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Alleviation of salt stress in turfgrass by Nano-compost with inoculation of microbial isolates from compost

Lian Duo, Xujiao Hou, Chunxiang Liu and Shulan Zhao

High soil salinity is an important factor to limit turfgrass growth due to insufficient precipitation, inappropriate water management and salts from road deicers or fertilizers. A greenhouse experiment was performed to examine the roles of nano-compost, either alone or in combination with salinity-tolerant microbial isolates, in alleviating the detrimental effects of salt stress on turfgrass. Municipal solid waste (MSW) compost was processed into nano-sized particles, and microorganisms in the compost were screened for salinity stress tolerance using increasing concentrations of NaCl. Tall fescue plants were treated with nano-compost and microbial isolates under three salt levels (0.3, 0.6 and 0.9% of NaCl). The results showed that the turfgrass quality decreased, malonyldialdehyde (MDA) content and superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) activities in the plants increased as salt level increased. However, the application of nano-compost, either alone or in combination with a microbial inoculum, improved the turfgrass growth, increased the chlorophyll (Chl) contents of the plants, decreased the plant MDA contents and further enhanced antioxidant enzyme activities in the salinity-stressed plants. Our results suggest that nano-compost combined with a microbial inoculation enhances the salinity tolerance of turfgrass by alleviating the oxidative stress

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