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Abstract Taking tomato variety L402 seedlings as experimental material，this paper studied the tomato
growth and the control effects of gray mold of Na2CO3 and NaHCO3. Results showed that 25 mmol·L-1 and 50
mmol·L-1 Na2CO3 and NaHCO3 had remarkable role of strengthening tomato seedling；30-60 mmol·L-1 Na2CO3
and NaHCO3 had inhibiting effect of different degrees on the growth of gray mold hypha. And its inhibition role was
strengthened along with the increase of its concentration. Both 30-40 mmol·L-1 Na2CO3 and 50-60 mmol·L-1
NaHCO3 had good preventive role on tomato gray mold. While，50 mmol·L-1 Na2CO3 and 50-60 mmol·L-1
NaHCO3 had good inhibiting effect on tomato gray mold. Consequently，suitable concentration of Na2CO3 and
NaHCO3 can be applied in tomato production for controlling gray mold.
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