The Bulletin. 



37 



Continued. 



YEARS IN FIELDS A, B AND C. 



or decrease in the natural fertility between check plats, and a corrected check was figured on 

 this basis for each treated plat between checks. 



the most profitable quantity of phosphoric acid to use for cotton on 

 this soil, as the results previously reported (June, 1910, Bulletin) 

 did for peas. The results on all of the fields, as well as the averages, 

 show that one-half the normal quantity of phosphoric acid is not suf- 

 ficient for best returns. The largest average increased yield of seed 

 cotton was from the heavy application of acid phosphate (600 pounds 

 per acre) along with the normal quantities of potash and nitrogen, 

 though the largest profit, when cost of fertilizer is considered, was 

 from the normal fertilizer application containing 200 pounds of acid 

 phosphate. The experiments are being continued according to the 

 same plan on these several fields and the results from year to year will 

 no doubt throw additional light on this, as well as other phases of the 

 problem of the best and most profitable fertilization for cotton. 



