19S THE SYSTEM OF FARM-YAED MANURING. 



between the nutritive substances for the barley-corn had 

 increased from 12 to 22. 



In the third year, the roots of the barley, for the same 

 length, found scarcely half as much nutriment for grain 

 as the rye had found. 



This exposition is not intended to supply a standard 

 for measuring the distances between the available parti- 

 cles of nutritive substances in the ground, but merely to 

 define more accurately what is meant by the exhaus- 

 tion of land. The farmer who has a clear view of the 

 causes upon which depend the reduction of crops by con- 

 tinuous cultivation, will thereby the more easily find out 

 and apply the means to make his field as productive as 

 before, and, if possible, even to increase its fertility. 



Beside the general differences of all the crops in the 

 Saxon experiments, we are further struck with the 

 inequahty in the proportion of corn and straw. 



To 10 parts by weight of corn, the yield of straw was 

 respectively — at Cunnersdorf 25 parts by weight, at 

 Kotitz 23, at Oberschona only 21, and at Miiusegast 

 only 20. 



A more careful examination of the table shows that 

 the difference is mainly in the produce of corn. 



The fields at 



Cunnersdorf Kotitz Obcrbobritzsch 



yielded in straw . 2951 lbs. 3013 lbs. 3015 lbs. 



that is, within a few pounds, the same quantity of straw^ 

 while the amount of corn was in 



Cunnersdorf Kotitz Oberbobritzsch 



11 : 12 : 14 



In investigating the reasons for this inequality in the 

 produce of corn, we discover at the same time the causes 

 of the difference in the proportion between the corn and 

 straw. 



It is necessary to remember that what is calle<l straw 



