The Raisin Industry: A practical treatise on the raisin grapes, their history, culture and curingEisen, Gustavus A.
History
The Raisin Industry: A practical treatise on the raisin grapes, their history, culture and curing
Eisen, Gustavus A.
Raisins; Viticulture -- California
_The Influence of Irrigation on the Soil._--It is by many considered
that irrigation helps to fertilize the soil. The spring and flood water
contain great quantities of mud and humus, which when spread over the
land will greatly increase its fertility. Even ordinary river water
contains salts and other ingredients, which will fertilize the soil to
no small degree. Another cause of the increased fertility of
subirrigated soils is that the water which constantly evaporates carries
with it salts, etc., from the lower strata up towards the surface, and
makes them accessible to the roots of the vines. But, on the other hand,
if the water or the soils contain alkalies or other destructive
substances, these also are deposited on the surface to the great
detriment of the vines, and often to such an extent that the vines will
die or become sickly. Too abundant flooding may also leach out of the
soil its soluble salts, and carry them deeper down in the ground. But if
this soil after a while fills up with water and becomes subirrigated,
the evaporation of water from the surface will gradually carry these
salts back to the surface, when they will increase the fertility of the
soil. Where drainage is very perfect, constant irrigation will gradually
rob the soil of many of its soluble salts, and carry them to places
where they will forever be out of the reach of the vines. To ascertain
these facts and conditions, every vineyardist should have the soil
analyzed about every five years, and too great care cannot be taken to
keep the soil of proper strength.
Another influence of irrigation on the soil may also be mentioned here.
Some of the soils in the irrigated districts which were formerly very
hard and difficult to work have in course of time changed and become
mellow. The water has undoubtedly caused a chemical and mechanical
decomposition of the components of the soil, which has caused it to
continually improve. Even certain kinds of hardpan have been known to
dissolve when irrigated, and to change into useful and mellow soil, in
which the vines can find nutriment. Such hardpans are those which are
generally found in very dark red soils; those in lighter soils are not
so readily dissolved.
THE RAISIN GRAPES.
_Introductory Notes._--The raisin grapes might be divided into two
classes,--proper and genuine, such as Muscats, Sultanas and Currants,
and irregular or inferior raisin grapes, such as Malagas and Feher
Szagos. Now-a-days almost any kind of grapes are dried and sometimes
called raisins, but the proper name for them should be dried grapes.
With these we need not here busy ourselves, as with a few exceptions
they are of little value, and cannot be compared with the regular raisin
grapes, either as regards quality, demand or price.
Public-domain text, read in full here on John Shaqi.
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