SWEET POTATOES 263 



12. Nitrate of soda, 460 Ibs., bone black, 300 Ibs 208.76 



13. Bone black, 300 Ibs., sulphate of potash, 200 Ibs 255.50 



14. Nitrate of soda, 460 Ibs., bone black, 300 Ibs., and sulphate of 



potash, 200 Ibs 173.36 



15. No fertilizer 170.58 



16. Slaked lime, 4,360 Ibs 250.14 



It will be seen that the best results were from potassic fertilizers and 

 phosphoric acid. Muriate of potash lowered the yield, and nitrate of soda 

 increased it but once. The special sweet potato fertilizer contained a large 

 percentage of phosphoric acid. The analysis of this fertilizer was: Total 

 phosphoric acid, 8.5 per cent.; potash, 1.93 per cent.; nitrogen, 0.80 per cent. 



From our own experience in the fertilization of the sweet potato we 

 would say that this fertilizer was too low in potash for the best results, on the 

 average sandy soil in which the sweet potato is grown in various parts of the 

 country. It will be found that the sweet potato as grown in New Jersew 

 will bear heavier applications of nitrogen than it will in the South. 



