1911.] PUBLIC DOCUMExXT — No. 31. 45 



feared so doing would cause the newly seeded grass and clover 

 to lodge, to two of these plots. JManure at the rate of 3 cords 

 per acre, together with high-grade sulfate of i)otash at the rate 

 of 100 pounds per acre, was applied to the other two plots 

 from 1890 to 1895. Since the latter date the manure has been 

 applied to these plots at the rate of 4 cords per acre in connec- 

 tion with 160 pounds of high-grade sulfate of ])otash, and 

 whenever, for the reasons above stated, the a])plicati(in of ma- 

 nure has been omitted from the other two i)lots, both the numuro 

 and the potash have been withheld from these plots. The plan 

 of cropping this field for the last twelve years has been corn 

 and hay in rotation in periods of two years for each. During 

 the i^ast season the crop on this iield has been hay, and the 

 average yields per acre have been as follows : — 



Pouuds. 



Manure alone : — 



Hay, 4,4,S() 



Rowen, . 1,050 



Manure and jjutash : — 



Hay, 4,400 



Rowen, 940 



The rowen crop of the past season was very small, owing to 

 the marked deficiency in rainfall. The corn crops raised in 

 this field throughout the entire period of the experiment have 

 been very nearly equal under the differing manurial treat- 

 ments. The hay crops have usually been somewhat larger with 

 the manure alone. The difference during the past season is 

 considerably less than the average. 



VII. Average Corn Fertilizer coMrARED avitii Ferti- 

 lizer Richer in Potash. 

 These experiments occupy what is known as the north corn 

 acre. They have been in progress since 1891. This field, like 

 the south corn acre, is divided into four plots of one-fourth 

 acre each. Two of the plots receive a mixture furnishing ni- 

 trogen, phosphoric acid and potash in the same proportions in 

 which they are contained in the average corn fertilizers offered 

 in our markets. The other two plots annually receive an ap- 



