30 COTTON CULTURE 



supply the three valuable ingredients in this latter pro- 

 portion is as follows : 



Muriate of potash 70 Ibs. 



Acid phosphate (14 per cent) 833 " 



Cotton-seed meal 333 



Nitrate of soda 100 " 



Total i, 33 6 



or, if one should prefer that the formula add up to one ton, 

 then mix as follows : 



Muriate of potash 105 Ibs. 



Acid phosphate (14 per cent) 1,245 



Cotton-seed meal 500 " 



Nitrate of soda 150 " 



Total 2,000 



These formulas are practical summaries of many com- 

 binations of fertilizer which have been fairly successful 

 in actual field tests and are general formulas suggested for 

 average conditions as nearly as can be determined. How- 

 ever, soils differ widely in different sections of the country, 

 and a more detailed study of the treatment of soils is 

 given below. The nature of the soil is not the only point 

 to be noted in compounding a fertilizer. The previous 

 cropping of the soil and its physical character are very 

 important matters. If a rotation is practiced, it has a 

 very considerable bearing on the fertilizer. 



Light, sandy soils, those of the long-leaf ed-pine type, 

 are usually very deficient in potash as well as nitrogen, 

 and especially when worn and old. Therefore, the for- 



