Volume 4 Part 1 Article 32: Influence of Storage at the Temperature of 2°C below Zero on Productivity of the Spawn (Manure Spawn)

Volume 4 Part 1 Article 32
Year 1960
Title: Influence of Storage at the Temperature of 2°C below Zero on Productivity of the Spawn (Manure Spawn)
Author: I. Heltay with the cooperation of J. Barber


It is a widespread practice among spawn makers to store the spawn after termination of the incubation, in sterile condition for a more or less prolonged period at a temperature around 2°C below zero.

Some workers attribute a positive biological effect to such a storage, while others consider it a necessary evil, which may be justified only from a business organization- or commercial point of view, to satisfy the fluctuating demand for spawn.

During the years 1955-58, Heltay cooperated in the organization of mushroom growing and spawn making, in the planning and equipping of laboratories in several friendly countries. In the course of his work he had to solve some problems of organization which made it necessary to determine in which direction and to what extent the productivity of the manure spawn is influenced by the duration of its storage at the temperature of 2°C below zero.

In the cropping experiment No. 280 reported here and conducted in 1958 after several preliminary investigations, a comparison was made between the productivity of manure spawn not stored on refrigerator (A) and that of spawn stored in an automatically controlled refrigerating chamber at —2°C for 68 days (B), 128 days (C) and 202 days (D). On the grounds of earlier investigations it was expected that the difference between the productivity of the single treatments (A-D) would amount to only a few per cent; we endeavoured therefore to arrange the experimental conditions with such a high degree of precision which is possible when growing in cellars.

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