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
_Slanting the Trays._--The practice of raising one end of the tray
higher than the other is of very questionable value. In the fore part of
the drying season, the heat from the sun is such that the raisins
receive all the heat they require without being raised at an angle
against the sun. Towards the end of the season, I have found that, when
the trays have been raised, those grapes which lie on the lower edge of
the tray, and accordingly nearest to the ground, dry the quickest, while
those at the upper edge dry considerably slower. The cause is that the
air a foot above the ground is much cooler than close to the ground; the
large space under the raised tray also serves as a cooling room to cool
the tray. In some direct experiments made, it was found that, as regards
the tail end of the first crop, the raised trays came in several days
later than the trays which had remained flat on the ground. In
advocating that the trays should not be tilted, I must not be understood
to mean that it is not beneficial to keep the tray in a tilted position
when there is a close background to sufficiently heat the air equally at
the upper and lower end of the trays. This can only be secured by either
placing the trays against the side of a hill or on specially prepared
drying floors, which are described further on. In this connection I may
suggest that when the heat of the sun is not great, and when the raisins
dry slowly, the placing of an empty tray behind the drying tray, in
order to reflect the sun on the raisins, will considerably hasten their
drying. This is a valuable aid in drying, especially when the second
crop is late.
_Elevating the Trays._--The practice of elevating the trays containing
the tail end of the second crop is a good one. The best way is to place
the trays on the top of the vines, when it will be found that the free
circulation of air underneath will help to dry the raisins and prevent
rot and mold. This method is only adopted after fall rains, but is then
of great help in drying the crop.
_Stacking Against Rain and Dew._--The stacking of the trays is also a
valuable help in keeping out dew and cold. Late in the season, when it
takes several hours of sunlight to dry the night dews, the stacked trays
will be dry when the first rays of the sun are out. When heavy rains are
expected, the grapes, whether partially dried or not, should always be
stacked. It will keep the stems from rotting off from the berries, and
will generally save the crop from being seriously injured. Some growers
have an idea that only the partially dried grapes should be stacked, but
the green ones are equally benefited.
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