FERTILIZERS FOR COTTON 59 



dium soils use one part of cotton seed meal and 

 two parts of acid phosphate. On thin soils use 

 one part of cotton seed meal and one part of 

 acid phosphate. These proportions are for 

 soils rich in potash, but deficient in nitrogen 

 and phosphoric acid. Experiments have shown 

 that most of the clay soils in the cotton states 

 do not need potash for growing field crops. 

 On soils showing a need of it potash should be 

 added. On some soils experiments have shown 

 that neither acid phosphate nor potash is 

 needed; examples of such soils are found in the 

 black waxy lands of west Alabama, east Mis- 

 sissippi, and Texas, and the stiff alluvial lands 

 of the Mississippi Valley. 



On these soils nitrogen and humus seem to be 

 all that is needed. Deep sandy lands such as 

 are found in Florida and along the coastal 

 plains are in many cases deficient in potash, as 

 well as in phosphoric acid and nitrogen. On 

 such soils a complete fertilizer or one containing 

 nitrogen, phosphoric acid, and potash should 

 be used. 



Amount of Fertilizer to Use Per Acre. No 

 definite instructions in regard to the use of 

 fertilizers can be given to fit all conditions and 



