The Mount Holly news. [volume] (Mount Holly, Burlington Co., N.J.) 1891-1942, 1909-01-19
Home Course In
Modern Agriculture
U-HoW Plants Eat and Grow
By c. v. GREGORY.
Africuffurof Divfsfon. STATE CoUeSe
Nv C. ". GREGOR'
A&ricuffurof DfVfsfon. IosOa Sfofe congo
Copyright. American Press Association

to do we'll This is because 1t cannot
get as much of the mineral elements
as it needs.
Too much nitrogen in proportion to
the amount of mineral elements causes
the plant to ego all to vines" There
will be an excessive growth of leaves,
but the yield of grain will be small.
Take an ear of corn or bunch of hay
and burn it. The ashes that are left
are the mineral parts of the plant.
These cannot be obtained from air or
water, but must come from the soil.
Some Of the most important of these
are iron, which is the substance that
helps to build up chlorophyll, and sui
phur, which is found in the nitroge-
nous parts of the plant. There are a
number of others also. all of which
are present in the sell in such large
amounts that there ill probably al
ways be all that tie crops can use.
Two of these minerals, however, po-
tassium and phosphorus, are not so
plentiful. When the plant cannot get
enough potassium the grain will not
be filed out well. II there is too little
phosphorus. especially in the case Of
fruit trees, the development of fruit
is checked. Adding barnyard manure
to the sell helps to keep up the supply
of these two materials On farms
where little stock is kept or where
grain has been raised continually for
years and little attention paid to the
soil it is sometimes necessary to apply
phosphorus and potassium in the form
of commercial fertilizers.
In the eastern part of this country
there are many farms that have be-
come so badly run down that crops
will not grow at all unless they are
fed with commercial fertilizers. These
are very expensive. and it often takes
nearly all farmer makes to pay his
fertilizer bills These farms would
never have become so worn out If they
had been properly cared for. Leaving
plowed ground, especially on hillsides,
exposed for several months during the
fall and winter allows much plant food
to wash away. Growing the same
crop year after year wears out the
land rapidly Different crops require
different kinds of food. BY changing
crops from year to year no one food
material is used to excess and the
others wasted. BY keeping as much
stock on the farm as possible, saving
the manure carefully and spreading it
on the fields before it rots or teaches
away and by using leguminous plants
to gather nitrogen the soil can be kept
well supplied with plant food.
1t is much more profitable to feed
the crops in this way than to buy
plant food on the market at excessive
prices. Usually, however. the plant is
because they are not in the soil, but
because they are in form in which
it cannot get at them. The roots Of
the plant spread all through the soil
In search of food If you will look at
a little root through a magnifying
glass you will see that it is covered
with root hairs 1t is through these
root hairs that the plant takes up food
from the soil There are no openings
directly into them. but the walls are
so thin that the water can soak
through to the inside. Solid sub
stances, of course. cannot get in, so
that the plant food must be dissolved
In water before 1t can get into the
roots and so up to the chlorophyll,
which is waiting to build 1t into seeds
or leaves.
If the soil has been worked until 1t
Is fine and loose each little particle