25 



•Exi'Kui.MKXT Madk IX 1001 I'.Y Clarendox Davis, Huntsvillb. 



-lied iiijland soil and subsoil, characteristic of the Tennessee 



valley. 



Ths field had been in cultivation for many years. The 

 preceding crop was wheat, itself preceded by cowpeas. Ex- 

 -«essive shedding of forms, due to continued heavy rains in 

 August, and the occurrence of light but damaging frost 

 September 18th, reduced the yield on all plots, but more 

 on the plots fertilized heavily and on those receiving cotton 

 seed meal. The early frost and the residual fertilizing 

 effects of the cowpeas probably explain the slight effects of 

 cotton seed meal, to which in combination with acid phos- 

 phate, cotton usually responds profitably on this grade of 

 soil. For yield of seed cotton see page 24. That table 

 shows that the increase in seed cotton per acre was as fol- 

 lows : 



Increase of seed cotton per acre when cotton seed meal wa3 

 •kidded : 



To unfertilized plot — 96 lbs. 



To acid phosphate plot 58 lbs. 



To kainit plot —100 lbs. 



To acid phosphate and kainit plot 171 lbs. 



Average increase with cotton seed meal 8. lbs. 



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



To unfertilized plot 96 lbs. 



To cotton seed meal plot 250 lbs. 



To kainit plot 91 lbs. 



To cotton seed meal and kainit plot 362 lbs. 



Average increase with acid phosphate 199 lbs. 



