336 Fertilizers 



safe plan, the proportions to be determined by their rela- 

 tive cost. In the case of phosphoric acid, superphosphate 

 is to be preferred to materials of an organic or mineral 

 nature, which are not immediately available. Of the 

 potash salts, no particular difference is observed in the use 

 of the different forms. The form to be secured is to be 

 based upon the price of the different forms." 



Formulas for cotton fertilizers. 



While the most judicious proportions of soluble phos- 

 phoric acid, of potash and of nitrogen in a complete 

 fertilizer cannot be said to have been determined with 

 entire accuracy, the carefully conducted experiments of 

 both the Georgia and South Carolina stations indicate 

 that for general use 1 part of nitrogen, 1 of potash and 

 2f or 3 of phosphoric acid indicate the best proportions. 

 The amount of fertilizer that may be profitably used very 

 naturally varies widely, though medium rather than 

 very large dressings are recommended, not so much be- 

 cause the plant under good soil conditions could not appro- 

 priate and use to advantage large amounts, but because 

 on the whole, soils used for cotton are peculiarly lacking 

 in those qualities which enable the proper distribution 

 and appropriation of the larger quantity. For those soils, 

 then, the amounts per acre indicated by the Georgia 

 Experiment Station are annually 



Nitrogen 20 Ib. 



Available phosphoric acid 70 Ib. 



Potash 20 Ib. 



The South Carolina Experiment Station recommends 

 an acre application of 



