文档介绍：Dry matter
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104 TECHNOLOGY OF CEREALS
are shown in Fig. , should be borne in mind 35'
throughout. H [\
r
0E
Moisture content and storage 30'
5
temperature c7'e
Moisture content is expressed as a percentage
of the grains' wet weight. The safe moisture
contents for storage vary according to the type of
cereal but it is widely assumed that they are
equivalent to the equilibrium moisture content
of the respective grains at 75% RH and 25°C
(Table ).
50 io0 I50
?d
Equtlibnum Moisture Contents of Grains at 75% RH and 25°C F~~ potential storage the(number of days) of wheat
grain as a function of temperature ("C) and moisture content
Cereal Type Moisture ?LO ("h), the germination rate maintained being 70%. From
Barley (250-280c) Guilbot, (1963) Producteur Agncole Francats, Suppl. mai
Maize ITCF, Paris.
Oats
Rice 40'
Rye (25"-28"C)
Sorghum
(u) h
Wheat e
durum 30"
(u) ??
red +3
white (rt) s
(rt) g
200
Based on values in Bushuk and Lee, 1978. i
I
G 100
In temperate regions the moisture contents at u?!
which grain is stored are closer to those described
as wet rather than dry. The significance of 0"
moisture contents cannot be considered alone as 5 io 15 20 25
the deleterious effects of excessive dampness are 0 Moisture content %
affected critically by ambient temperature and Good conservation
position of the surrounding atmosphere. HInsects
The increase in relative humidity of the interseed m
atmosphere with temperature, is slight. It amounts nGermination
to about -% moisture increase for each Moulds
10°C drop in temperature.
Risks to which stored cereal grain is exposed as a
The relationship between moisture content and function of grain temperature in "C and moisture content in
temperature as they affect storage of wheat is %. From Burges,