152 INFLUENCE OF MANURES ON GRASS LAND. 

with nitrate of soda, and, as a consequence, the former manure 
is especially adapted to stimulate and encourage the growth 
of a shallow-rooted plant like Agrostis. 
The Influence on Agrostis of Superphosphate when used alone 
(compare Plots 1 and 3, Table I.)—At tliree of the four stations 
Agrostis has been increased. At Glasson, where this manure 
doubled the crop of hay, it more than doubled the weight of 
Agrostis. , 
The Influence on Agrostis of Superphosphate when added to 
Nitrate of Soda (Compare Plots 2 and 6, Table I.).—Here the 
percentage of Agrostis has been reduced at three of the four 
stations, but, in spite of this, the actual weight of Agrostis 
produced has, on three ocasions, been greater where super. 
was applied. 
The Influence on Agrostis of Superphosphate when added to 
Kainit (compare Piots 5 and 8, Table I.)—The tendency has 
here been in the direction of reduction of Agrostis. Only on one 
occasion has super. produced an increase. 
The Influence on Agrostis of Superphosphate when added to 
both Nitrate of Soda and Katnit (compare Plots 7 and 9g, 
Table I.).—With the exception of Eskdale, the super., when 
used as above, has effected a marked reduction in the 
amount of Agrostis. 
The rnfiuence on Agrostis of a double and triple dose of Super- 
phosphate (compare Plots 2, 3, and 4, Table IL.)—At each of 
the three stations, where Agrostis was fairly abundant, the 
double dressing of super. invariably diminished the percentage 
yield of this grass, while the triple dressing hada similar 
effect in two cases out of three. 
Summary of the results ow Agrostis obtained with Super- 
phosphate. -— Ten times in sixteen the super. has either 
diminished, or at least failed to increase, the percentage of 
Agrostis, and the tendency, where increasing quantities of this 
manure have been used, has been strongly in the direction of 
suppressing the growth of this plant. 
The influence on Agrostis of Superphosphate tn comparison 
wth Basic Slag. —This was tested twice at each of the 
stations of Set 1, and once at each of the stations of Set 2. 
In every case the comparison was between equal amounts of 
phosphoric acid. 
