For the purpose of quantitatively distinguishing the influences of temperature (
t), humidity (
h), leaf position in a tobacco stalk (
p) and direction in a leaf, upon the tensile characteristics or equilibrium moisture content of tobacco (
Y), statistical calculations were carried out with many data on typical varieties in Japan, that is, Flue-cured (
v1) and Domestic variety (
v2). And the following formula to estimate
Y was analyzed (Table III).
Y=C
0+C
1t+C
2h+C
3h
2+C
4p+C
5p
2After that, the relation between tensile characteristics and equilibrium moisture content (
w) was searched with the formula
Y.
The important results obtained were as follows:
(1) Tensile strength (
Pm)
The
Pm of
v1 was greater than that of
v2. The
Pm of
v1 was decreased when the
h(w) or
t was increased, but the
Pm of
v2 did not show any notable tendency with the
h (w) or
t. In every variety the
Pm was decreased toward the lower position in a stalk (Fig. 3 and 4).
(2) Elongation percentage (ε)
The ε of
v1 was higher than that of
v2. In every variety the ε was increased when the
h (w) or
t was increased, and toward the upper position in a stalk (Fig. 3 and 4).
(3) Elastic modulus (
E) and Elasticity per unit dry weight (
EG)
The
E of
v1 was smaller than that of
v2. In every variety the
E was decreased when the
h (w) or
t was increased. In the variety
v1 the
E became minimum at the upper or middle position of a stalk, and was increased toward the lower position. This tendency was shown in the variety
v2 too, but the degree of change with the stalk position in the
v2 was smaller than that in the
v1. The appearance of the change in the
EG was very similar to the above-mentioned results in the
E (Fig. 5 and 6).
(4) The influence of
w on tensile characteristics (
Pm, ε,
E or
EG) was very much greater than that of
t (Fig. 4 and 6).
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