Volume 13 Part 2 Article 36: Factors Affecting Colour of Cultivated Mushrooms (Agaricus bisporus) Prior to Harvest and during Postharvest Storage

Volume 13 Part 2 Article 36
Year 1991
Title: Factors Affecting Colour of Cultivated Mushrooms (Agaricus bisporus) Prior to Harvest and during Postharvest Storage
Authors: C.E. Bartley, R.B. Beelman and J.R. Winnett

Abstract:

Studies were conducted to determine the effects of production room air flow rate, age of crop, and irrigation water treatment on the colour or whiteness of off white hybrid mushrooms. Data collected from twelve different mushroom crops grown at the Mushroom Test Demonstration Facility (MTDF) revealed that mushrooms subjected to high air flow rates in the production room were significantly darker prior to harvest than mushrooms exposed to low air flow rates. In addition, mushrooms from the second and third successive flushes of the cropping cycle were found to be progressively darker prior to harvest and browned at a faster rate during postharvest storage at 12°C. Experiments conducted at the Mushroom Research Center (MRC), have shown that a combination of calcium chloride (0 25%) and 50 ppm stabilized chlorine dioxide (Oxine) added to irrigation water significantly improved shelf life of off white hybrid mushrooms but had no effect on colour prior to harvest and resulted in a yield reduction. However, a combination of 50 ppm Oxine and 0 075% calcium chloride added to the irrigation water of an off white hybrid crop at the MTDF, where yields of mushrooms are significantly higher than at the MRC, resulted in both a significant improvement of mushroom colour prior to harvest and a significant decrease in browmng rate during postharvest storage. Yield was not reduced by use of irrigation water treatment at the MTDF.

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