New York Agricultural Experiment Station. 247 



under water, and previous to using, it was air dried, freed from 

 sticks and then coarsely ground. 



All the boxes except the blanks were supplied with the necessary 

 forms of plant food, the phosphorus as acid phosphate or as raw 

 ground Florida rock varying in fineness from that passing 

 through a sieve 60 meshes to the inch to " floats." The following 

 tables show the kinds and quantities of fertilizing materials 

 applied. The chemicals used were Kahlbaums C. P. 



Table X. — Phosphoric Acid Fineness Experiments: Fertilizer Ingredients 



Used, 1899-1900. 



* Added to all boxes. 



t Added to all boxes but the one receiving acid phosphate. 



It is to be noted that hydrated calcium sulphate was added to 

 all the boxes except those receiving acid phosphate in order that 

 conditions might be entirely alike excepting as to the form of 

 the phosphorus compound. Calcium carbonate was also supplied 

 to all boxes as a means of securing and maintaining the necessary 

 basic condition in an artificial soil of this character. 



The crops used in the experiments of 1899-1900 were barley, 

 crimson clover, peas and rape. 



The results were such that only those with barley and rape 

 seem to be worth reporting, Three successive crops of rape were 



