The Bulletin. 



23 



Continued. 



YEARS ON FIELDS A, B AND C. 



AVERAGES. 



there is a uniform increase or decrease in the natural fertility between'check plats, and a cor- 

 rected check was figured on this basis for each treated plat between checks. 



acid and potash (P K), and when all three of the fertilizing constit- 

 uents were applied to make a complete fertilizer (N P K) ; also to 

 test the effect of lime (L) when used alone and when used in con- 

 nection with a complete fertilizer (]^PKL). The results are 

 shown in yields of seed cotton per acre for the several years, average 

 yields, average increases over the unfertilized (O) plats which rep- 

 resent the effect of the fertilizer applications, the value of increase, 

 cost of the fertilizer, and value of the increased yields over cost of 

 fertilizer. 



