THE SYSTEM OF FARM-YAKD MANURING. 



constituents to clover, turnips, and the grasses, the in- 

 ference is pretty clear that the quantity of this manure 

 required on a lield is in an inverse ratio to the produce 

 of clover, turnips, or grass, which the field can give 

 when unmanured. 



The Saxon experiments show that this inference 

 cannot be far from the truth, in one respect at least ; 

 for on comparing the produce of clover given by the 

 unmanured plots with the quantity of farm-yard 

 manure applied, we find : 



Clover crops in 1854. 



Cunnersdorf. Mausegast. KStitz. Oberbobritzsch. Oberschona. 

 Pounds.. 9144 6583 1095 911 



Quantity of manure applied in 1851. 

 Cwt 180 194 229 314 897 



The field at Cunnersdorf which contained the largest 

 store of dung-constituents received the smallest; the 

 field at Oberbobritzsch which gave the smallest crop 

 of clover, the largest quantity of farm-yard manure. 



The crop of clover, however, is not the only factor 

 to determine the amount of farm-yard dung required 

 for manuring ; for one of the clover-constituents, silicic 

 acid, which is indispensable to the cereal plants, is 

 present only in trifling proportion, and hence the quan- 

 tity of farm-yard manure (straw-manure) must bear a 

 definite ratio to the quantity of straw-constituents 

 already present in the ground. 



If, in the Saxon experiments, we compare the in- 

 creased produce of corn and straw obtained from the 

 fields manured with farm-yard dung, we find : 



Increase of produce by farm-yard manuring, per acre. 



Cunnersdorf. Kotitz. Oberbobritzsch. 



Quantity of farm-yard manure 180 cwt. 229 cwt. 314 cwt. 



Corn 347 Ibs. 352 Ibs. 452 Ibs. 



Straw : . 1743 u 1006 " 914 " 



The field in Cunnersdorf, manifestly the richest in 

 substances nutritive for straw, gave the largest straw- 



