbs. 



To acid phosphate plot 323 lbs. 



To kainit plot 163 lbs. 



To acid phosphate and kainit plot 142 lbs. 



Average increase with cotton seed meal 244 lbs. 



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



To unfertilized plot 272 lbs. 



To cotton seed meal plot 147 lbs. 



To kainit plot 208 lbs. 



To cotton seed meal and kainit plot 187 lbs. 



Average increase with acid phosphate 203 lbs. 



Lnorcase of seed cotton per acre when kainit was added: 



■ To unfertilized plot 42 lbs. 



To cotton seed meal plot — 243 lbs. 



To acid phosphate plot — 22 lbs. \ 



To cotton seed meal and acid phosphate plot — 203 lbs. . 



Average decrease with kainit 106 lbs. 



^Experiment Made by L. Long^ Long P. O., Perry County, 



IN 1902. 



Worn red prairie loith some sand. 



For yields and increase see table on page 36. 



This soil had been uncultivated for several years, but had 

 borne two crops of cotton just before the experiment was 

 made. With a mixture of cotton seed meal and phosphate 

 (plot 5) the increase was 360 pounds, affording a net profit 

 of $5.48 per acre. Acid phosphate seems to have been the 

 •^fertilizer chiefly needed, and the addition of cotton seed 



