868 



ANNUAL, REPORT OF THE 



Off. Doc. 



TEST MADE BY THE MAINE EXPERIMENT STATION. 



The Maine Experiment Station has studied the availability of dif- 

 ferent sources of phosphates from two standpoints. 1st. The rela- 

 tive producing capacity of dill'erent forms of phosphoric acid in 

 growing the crops commonly used in the rotation in use in that 

 section, and 2d. Testing the relative ability of dill'erent classes of 

 crops to use dilTerent kinds of phosphates. 



The experiments conducted under the first head have had the 

 results reported from 188G to 1891. Since that time no results have 

 been given in any of the Station publications. The summary of the 

 results of the test are given in the Station Annual Report for 1891, 

 page 129, from which the following table is copied: 



TABLE 21. , 



Yield per Acre of Plots Fertilized with Different Forms of Phosphoric Acid, To- 

 gether With Those of Plots Receiving no Phosphate. 



From this table it will be seen that the dissolved bone black 

 gave the largest total yield of oats, the second largest yield of 

 peas and the smallest yield of hay. Fine ground bone gave the 

 largest yield of hay and peas and stood second in the yield of 

 oats. The ground South Carolina rock stood second in hay and 

 third in oats and peas. 



It would appear from the yield of the stable manure plot that the 

 land used was deficient in organic matter, which would account fof 



