22 JOHNSON & STOKES 
of acid phosphate. Either of these articles, if bought from 
a reliable dealer, is a good and economical thing to use. 
Potash is to be had most cheaply, perhaps, in the manner 
suggested heretofore: by the use of kainit as a preserver of 
stable manure. The kainit performs a double purpose if 
used in that way, and thus gets upon the land in a cheap 
manner. 
Muriate of potash and sulphate of potash are high- 
priced articles, but when bought from good houses are fully 
worth the money they cost. Except for the use of kainit, just 
mentioned, the muriate or sulphate would be the more eco- 
nomical form. 
Potash or phosphoric acid (or both), as may be deter- 
mined by circumstances, are needed to aid crimson clover in 
its growth, and with the clover form a perfect manure. 
Barnyard manure is a perfect fertilizer, especially when 
preserved with kainit or acid phosphate; and a leguminous 
crop, if stimulated with phosphoric acid and potash, leaves 
the land in fine cropping condition. 
Value of Green Manures. — The cash value of green 
manuring is somewhat a matter of location. On light, sandy 
soils it will be found wise to turn the whole crop under 
with the plow, while on heavy loams this plan is of doubtful 
benefit. On the latter land it is conceded to be better prac- 
tice to harvest the crop and feed it to stock, and return the 
resulting manure to the land. 
Maximum Amounts of Manures Nobody has yet 
ventured to fix the maximum amounts of natural or artificial 
manures that soils will bear, but these amounts are great. 
Reference has already been made to the number of tons of 
stable manure per acre used respectively by market gardeners 
and farmers in America. As to commercial fertilizers, the 
quantity has been pushed up to two tons per acre, with 
enormous crops in consequence, and with no bad results 
