204 



THE SYSTEM OF FARM-YAKD MANURING. 



of corn and straw in the former is expressed by K-f aK St, 

 the crop in the latter=l JK-[-lg«K S^. 



The fields are evidently cultivated in both places with 

 great care and skiU, and the soil is so uniformly mixed, 

 that when we know the corn and straw crop of the one, 

 and the straw crop of the other, we can calculate tlie corn 

 crop of the latter from the above formula. 



Potatoes, 1852. — In the subjoined table, the vertical 

 lines show the potato crops from the five different fields in 

 the year 1852. 



1852. Potatoes. 

 Cunnersdorf, Mausegast, Kotitz, Oberbobritzsch, Oberschoua. 



The potato plant draws its principal constituents from 

 the arable surface soil, and from a somewhat deeper layer 

 than the rye plant; and tlie crops reaped show the 

 condition of the layers more accurately than could be 

 ascertained by chemical analysis. 



Li the fields at Mausegast and Cunnersdorf the nutritive 

 substances available for the potato plant were about 

 equally close ; in Kotitz they were one-ninth closer to each 

 other ; at Oberbobritzsch they were twice as far asunder ; 

 while at Oberschona they were one-fifth closer than in 

 Oberbobritzsch. 



The largest potato crop was obtained fi^om the field at 

 Kotitz. Potash (for the tubers) and lime (for the lierb- 

 aceous parts) are the predominant constituents of the 

 potato plant : but a certain amount of nitrogen and phos- 



