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Abstract: Three medium-sized commercial Agaricus bisporus strains, two pure white and one white, registered in our laboratory with the code numbers 205, 206 and 207 respectively, were firstly evaluated for their quantitative (biological efficiency, carpophore number) and qualitative (average weight, pileus diameter, stipe length and color) production characters. Although the biological efficiency (BE%) of the three strains was high, best yields were noted for strains 207 and 206, whereas harvested mushrooms of the former strain presented the lowest average weight. Between the pure white strains 205 and 206, no difference was detected in carpophore average weight (small and large), as well as in their productivity in the second and third flushes. In a subsequent experiment, the influence of calcium chloride irrigation on yield and mushroom quality of selected strains 206 and 207 was investigated. The strains were subjected to six watering treatments: tap water (control) and 0.05, 0.10, 0.15, 0.20 and 0.25% of calcium chloride dilutions. Preliminary results from these studies, still in progress, demonstrated that, there was no significant effect of calcium on these particular strains' yield and average weight. Concerning mushroom color and texture, an improvement was detected in the white strain, in concentrations of calcium chloride higher than 0.15%.
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