Abd El-Hamid E.A. Sherif and Ibrahim M. Gomaa( 2017). Environmental effect for rice straw grown in some Delta soils, as a growth media and its effect on Mushroom quality.Australian Journal of Basic and Applied Sciences, 11(9) June 2017, Pages: 202-214
Abstract: The purpose of this study is to evaluating water quality and soil in which rice straw is grown in some Delta soils, to use as growth media for edible mushrooms and determines its ability to accumulate some micro-elements and heavy metals in its tissues. The risk assessment of some micro-elements and heavy metals accumulation in edible mushrooms. So water, soils, and rice straw samples were collected after rice yield harvesting at summer season 2016 from five Governorates; namely, El-Sharqia (QI), El-Beheira (BH), Kafr El-sheikh (KS), El-Gharbia (GH) and El-Dakahlia (DK). An experimental was conducted in Training Center Recycling of Agricultural Residues (TCRAR), Mushtuhur, Toukh, El Qalyubia Governorate Egypt.
Results obtained that: Electric conductivity (EC) in the water at different Governorates understudying; were medium to saline; pH was neutral to alkaline; Sodium Adsorption Ratio (SAR) was low. (KS) The soil was saline-sodic soils; but (BH) soil was sodic soil, as well as (DK), (QI) and (GH), were non-saline-alkali soils. Content of macro, micronutrients and heavy metals were a very low concentration in all Governorates. Low concentration of micro-elements and heavy metals in rice straw grown at (BH) Governorate, also increasing elements at (KS) and (GH) Governorates; as well as Pb in straw collected from (QI) was high Governorate. The content of micro and heavy elements in all stem and fruit samples for the safe consumption level of the edible parts of the mushroom was within the permissible limits where the concentrations of the elements and the concentrations were in the following order Fe > Mn > Zn > Cu > Ni > Pb > Cd. Bio-concentration factors (BCF) and the translocation factor (TF) in edible mushroom were lower than 1 for all studying elements. The estimated weekly intake of all elements under study from edible mushroom was lower than the provisional tolerable weekly intake. For microelements and heavy metals determined in edible mushroom; the target hazard quotient was far below 1. Rice straw can be used from the previous Governorates as a growth media for edible mushrooms without any expecting risks to human health.
Keywords: (Soils quality, rice straw, Mushroom, heavy metals, accumulation, Bio-concentration, translocation factor.)
