

AGRICULTURAL EXPERIMENT STATION. IT, 



and phosphoric acid determined, with the following result : Potash, 

 0,096 per cent; phosphoric acid, 0.012 per cent. 



One hundred and twenty pounds of sand were used in each box. 



For each kind of plant studied nine boxes were used, in three 

 sets of three boxes each. 



The three boxes of each set received the following manuring per 



box : 



s T ( 8.5 grams nitrate of soda = 1.36 grams nitrogen. 

 s i J 2.6 grams muriate of potash = 1.36 grams potash. 



f- 8.5 grams nitrate of soda = 1.36 grams nitrogen, 

 o TT j 2.6 grams muriate of potash = 1.36 grams potasb. 



I (3.96 grams insoluble phosphoric acid. 



1.17.0 grams South Carolina rock = 0.3:1 grams citrate soluble phosphoric 



( acid. 



f 8.0 grams nitrate of soda = 1.36 grams nitrogen. 

 I 2.6 grams muriate of potasb = 1.36 grams potash. 



Set Ill| luble phos- 



I _ phone acid. 

 (.28.5 grams acidulated South Carolina rock = \ °- 50 ?l "f l ]' ( ^ y'ho^i^a, 8 ^ 1316 



I 0.62 grams insoluble phos- 

 l phoric acid. 



It will be seen that all of the boxes were treated alike with refer- 

 ence to potash and nitrogen, that the plants grown in Set I were 

 dependent on the phosphoric acid originally in the sand, that those 

 grown in Set II had in addition 4.32 grams of phosphoric acid, 

 mostly insoluble, supplied by crude finely ground South Carolina 

 rock, and that those grown in the boxes of Set III had in addition 

 to that originally contained in the sand 4.46 grams of phosphoric 

 acid, mostly soluble, supplied in acidulated South Carolina rock. 



The plants thus far studied have been wheat, barley, corn, beans, 

 peas, potatoes and turnips. 



Wheat was planted in the boxes of Set I A, Set II A and III A. 



Bailey '• " Set I B, Set II B and III B. 



Corn '•' " Set I C, Set II C and III C. 



Beans " " Set I D, Set II D and III D. 



Peas " " Set I E, Set II E and III E. 



Potatoes " ' l Set I F, Set II F and III F. 



Turnips " " Set I G, Set II G and III G. 



After planting, the boxes were under the care of a man experi- 

 enced in growing plants under glass. Water was supplied as it 

 was believed to be needed. At the proper time the plants were 

 thinned so that the boxes haviDg the same kind of plants contained 

 the same number of plants to the box. 



The plants were allowed to grow to maturity. Immediately 

 before harvesting, the crops were photographed and plates made 



