The aim of this study was to analyze yields, biological efficiency, earliness (expressed as
days to first harvest), and precociousness and establish models for the mushroom growing according
to these parameters. The experiment followed a double factorial design with four sources of calcium
(calcitic limestone, calcitic limestone + gypsum, dolomitic limestone and dolomitic limestone +
gypsum) and 2 application times (25 days before casing and at the moment of casing), with 4 replicates
for each treatment. Different calcium sources influenced differently Agaricus subrufescens
production, especially as regards earliness, which showed significantly higher values when dolomitic