The Bulletin 79 



kesults with cotton at statesville. 



Ejfect of Nitrogen, Phosphoric Acid, Potash and Lime Alone and in 

 Combination with each other on Cotton Yields. — These experiments, 

 the results of which are presented in Table VIII, were planned and 

 carried out in the same general way as those with corn at the Central 

 Farm, located at Raleigh. 



JSTitrogen, 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, Avhile 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 pro- 

 duced 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 414 cents per pound $18.48 per 

 acre annually over cost of fertilizer. 



Potash, K (Plats 3^ 6^ and 3). From potash alone the average in- 

 creased 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, IST P (Plats 5, 7^ and 4). Nitrogen 

 and phosphoric acid alone gave increased yields over the unfertilized 

 plats for all seven years on the plats in the three fields, the annual aver- 

 age 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 fertilizer. This is $1.21 more 

 than the value of the increase produced by phosphoric acid alone, show- 

 ing 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 applica- 

 tion of nitrogen and potash combined there were small average in- 

 creased 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 ferti- 

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



Phosphoric Acid and Potash, P K (Plats 7, 92 and 122). Yhoa- 

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

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

 results in the three fields of 608 pounds, worth $25.46 over cost of fer- 

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

 phosphoric acid alone. 



Nitrogen, Phosphoric Acid, and Potash, N P K (Plats 8, IO2 and 6). 

 These three materials combined in a complete fertilizer gave increased 

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

 average increase for four years in Field A being 712.5 pounds of seed 



