HINTS ON SOILS AND FERTILIZERS 49 
first two are the forms most commonly used. 
Ground limestone is a reliable form of lime to 
use, although not quite as quick in its response, 
as the burnt lime. In many communities there 
are large deposits of lime rock that are capable 
of being crushed and ground finely enough for 
agricultural purposes. When this can be se¬ 
cured, it will probably be the cheapest source 
available, unless the distance of hauling is too 
great. A farmer might plan to haul this lime 
during the summer or fall, but as he generally 
will not have the time for such extra work, he 
may safely leave it for the more leisure winter 
days, without a serious loss of results. 
Another form of agricultural lime is lump, 
or burnt lime, already mentioned. This is made 
by heating the limestone to an intense heat, 
in specially constructed kilns, thus driving off 
the impurities, and leaving the common lump 
lime. When this lime in the lump form is 
finely ground, it is ready to put on the land. 
There are many companies that make a busi¬ 
ness of preparing this lime, and selling it in 
carload lots to groups of farmers. 
In regard to the time of applying the lime 
on the land, it might be said that the sooner 
it is applied, the better. If it can be put on 
during the fall, after a crop has been har¬ 
vested, and allowed to stay in the soil over 
winter, much better results will be obtained 
than putting it on the land just before the crop 
is put in, in the spring. Whenever lime is put 
on, fall or spring, it should be thoroughly 
worked into the soil, rather than allowed to 
remain on top. 
