EXPERIMENTS OX THE MIXED HERBAGE OF PERMANENT MEADOW. 297 
Plot 10.—Sulphates of potass, soda, and magnesia, and superphosphate of lime (as 
plots 7 and 8), and ammonia-salts, 6 years, 1856-61 ; sulphates of soda and 
magnesia (without potass) and superphosphate of lime (as plot 8), and 
ammonia-salts, 1862, and each year since ; also sawdust the first 7 years, but 
without effect. 
Plot 11—1.—Sulphates of potass, soda, and magnesia, and superphosphate of lime 
(as plots 7 and 9), every year ; twice as much ammonia-salts as plot 9, 3 years, 
1856-58 ; same ammonia-salts as plot 9, 3 years, 1859-61 ; double quantity 
again, 1862, and each year since. 
Plot 11-2.—The same as plot 11-1, with the addition of a mixture of silicate of 
lime and silicate of soda, 9 years, 1862-1870, and of silicate of soda only, 
1871, and each year since. 
Plot 12.—Unmanured, every year, 1856, and since. 
Plot 13.—Sulphates of potass, soda, and magnesia, superphosphate of lime, and 
ammonia-salts (as plot 9), and cut wheat straw, every year. 
Plot 14.—Sulphates of potass, soda, and magnesia, and superphosphate of lime (as 
plots 7, 9, 11, and 13), and nitrate of soda containing nitrogen equal that in 
the ammonia-salts of plots 5, 9, and 13, 1858 and each year since. 
Plot 15.—Nitrate of soda alone, same quantity at plot 14, 18 years, 1858-75 ; no 
nitrate, but sulphates of potass, soda, and magnesia, and superphosphate of 
lime (as plots 7, 9, 11, 13, and 14), 1876, and each year since. 
Plot 16.—Sulphates of potass, soda, and magnesia, and superphosphate of lime (as 
plots 7, 9, 11, 13, and 14), and half as much nitrate of soda as plot 14, 1858, 
and each year since. 
Plot 17.—Nitrate of soda alone, same quantity as plot 16, 1858, and each year since. 
Plot 18.—Mixture containing the potass, soda, lime, magnesia, phosphoric acid, 
silica, and nitrogen, of 1 ton of hay, also sulphuric acid and chlorine, 1865, 
and each year since. 
Plot 19.—Nitrate of soda (same quantity as plots 16 and 17), sulphate of potass, 
containing the same quantity of potass as the nitrate of potass of plot 20, and 
superphosphate of lime, 1872, and each year since. 
Plot 20.—Nitrate of potass, containing the same quantity of nitrogen, and the 
same quantity of potass, as the nitrate of soda aud sulphate of potass of 
plot 19, and superphosphate of lime, 1872, and each year since. 
It will, perhaps, conduce to clearness of conception of the characteristic actions of the 
different descriptions of manure, if the results obtained are, in the first instance, 
discussed as far as possible without reference to the influence of the various seasons. 
Accordingly, it is proposed to consider the average amounts of produce yielded by 
characteristically different descriptions of manure, over the first 10, the second 10, and 
the total period of 20 years, of the continuous application to the same plot ; and, in the 
special cases in which the manure employed has been changed during the course of the 
MDCCCLXXX. 2 Q 
