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Non-NPK-fertilized tomato plants. Plants were derived from T. harzianum T34-uncoated (-T34) or -coated (+T34) seeds, and were treated with salt stress (2 l of a 300 mM NaCl solution per 10 plants) at 32 and 36 days (+salt) or not (-salt). The photograph was taken when the plants were 39 days old.
