CO-OPERATIVE FERTILIZER EXPERIMENTS 

 WITH COTTON IN I897. 



J. F. DUGGAU. 



SUMMARY. 



Under the direction of the Alabama Experiment Station 

 fertilizer experiments with cotton, or "soil tests/' were 

 made in thirty localities in the State. The object was to 

 learn, the best fertilizers for the different classes of soil. 



Two hundred pounds per acre of cottonseed meal wais 

 used to furnish nitrogen, 240 pounds of acid phosphate to 

 supply phosphoric acid, and both one hundred and two hun- 

 dred pounds of kai-nit to afford potash. These fertilizers 

 were applied singly, in pairs, and all three together. 



Of these experiments twenty-two afforded definite indi- 

 cations of the manurial needs of the soils on which they 

 were made. 



Phosphoric acid was most effective on eight soils, potash 

 on four soils, nd nitrogen on four soils; phosphoric acid 

 and nitrogen were about equally beneficial in two experi- 

 ments, and four soils stood greatly in need of all three fer- 

 tilizer constituents — nitrogen, phosphoric acid and potash. 



The experiments i'n which phosphoric acid was most ef- 

 fective were located near Tuskaloosa, Tuskaloosa county; 

 Clanton, Chilton county; Sterrett, Shelby county; Town 

 Creek, Lawrence county; Lumber Mills, Butler county; 

 Prattville, Autauga county; Brewton, Escambia county; 

 and Burnt Corn, Monroe county. 



The experiments in which potash proved most effective 



