258 Report of the Department of Chemistry of the 



The graduated quantities of P 2 B and K 2 that were applied to 

 individual boxes in the several experiments had the following range: 



Table III. — Range in Amount of P 2 6 and KjO in Plant-food Requirement 



Experiments. 



Amounts of PiO» and K 2 in Individual Boxes. 



For convenience of reference the above figures are repeated in con- 

 nection with the statement of results. 



As stated, the crops were grown in one of the Station forcing 

 houses. Distilled water, free from mineral compounds, was applied 

 to the various soils, thus holding the food supplied to the plants to 

 the quantities contained in chemicals and other materials used. 



RESULTS OF EXPERIMENTS. 



So far as possible, the various crops were allowed to attain maturity 

 before they were harvested. With the exception of 1900-1 the pro- 

 duction was in general as large as would be secured under field 

 conditions. 



After careful air drying, the entire product of each box was pre- 

 served for analysis. 



Crop production. — The following are the yields of fresh and air- 

 dry material with each box under the variousjmethods of treatment. 



