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Pollution Effect and the Accumulative Rules of Lead in the Loam Soil/Rice System

KANG Li juan 1,ZHAO Cheng ai 1,LI Na 2 (1.Department of Basic Science, Jilin Agricultural University,Changchun 130118; 2.Siping Grain College of Jilin Province, Siping 136000)  
The pot experiment was conducted to study on the pollution effect and the residual rules of lead in the loam paddy soil/rice system The results showed that the toxicity effect of lead on rice was not serious and decreased yield about 2%~17% when lead rates were 180~720?mg/kg The tissues of rice contents increased with the lead addition in the soil The accumulation order of lead was rootstem and leafgrain Lead residual amount of rice seed was less than the food hygiene standard, the critial concentration in the soil was 241?mg/kg (total) and 49 mg/kg (DTPA exrtacted)。
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