32 The Bulletin. 



Effect of Varying Quantities of Potash. 



The experiments reported in Table lY were arranged to show the 

 effect on the yield of seed cotton of varying quantites of potash, the 

 nitrogen and phosphoric acid remaining constant. On one plat only 

 one-half the normal quantity of potash was applied, or l^/i per cent m 

 the fertilizer mixture, or 5 pounds of potash per acre, while on two other 

 plats two and three times the normal quantities were given, or 20 and 

 30 pounds of actual potash per acre respectively. On basis ol the 

 normal fertilizer mixture this would represent 5 and 71/2 per cent o± 

 potash in the mixture. , . 



The yield of cotton on Plat 12, field B, which received one-half normal 

 potash is abnormally high. With this exception, increased amounts ol 

 potash gave increased amounts of cotton on this field. However the 

 increase on field B from the application of three times normal— 30 

 pounds— over twice normal— 20 pounds— was not enough to pay lor the 

 additional fertilizer. For the four years' average on field A, increased 

 amounts of potash gave increased yields and small increased profits, in 

 general it appears that with cotton increasing amounts of potash can 

 hardly be expected to much more than pay for themselves. 



