26 



Increase of seed cotton per acre when kainit was added: 



To unfertilized plot 78 lbs. 



To cotton seed meal plot 74 lbs. 



To acid phosphate plot 73 lbs. 



To cotton seed meal and acid phosphate plot.. 186 lbs. 



Average increase with kainit 102 lbs. 



The chief need of cotton on this soil was for acid phos 

 phate. Although there was no rust, the addition of kainit 

 to the phosphate was profitable. The conditions in this 

 test did not give to cotton seed Efteal a fair opportunity to- 

 show the favorable effects that may usually be expected of 

 it on this soil. Yet a complete fertilizer t, as the most 

 profitable, plot 10 leading with a net profit of |6.90 per acre- 

 after paying for fertilizers and for picking and ginning the 

 increase, on the basis of lint at 8 cents and cotton seed at GO' 

 cents per hundred pounds. 



O* 



Experiments Made in 1902, 1903, and 1904 by H. D. N. 



Wales^ Huntsville. 



Red clay soil and suhsoil. 



The excessively long dry period from April to August ren- 

 dered all fertilizers ineffective in 1902, For yields and in- 

 crease of crop see table on page 24. The 1903 ex per' nic at 

 was preceded by two corn crops in succession. Tluii. year 

 the largest yield resulted from the use of a mixture of acid 

 phosphate and cotton seed meal. Kainit was of little or • <>• 

 use in combination, but on plot 4 it seemed useful v, iien 

 used alone. There was no rust. Mr. Wales thinks that 

 early frost cut off one-half of the expected yields on yU)t>- 

 9 and 10, and did less injury on other plots. 



In 1904 the experiment was on similar soil, that had 

 borne a crop of cowpeas three years before and then had" 

 been uncultivated for two years. The largest yield was 

 again obtained from plot 5, fertilized with 200 pounds of 



