MANURING COFFEE. 189% 
amount of mineral matter taken from an acre of land 
will be about 28 1b., of which 15 lb. will be potash. 
Compared with most of our cultivated crops, this 
amount of potash is but small, and I should he dis- 
posed to think that a soil exhausted by coffee grow- 
ing ora soil not sufficiently rich to grow coffee with- 
out manure would not be much benefited by the 
application of potash salts. Judging from the character 
of the plant and from the large amount of wash- 
ing which the soilit grows in is exposed to, I should 
consider that the most suitable manures to use would 
be those which contain organic nitrogen, rather than 
such manures as nitrate of soda, or sulphate of ammo- 
nia. Rape or poonac cake, dried flesh [? fish.—Ep.C.O.], 
shoddy mixed with finely ground bone, would accord 
with my ideas of a good coffee manure; some of 
these would supply potash in sufficient quantities. 
In bones and shoddy, where it is almost absent, 
perhaps a little potash would be useful. Manures 
made by feeding stock would be undoubtedly valuable, 
but this sort of manure is by no means economical 
unless the animal fed increases in value. To employ 
animals merely to turn food into manures cannot be 
recommended, and it is probable that, of the two, 
artificial compounds would prove the cheapes. Judg- 
ing from the analyses of coffee soils which I have 
‘seen, potash appears to be present in considerable 
quantities, and I should be disposed to rely upon the 
soil to supply this substance together with the small 
amount which the manures I have recommended the 
use of would contain, and not to expend money in 
the purchase of salts of potash, 
_ (Signed) J. B. Lawes, 
August 1879. Rothamsted, 
= 
ARTIFICIAL MANURES VERSUS 
CATTLE MANURE: 
KEEPING CATTLE FOR MANURING ALONE ABSOLUTELY 
UNPROFITABLE. 
THE POSITIVE NEED FOR AKTIFICIAL EXTRANEOUS 
MANURES. 
THE ELEMENTS TO BE SUPPLIED TO SOIL AND THE 
BEST MIXTURES. 
The great prophet of the new system of agriculture.’ 
which dispenses with the rotation system, with the 
setting aside of from 50 to 70 per cent of a farm for 
grazing purposes, and also with farm-yard manures, 
if M. Georges Ville, a Frenchman, whose work, traus- 
