60 
of that given on Plot 4, but the potash was half as much again. 
This would be given by the following mixture :— 
74 ewt. dried blood a .. £1 2 0 
1} ewt. cont. superphosphate . O16 8 
24 cwt. potash salt =e se 11h 6 
£3 13 2 
Freight and cost of application -- 0 610 
Total cost of manure . £4 0 0 
1,300 Ibs. increased yield of raspberries, 
at 2id. ae iis --- £13 10 10 
Cost of manure ... age . 4 0 0 
Increased profit per acre -- £9 10 10 
If the nitrogen were supplied by green manuring with peas, 
the results would doubtless be still better. 
I am unfortunately unable to quote more instances from my 
experiments in fruit manuring. But I have dozens of similar 
returns from my experiments with cereals, hay, peas, beans, roots, 
and potatoes; and there is no question about manuring being 
profitable when carried out in a business-like way. Indeed it is 
as I have already said, that, except in a few fortunate cases of 
naturally rich soils, agriculture cannot be carried on as a highly 
profitable business except with the liberal use of plant foods. 
There is only one further matter remaining to be considered, and 
that is in regard to the mode of applying the manures to the soil. 
In manuring fruit trees it is advisable that the manures should 
get down to a considerable depth. To this end the solubility of 
the manures must be considered. The most soluble manures 
are the nitrogen salts—sulphate of ammonia and nitrate of soda 
—the potash salts, and the superphosphates. Next to these come 
dried blood and dried night-soil. Farm-yard manure is partly 
soluble and partly insoluble; some of the insoluble gets very 
slowly converted into the soluble kind, but a portion of it 
becomes finally so fixed as to be of little use to plants. Bone 
meal is readily made use of by plants having roots near the 
