New York Agricultural Experiment Station. 241 



This material has shown no tendency to agglutinate and with 

 proper water conditions its texture has appeared to offer no 

 obstruction to free root growth. 



The pots. — The plants were grown in galvanized iron pots. 

 They contained 25 pounds of sand and 4 to 6 pounds of drainage 

 material, the latter consisting of quartz chips. Aeration was 

 secured by connecting the drainage with glass tubes extending 

 up the side of the pots above the sand. 



Kinds and quantities of plant-food applied. — The general scheme 

 of food supply may be easily understood, perhaps, through the 

 following form of statement: 



OrJei- in the series. Method of treatment. 



1 Received complete fertilfzer. 



2 Received complete fertilizer, soda excepted. 



3 Received complete fertilizer, potash excepted. 



4 Received complete fertilizer, potash and soda excepted. 



5 Received only nitrogen. 



6 Received nothing. 



This arrangement was adopted wholly with reference to studj''- 

 ing the influence upon the plant of depriving it of all but a very 

 limited supply of potash, or of soda, or of both potash and soda, 

 when all other compounds necessary for growth were present in 

 suflScient quantities. Outside of these variations, conditions 

 were made as uniform as possible. 



The tabular arrangement which follows shows very clearly 

 the kinds and quantities of compounds added to each pot in the 

 series of six. 



Table I. — Kinds and Amounts of Fertilizing Materials Added to 



Each Pot. 



IG 



