In addition, the increased plant growth in a sterilized soil is related to the enhanced root growth, increased nutrients uptake (increasing photosynthesis as a result of higher leaf area and higher concentrations of N and P in the plant shoot), or both and the inhibition of soil pathogens as the process of soil sterilization can also affect the microbiological properties of the sterilized soil (Troelstra et al., 2001). Inoculation with AM under stress can also further contribute to such enhancement (Miransari et al., 2007, 2008) by increasing plant water and nutrients uptake. Interestingly, is has been shown that sterilization increase plant P uptake (30–57% higher than P uptake in unsterilized sand) more effectively, than N and K uptake (Troelstra et al., 2001), which is in agreement with our results. This is also another indication that AM fungi can be more effective under sterilized conditions because N and P uptake were also increased by AM at the highest soil compaction (C4) in the second experiment. Although AM have the ability to alleviate the stress of soil pathogens under unsterilized conditions, however the suggested findings indicate that sterilized conditions are more ideal for optimal AM activities
In addition, the increased plant growth in a sterilized soil is related to the enhanced root growth, increased nutrients uptake (increasing photosynthesis as a result of higher leaf area and higher concentrations of N and P in the plant shoot), or both and the inhibition of soil pathogens as the process of soil sterilization can also affect the microbiological properties of the sterilized soil (Troelstra et al., 2001). Inoculation with AM under stress can also further contribute to such enhancement (Miransari et al., 2007, 2008) by increasing plant water and nutrients uptake. Interestingly, is has been shown that sterilization increase plant P uptake (30–57% higher than P uptake in unsterilized sand) more effectively, than N and K uptake (Troelstra et al., 2001), which is in agreement with our results. This is also another indication that AM fungi can be more effective under sterilized conditions because N and P uptake were also increased by AM at the highest soil compaction (C4) in the second experiment. Although AM have the ability to alleviate the stress of soil pathogens under unsterilized conditions, however the suggested findings indicate that sterilized conditions are more ideal for optimal AM activities
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