1906.] 



PUBLIC DOCUMENT — No. 33. 



31 



application of manure used alone, as compared with a smaller 

 application of manure used in connection with a potash salt, 

 were begun in 1890. The field used is level, and the soil of 

 comparatively even quality. It is divided into four quarter- 

 acre plots. The crop grown during the years 1890 to 1896, 

 1899 and 1900, 1903 and 1904, has been corn. In 1897 and 

 1898, and again in 1901 and 1902, the crop was mixed grass and 

 clover. Where manure is used alone, it is applied at the rate 

 of 6 cords per acre. Where manure is used with potash, the 

 rates of application are: manure, 4 cords; high-grade sulfate 

 of potash, 160 pounds per acre. Manure alone is applied to 

 plots 1 and 3 ; the lesser quantity of manure and high-grade 

 sulfate of potash to plots 2 and 4. Estimating the manure 

 alone as costing $5 per cord, applied to the land, the money 

 difference in the cost of the materials applied is at the rate of 

 $6.40 per acre, the manure and potash costing that amount 

 less than the larger quantity of manure alone. 



Mixed timothy, red-top and clover was sown in late 

 summer in the standing corn of last year. The following 

 tables show the rates of yield on the several plots and the 

 averages under the two systems of manuring : — 



Yields per Acre, 1905 {Pounds'). 



Plots. 



Rowen. 



Plot 1 (mauure alone), . 

 Plot 2 (manure and potash), 

 Plot 3 (manure alone), . 

 Plot 4 (manure and potasU), 



1,840 

 1,200 

 1,720 

 1,640 



Average Yields per Acre (Pounds). 



It will be noticed that the average yield on the two plots 

 receiving the smaller (juantity of manure and potash is some- 

 what greater than on the other two plots. Since this com- 



