100 



THE SOIL. 



In lysimeters I. and II. nearly the same quantities 

 of water percolated through the earth ; in the two 

 others the difference is great ; the two former alone, 

 therefore, admit of comparison as regards the solvent 

 power of the water. 



These experiments show that less than one-half of 

 the rain falling on the field under the given conditions, 

 reached a depth of 6 inches ; and that, calculating for 

 1 million parts of water, the unmanured soils I. and II. 

 gave respectively 2*37 and 2'03 pounds, the manured 

 soils III. and IV. 5*46 and 3*82 pounds of potash. The 

 quantities of potash in the manured soils do not exceed 

 the average quantity of potash found in drainage- 

 water (Krocker). 



The barley grown in the earth of lysimeter II. pro- 

 duced, per square metre, 137*3 grammes (2120 grains) 

 of barley-corns, and 147*9 grammes (2272 grains) of 

 straw, containing in their ashes (the corns in 2*47 per 

 cent., the straw in 4*95 per cent, of ash) : 



In the corns 

 " straw 



Total 



. 0*823 grammes 12-6 grains of potash 

 . 1-410 " 21-8 " " 



2-233 



34-4 



The quantity of potash absorbed by the water from 

 the earth in the first lysimeter, which was not sown 

 with barley, amounted altogether to 0.516 gramme (8*0 

 grains) ; in the second lysimeter to 0*434 gramme (6*7 



