Mineral Ingredients of Wheat, Barley, and Hay. 143 



the total produce of wheat or barley. Of potash, the assumed 

 average hay crop will remove five or six times as much as the 

 grain of either the wheat or the barley, and nearly twice as much 

 as the total produce, grain and straw together. Of lime, soda, 

 sulphuric acid, chlorine, and silica, the hay will remove many 

 times more, and of magnesia much more, than either 

 the wheat or the barley grain. Of lime, soda, sulphuric 

 acid, and chlorine, the hay will also remove much more, 

 and of magnesia more, than both grain and straw 

 together. Of phosphoric acid and silica alone will the total 

 produce of the corn crops remove more than the hay crops. 

 Summing up the salient points, it is obvious that in 

 Rothamsted Park, where the soil is a loam with a clay subsoil, 

 the effect of the application of a complex fertiliser like 

 farmyard manure, supplying as it doubtless does much more 

 of all the mineral constituents than the crop takes up, is in a 

 striking degree to increase the assimilation of potash 

 notably also that of phosphoric acid, and to some degree^ that 

 of silica ; much more chlorine is also taken up. Indeed, 

 it will subsequently appear that the supply by manure of 

 potash has a more marked effect on the quantity, and on the 

 botanical and chemical character, of the herbage of the hay 

 crop, than that of any other of the mineral or ash con- 

 stituents. 



RESULTS OBTAINED UPON THE VARIOUSLY 

 MANURED PLOTS OF MEADOW LAND. 



By dressing the several experimental plots of permanent 

 grass land with different manures, and with different 

 mixtures of manures, variations are induced in the character 

 of the resultant herbage, the visible effect of which in the 

 middle of summer may fairly be described as kaleidoscopic. 

 To the practical man the nature and extent of these 

 variations, as revealed by the gross test of the weighing 



