210 On Permanent and Temporary Meadows and Pastures. 
this restitution will be a mixture of salts which contain these 
elements in the most convenient form. 
Since there is in one ton of dry hay on an average — 
lbs. Or in 1000 lbs. 
Phosphoric acid .. .. 16-14 7-12 
Potash 52-88 23-61 
Magnesia 6-18 2-76 
Lime 32-61 14-56 
it will be well in the majority of cases to dress the soil with 
a manure of similar composition. It is easy to combine a 
manure containing in every 100 parts — 
Assimilable phosphoric acid S'O 
Non-assimilable do. do 1*5 
Potash 14-0 
Lime 20-0 
Magnesia 2-0 
at the rate of 5s. 7f c?. per cwt., including sacks, or say 6^. Id. per 
cwt. delivered at the farm, making an allowance of an average 
freight of hd. per cwt. 
336 lbs. of this manure compensates, more or less exactly, for 
the loss sustained by the soil in producing 1 ton of hay. Sup- 
posing that an entire restitution of the mineral elements is 
necessary, an expense of 18s. 2>d. per ton of hay produced will 
be incurred. 
But we have seen that it is useful to add a little nitrogen to 
the manure for grass-land. If we use nitrate of soda we may 
fix the beneficial amount at 138-8 lbs. per acre, supplying 20-51 
lbs. of nitrogen ; say about 6-72 lbs. of nitrogen, or about 
44-8 lbs. of nitrate of soda, per ton of hay produced. 
We could introduce this quantity of nitrate of soda into the 
manure, by reducing the proportion of lime, which is really 
in excess of the actual requirements. We should thus get a 
In 100 parts. 
In 336 lbs. j 
Assimilable phosphoric acid . . 
Non-assimilable do. do. 
Nitrogen assimiliibb^ 
Lime 
5-00 
1- 50 
14- 00 
2- 00 
2-00 
15- 00 
IG-SO 
504 
47-37 
705 
7 05 
50-40 . 
This manure is worth 8s. l^d. per cwt., packed in bags, or 
say about 8s. 6]^f/. per cwt. delivered at the farm. The amount 
of 336 lbs. being necessary to produce one ton of hay, would 
