816 



THE COMPLETE GRAZIER. 



Details as to the nature and amount of the yield under each condi- 

 tion of manuring will be found in a separate volume upon the 

 Rothamsted Experiments. 1 We cannot do more here than introduce 

 the following table showing the average amount of nitrogen, and of 

 most of the mineral constituents, removed in one acre each of fail- 

 crops of wheat, barley, and meadow hay. For this purpose the follow- 

 ing yields per acre are assumed : 



Wheat, 30 bushels=l,8001b., and 3,0001b. straw=4,8001b. total 

 produce. 



Barley, 40 bushels = 2,080 lb., and 2,500 Ib. straw =4, 580 Ib. total 

 produce. 



Meadow hay 1| tons, or 3,360 lb. Meadow hay varies so greatly in its 

 botanical and chemical composition, according to soil, climate, and 

 manuring, that it is necessary to take mean results : 



Per Acre. 

 COMPOSITION OF AVERAGE CROPS OF WHEAT, BARLEY, AND MEADOW HAT. 



These figures, read from left to right, will be found most instruc- 

 tive. Assuming as the basis of comparison the mean composition of 

 the manured and the unmanured hay, it is seen that a fairly good 

 crop of hay will remove about one-third more nitrogen than the grain 

 of a fairly good crop of wheat or barley, and practically the same 

 amount as the total produce, grain and straw together, of either of the 

 corn crops. Of phosphoric acid, the hay crop will remove somewhat 

 less than the grain alone, and only about two-thirds as much as the 

 total produce of wheat or baiie}'. Of potash, the assumed average hay 

 crop will remove five or six times as much as the grain of either the 

 wheat or barley, and nearly twice as much as the total produce, grain 

 and straw together. Of lime, soda, sulphuric acid, chlorine, and silica, 



1 "The Rothamsted Experiments on the Growth of Wheat, Barley, and the Mixed 

 Herbage of Grass Land." By W. Fream : Published by Horace C<\x, "The Field" Office, 

 Bream's Buildings, Chancery Lane, London, E.G. 5s. 6d. 



