New YorK AGRICULTURAL EXPERIMENT STATION. QAt 
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: 
Order in the series. Method of treatment. 
1 Received complete fertilizer. 
Received complete fertilizer, soda excepted. 
Received complete fertilizer, potash excepted. 
Received complete fertilizer, potash and soda excepted. 
Received only nitrogen. 
Received nothing. , 
QO wp Wb 
This arrangement was adopted wholly with reference to study- 
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 
sufficient 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. 
Potas- Magne- Ammo- 
Order in Acid sium Sodium sium nium Calcium Ferric 
series. phosphate. nitrate. nitrate. sulphate. nitrate. carbonate. chloride. 
Grams. Grame. Grams. Grams. Grams. Grams. Grams. 
1 aig 5.0 5.0 AS gba y 5.0 1.0 
2 7.5 a8 eye ae eee 2D pag ta 5.0 1.0 
5° felry Sree é 5.0 Pa T 2.00 5.0 1.0 
4 Oa RE Se Er 2.0 4.35 5.0 1.0 
5 Bie C6 OC, 6 0.6.8 e eeevnee e@eeee#re A at eoee42eeg¢ eeeeee 
6 @eeeeee eoeeeste eeeeoe4#0e eev<e#vs#ve eeee#ee#s’:. eee#2es? @eee5e?e@ 
