Abstract
In a proceeding paper pyroelecttic behavior has been demonstrated to exist in the external tissues of grain (e.g. of wheat). In the present paper the temperature dependence of the pyroelectric coefficient is studied in three varieties of winter wheat of different degrees of hardiness, two varieties of spring wheat and, for comparison, winter rye and spring rye. The diagrams of the pyroelectric coefficient vs. temperature of the winter wheat varieties had, without exception, a characteristic maximum-peak below the freezing point (between -10°C and -6°C) corresponding with their degree of winter hardiness. Peak readings of the cooling maxima of 3.5 to 4.6 × 10-10 Coul/cm °C were recorded, such readings laying higher than the coefficient p of tourmaline. In the cooling-heating cycle all winter wheat samples showed a characteristic temperature hysteresis.Spring wheat showed a pyroelectric behavior fundamentally different from that of winter wheat. From a maximum at +20°C the readings dropped steadily (without...
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