THE EXPERIMENT STATION 91 



Among the many conclusions drawn may be men- 

 tioned the following: 



(1) A careless use of cultivator or hoe checks growth 

 of plants and modifies their structure and general 

 character. 



(2) Different fertilizer combinations have had less 

 effect upon the quantity than upon the quality of 

 the crop. New land naturally suited to tobacco 

 and cropped for a number of years to exhaust the 

 available plant-food, served much better for the 

 experiment than land upon which tobacco had been 

 continuously grown and which had been heavily 

 fertilized. 



(3) Cottonseed and linseed meals and castor pomace 

 all proved equally desirable sources of nitrogen when 

 used in connexion with nitrate of soda or potash. 



(4) Nitrate of soda, used together with acid phos- 

 phate or dissolved boneblack, proved more satisfactory 

 than nitrate of potash. 



(5) Cottonseed hull ashes and high-grade sulphate 

 of potash proved the most valuable potash sources, 

 the former being preferred in most cases. Nitrate 

 of potash was very satisfactory when used in com- 

 bination with an alkaline phosphate such as basic 

 slag or with carbonate of potash-magnesia. Sul- 

 phate of potash-magnesia did not give satisfactory 

 results. 



Other interesting observations concerning the prob- 

 able effect of fertilizers on colour of ash, observations 

 with barnyard manure, etc., will be found in the 

 bulletin. 



