Study on Pb absorption, accumulation and distribution pattern in tomato.

The pot experiment was carried out to study the Pb absorption,accumulation and distribution pattern in tomato.The results showed that Pb began to have the effect on growth of tomato plants when Pb concentration was 12.5 mg/kg,the Pb accumulation quantity and intensity of tomato stems,leaves and roots increased with increment of Pb concentration.The maximum accumulation quantity of leaves at late fruit-bearing stage and stems at full fruit-bearing stage was 625.431 mg/plant and 198.753 mg/plant respectively when Pb concentration was 100.0 g/kg.The maximum accumulation quantity of roots at early fruit-bearing stage was 267.542 mg/plant when Pb concentration was 200.0 g/kg.The Pb accumulation intensity increased with increment of Pb concentration and the maximum daily Pb accumulation quantity was up to 14.93 mg/plant when Pb concentration was 100.0 g/kg.