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 l)een 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 i^ounds of phosphoric acid. 



The largest yield of potatoes has only removed 3.392 

 pounds of phosphoric acid from the soil. 



Tabular Statement of the Ajjproximate Amount of Nitrogen^ 

 Phosplioric Acid and Potash in the Crop raised. 



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

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

 phosphoric acid, 1.6 pounds; and potassium oxide, 5.8 

 pounds. 



