1891.] 



PUBLIC DOCUMENT — No. 33. 



191 



As a first year's results, the above statements are reported 

 without any further comment, beyond the remark that the 

 dryness of the season renders the advantages of a soluble 

 form of phosphoric acid very striking. The experiment 

 will be repeated during the coming season. Winter wheat 

 has been sown, to continue the inquiry. One year's results 

 cannot furnish a basis for a final decision. The varying 

 accumulation of phosphoric acid in the soil is an important 

 fact, which deserves a serious consideration as the investi- 

 gation advances. 



Plat I. received 24.18 pounds of phosphoric acid. 

 Plat II. received 28.01 pounds of phosphoric acid. 

 Plat III. received 109 .68 pounds of phosphoric acid. 

 Plat IV. received 36.12 pounds of phosphoric acid. 

 Plat V. received 12.34 pounds of phosphoric acid. 



The largest yield of potatoes has only removed 3.392 

 pounds of phosphoric acid from the soil. 



Tabular Statement of the Approximate Amount of Nitrogen, 

 Phosp>horic Acid and Potash in the Crop raised. 



The calculation is based on E. WolflT ' s average analyses, 

 1,000 pounds of potatoes containing : nitrogen, 3.4 pounds ; 

 phosphoric acid, 1.6 pounds ; and potassium oxide, 5.8 

 pounds. 



