Dec. 1909.] 



POTASH IN CLAY LOAM SOILS. 



41 



No proportional relation could be seen between the yields of 

 hay, or the percentages of potash in the crop, and the potash in 

 the corresponding soils. But instead, it was noted that the per- 

 centages of potash in the crop were sufficiently uniform to make 

 the total potash absorbed by the crop directly proportional to the 

 yield of hay. 



Table II. — Yield of Hay 2)er Acre and the Potash Absorbed by it 



1905* 



Sample. 



Yield of Hay. 



Per cent. 

 Potash. 



Potash 

 Absorbed. 



I 



VI... 

 VII.. 

 VIII, 

 IX... 



X 



XIII. 

 XV.. 

 XVI. 

 XVII 



II.... 

 Ill .. 



IV... 



v.... 



XI.. 

 XII.. 



2,875 

 4,419 

 4,802 

 2,809 

 2,246 

 1,921 

 3,876 

 2.703 

 2,587 

 4.056 

 2,257 

 4,461 

 4,450 

 3,119 

 5,717 

 3,555 



lbs. 



0.84 

 1.02 

 1.18 

 1.29 

 1.24 

 1.31 

 1.27 

 1.40 

 1.65 

 0.98 

 1.46 

 1.01 

 0.79 

 1.14 

 1.47 

 1.08 



24.37 

 45.05 

 56.67 

 36.23 

 27.85 

 26.46 

 49.23 

 37.81 

 42.68 

 39.75 

 32.95 

 45.05 

 35.17 

 35.53 

 84.04 

 38.39 



lbs. 



In July, 1906, samples of hay were again taken from seven 

 of the localities tested in 1905, but the soils were not sampled. 

 The results of the crop analyses were similar to those of the 

 previous year, showing in general that the potash removed from 

 the soil was proportional to the size of the crop. These results 

 on comparatively old fields indicated that the limitations in yield 

 were not due to lack of potash in the plant-food, which the 

 crops could secure. 



Table III. — Yield of Hay per Acre and the Potash Absorbed^ 1906. 



Sample. 



vi.»i.4 .^f TT«,T Percent. Potash 



Yield of Hay. , potash. ; Absorbed. 



VII..., 



IX 



X 



XVII 

 XVIII 

 XL... 

 XIV... 



• (Correction.) In table 5, page 267, Biennial Report, 1907-1908, the figures In the 

 column Yield of Hay are by mistake those for dry matter. Fhe numbers should be 

 hose of the corresponding samples in the above table. 



