the value per ton would have to increase to $16.00 to 

 balance, which is lower than prevailing prices have been 

 since that year for No. 1 Timothy. 



Crops of 1906. 



The experiment was continued in 1906, on the same 

 areas. In order to insure a constant and abundant 

 supply, mineral fertilizers were again added in the form 

 of wood ashes and acid phosphate, and in the amounts 

 shown in the table, namely, 520 pounds of wood ashes 

 and 578 pounds of acid phosphate per acre on both the 

 fields. 



The applications of Nitrate were, however, reduced 

 from 200 to 168 pounds on the upland; and to 112 

 pounds on the lowland per acre. These fertilizers were 

 all evenly distributed in the spring of 1906. The effect 

 of the Nitrate was again immediately noticeable in in- 

 creasing the vigor of the plants. The yields were as 

 follows : 



Yield of Crops in 1906. 



UPLAND. LOWLAND. 



With With 



Without 168 Ibs. Without 112 Ibs. 



Nitrate. Nitrate Nitrate. Nitrate 



per acre. per acre. 



Yield per acre 3,200 Ibs. 6,240 Ibs. 5,920 Ibs. 8,080 Ibs. 



Increase from Nitrate 3,040 Ibs. 95.0% 2,160 Ibs. 36.4% 



These results confirm those for 1905 on the whole, 

 though there are points of difference which may be 

 reasonably charged to season and to the effect of the 

 growth of the first crop. On the upland, which was 

 poor in humus and Nitrogen, the yield of the plot with- 

 out Nitrate differs but little from that of 1905, while on 

 the lowland, the soil rich in humus, the yield without 

 Nitrate is much lower than in 1905. On the upland 

 the Nitrogen at the disposal of the plant did not exist 

 in easily changeable forms, and hence was not largely 

 exhausted under the energy of the extra mineral food. 

 The lowland, on the other hand, doubtless contained 

 considerable Nitrogen in easily changeable forms, 

 which under the stimulus of the available phosphoric 

 acid and lime was made effective on the^ grass, and 



