1898.] PUBLIC DOCUMENT — No. 33. 135 



results with potash-magnesia sulphate as the main potash 

 sources of a tobacco fertilizer are not encouraging. 



7. The diflerence noticed in the color of ash, etc., incase 

 of the crop being raised upon diiferent plots, is in several 

 instances so slight that an attempt to classify the various fer- 

 tilizers used with reference to their superior fitness on the 

 basis of color and compactness of ash cannot be otherwise 

 than arbitrary. With this qualification in mind, the following 

 classification is ofiered for the consideration of parties en- 

 gao;ed in the cultivation of tobacco in our section of the 

 country : — 



First Class. 



Plot 4. — Nitrate of soda, cottou-seed hull ashes and castor 

 pomace. 



Plot 3. — Nitrate of soda, cotton-seed hull ashes and cotton- 

 seed meal. 



Plot 9. — Nitrate of potash, cotton-seed hull ashes and cotton- 

 seed meal. 



Plot 10. — Nitrate of potash, carbonate of potasli-magnesia and 

 phosphatic slag. 



Second Class. 



Plot 6. — Nitrate of soda, higli-grade sulphate of potash, cotton- 

 seed meal and dissolved boue-black. 



Plot 8. — Nitrate of soda, high-grade sulphate of potash, linseed 

 meal and dissolved bone-black. 



Plot 7 . — Nitrate of soda, high-grade sulphate of potash, castor 

 pomace and dissolved bone-black. 



Third Class. 



Plot 1. — Nitrate of potash, potash-magnesia sulphate, cotton- 

 seed meal and dissolved bone-black. 



Plot 2. — Nitrate of potash, potash-magnesia sulphate, castor 

 pomace and dissolved bone-black. 



The observations with barn-yard manure have not been 

 considered in the above classification ; they are very en- 

 couraging, but not sufficient in number to permit detailed 

 discussion in this connection; besides, the amount of barn- 

 yard manure used in our experiment, ten tons per acre, con- 

 tained nearly two hundred pounds of potassium oxide and 



