142 COTTON 



4. Acid phosphate is usually our most economical 

 carrier of phosphorus. 



5. Muriate of potash is an economical carrier of 

 potassium. 



6. Kainit, which contains only one-fourth of the 

 quantity of potassium found in muriate, is usually 

 preferred in cotton manures because it is believed 

 to be beneficial in warding off rust. 



7. Nitrogen is especially concerned with the 

 growth of leaves and stems. If your cotton leaves 

 and stems have been small, therefore, and the 

 nitrogen supply in the soil has not been increased 

 by the growth of some leguminous crop, it would 

 be well to increase the nitrogen content of the 

 formula you select. On the other hand with 

 marked growth of leaf and stem, the quantity of 

 nitrogen in any formula may be decreased or alto- 

 gether abandoned. 



8. When cotton follows clover, cowpeas, or other 

 legumes, little or no nitrogen will be required in 

 the fertilizer. 



9. When stem and leaf growth are abundant, but 

 yield of seed and lint below what it should be, 

 phosphorus and potassium especially the former 

 are needed. 



10. In a general way, on average cotton soils 

 the best results are obtained when nitrogen, phos- 

 phorus, and potassium are combined in the propor- 

 tion of about three or three and one half parts 

 phosphorus, one part nitrogen and one part 

 potassium unless the nitrogen be already sup- 

 plied by leguminous crops. 



THE FORMULA TO USE 



It is impossible to suggest a formula, or even 



