IMPACT OF THE MICROELEMENTS SUPPLEMENTED IN THE CASING LAYER ON THE CHEMICAL CONSTITUENTS OF THE EDIBLE MUSHROOM AGARICUS BISPORUS

Abstract

The experiment was conducted at the mushroom farm in the College of Agriculture, University of Tikrit. Four microelements, namely iron, zinc, manganese, and molybdenum, were tested in three concentrations of 50, 100, and 200 mg L-1 , in addition to a control treatment. All of these were added to the casing soil of the edible mushroom Agaricus bisporus. The results indicated that the Mo100 (molybdenum at 100 mg L-1 ) treatment yielded the highest protein and ash contents in the mushroom fruit bodies, reaching 28.31% and 13.23%, respectively, with an increase percentage over the control treatment of 26.60% and 14.29% for protein and ash, respectively. The Mn50 (manganese at 50 mg L-1 ) and control treatments superior on other treatments in the total carbohydrate content of the mushroom fruit bodies, with percentages of 66.29% and 65.38%, respectively. The Mix100 (microelements mixture at 100 mg L -1 ) treatment recorded the highest dry matter content, with a 21.94% increase over the control treatment. As for total fat content, the Mn100 and Mo100 superior on other treatments compared with the lowest fat content in the control. The Zn100 exhibited a superior raw fiber content in the fruit bodies by 19.80%. Meanwhile, the Mn100 recorded the highest caloric value reaching to 382.80 calories 100 g-1 of dry weight.