אסיף מאגר המחקר החקלאי

The temperature effect on fumigant desorption from cereal grain

Year:

1975

Source of publication :

Authors :

Volume :

23

Co-Authors:

Bielorai, R., Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Alumot, E., Agricultural Research Organization, Volcani Center, Bet Dagan, Israel

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Abstract:

The more rapid desorption of fumigant residues from whole cereal grain at low (14-17°) rather than at high (30-37°) temperature was confirmed with several fumigants by two methods of analysis. The unchanged fumigant residues seem to be present in the fumigated grain in two forms: loosely and firmly bound. The desorption of the firmly bound residues from grain fumigated at room temperature is at least twice as fast at low rather than at high temperature of airing. Fumi-gatioa temperatures affect the relative amounts of the residues: at lower temperatures lower levels of firmly bound residues are present. This temperature effect may be responsible for faster desorption in winter than in summer as noted in field experiments. The low-temperature effect was abolished by grinding the grain and was not due to the fat fraction of the fumigated materials. It seems that the intact grain structure is responsible for this effect.

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