24 The Bulletin. 



Nitrogen, N (Plats 1, 3- and 1). The average results during six 

 years on the plats in Fields A and B show decreased yields and value 

 of product, while for one year in Field C there was a gain from the 

 use of nitrogen, the average results for the plats in the three fields 

 during the seven years being an actual loss in both yield and value 

 of product from the application of nitrogen alone. The loss was 

 $2.84 annually. 



Phosphoric Acid, P (Plats 2, 4^ and 2). Phosphoric acid alone 

 produced increased yields in all of the seven years on the plats in the 

 three fields, the average increase for four years in Field A being 

 419.3 pounds of seed cotton; for two years in Field B 422.5 pounds; 

 and for one year in Field C 570 pounds, or an average for the seven 

 years in all three fields of 441.8 pounds, worth at 41/2 cents per 

 pound $18.48 per acre annually over cost of fertilizer. 



Potash, 'IL (Plats 3, 6^ and 3). From potash alone the average 

 increased yields in the three fields were 65, 96.3, and 145 pounds of 

 seed cotton respectively, or an average of 85.4 pounds for all three 

 fields for the seven years, valued at $3.34 annually over the cost of 

 fertilizer. 



Nitrogen and Phosphoric Acid, N P (Plats 5, 7^ and 4). [N'itro- 

 gen and phosphoric acid alone gave increased yields over the unferti- 

 lized plats for all seven years on the plats in the three fields, the 

 annual average increase for the four years in Field A being 667.4 

 pounds; for two years in Field B 320.2 pounds; and for one year in 

 Field C 330 pounds, or an average annual increase for seven years 

 in three fields of 520.1 pounds, worth $19.69 over the cost of ferti- 

 lizer. This is $1.21 more than the value of the increase produced 

 by phosphoric acid alone, showing that nitrogen has added but little 

 to the yield and profit over what phosphoric acid alone gave. 



Nitrogen and Potash, N K (Plats 6, 8^ and 5). From an appli- 

 cation of nitrogen and potash combined there were small average 

 increased yields on all plats in the three fields, the average for the 

 seven years being 96.5 pounds of seed cotton, worth $1.53 over cost 

 of fertilizer, which is $1.81 less than the average for potash alone. 



Phosphoric Acid and Potash, P K (Plats 7, 9^ and 122). pj^os- 

 phoric acid and potash combined gave increased yields on all the plats 

 in the three fields, the average annual increase for four years in 

 Field A being 637.5 pounds; for two years in Field B 620.3 pounds; 

 and for one year in Field C 465 pounds, or an average for the seven 

 years in the three fields of 608 pounds, worth $25.46 over cost of 

 fertilizer, which is $6.98 more than the average value of increase 

 from phosphoric acid alone. 



Phosphoric Acid, Potash, and Nitrogen, N P K (Plats 8, 10^ and 

 C). These three materials combined in a complete fertilizer gave 

 increased yields in all the tests on all the plats in three fields, the 



