Volume 11 Part 1 Article 33: Factors in Bulk Pasteurization and Spawn-Running

Volume 11 Part 1 Article 33
Year 1981
Title: Factors in Bulk Pasteurization and Spawn-Running
Author: J.P.G. Gerrits


About 1970 bulk pasteurization was started in practice in several places. Sometimes spawn-running was carried out in bulk as well. Considerable interest also arose in this process in the Netherlands. Because insufficient data were available concerning the requirements of this process, research was started in the Netherlands. For this purpose an experimental tunnel was completed in 1974. It was 6 m long and 1.5 m wide containing about 8 tons of compost. This tunnel was used to check whether pasteurization and spawn-running in bulk would give the same results as the conventional process in trays or shelves. Trials were carried out, 54 in total. The results of these trials have been published (6/ 7, 8, 10). The main conclusion was that the results in bulk were comparable or even better than those obtained in a mushroom house. Much has been written about the process but hardly any research has been done (3, 12).

Meanwhile the use of full-grown compost increased quickly. In 1980 almost half of the mushroom production in the Netherlands originated from full-grown compost. Therefore there was a need for more detailed and comparative studies to determine the optimum of various factors and their interaction. This became possible in four experimental tunnels that were commissioned in February 1979. The working-method in these tunnels has already been described (11). The first factors that were studied were the duration of peak-heating, the required quantity of air for circulation and the temperature during conditioning. The relevant findings will be described in this paper.

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