Akademik Veri Yönetim Sistemi
GESUNDE PFLANZEN, cilt.75, sa.4, ss.1047-1060, 2023 (SCI-Expanded)
Recycling the charred agricultural residues as a soil conditioner combines the advantages of cycling back the plant nutrition, sequestering carbon, and fixing heavy metals. Cadmium (Cd) as a trace component of fertilizers, is a highly mobile in the soils and is very problematic for plant growth and healthy food production. Cadmium mobility and plant uptake is highly limited in the reduced soil environment. Therefore this study mainly focused on investigating the effects of rice straw biochar (BC) on Cd availability and adsorption at two moisture contents (75% and 100% of the field capacity, FC) and Cd uptake by rice plants. The experiments were set up in completely randomized design in the factorial arrangement by adding increasing doses of BC (0, 2.5, and 5%) and Cd (0, 2.5, 5, and 10 mg kg(-1)) to soils. Adsorption/desorption and the incubation experiments were executed prior to the pot experiment. The results showed that different moisture regimes had significant effects on the Cd adsorption parameters. Of the isotherms determined, the Freundlich isotherm better fitted to the Cd sorption data than the Langmuir isotherm. The maximum Cd adsorption of the soils varied between 515.4 and 1455 mg kg(-1). The Freundlich n parameter ranged between 0.17 to 0.41 mL kg(-1), while the Kf parameter showed a very narrow range (264.3-298.1 mg kg(-1)). The DTPA extractable Cd concentrations were: 1.44, 1.58 and 1.74; 0.179, 0.206 and 0.292 mg kg(-1) for 5, 2.5 and 0% BC treatments at 75 and 100% of FC, respectively. The efficiency of BC to reduce Cd bioavailability was significantly pronounced under wet moisture content. The Cd concentration of the grain decreased by the BC treatments. The plant uptake was also limited to some extent by the rice plants. Therefore, reduced materials such as BC can facilitate a faster reducing environment to mitigate Cd mobility in paddling soils, and the rice straw can be considered an economically feasible and environmentally friendly indigenous material for BC production.