Using the method of GC-ECD detect the residual DDT in the early and late rice from eleven cities of Jiangxi province. The results show that DDTs are detected both in the early and late rice. Residual DDT in early rice varies from 2.846μg/kg to 147.413μg/kg and the average level is 64.929μg/kg while to the late rice, residue is in the range of 26.900-163.920μg/kg and average level is 84.182μg/kg, the residual DDT in both of the two kinds of rice are under the limited value of national food hygiene standards. At the same time, there are big differences in different regions. The DDT’s coefficient of variation in early rice and late rice are 76.26% and 61.23% respectively. The industry makes a contribution to the different residual of DDT between early and late rice. Results also show that 60% of regions in Jiangxi province have new input of DDT，relevant departments should pay attention on it. Meanwhile, the new input of DDT in the early rice from Yingtan and late rice from Ji’an probably comes from atmospheric deposition or usage pesticides containing DDT.

A hydroponic culture experiment was conducted to study the effect of temperature and nutrient level on Cd accumulation inTagetes erectaL.. In the first experiment, shoot Cd accumulation and transpiration rate at different temperature was determined. Cd accumulation was lower with higher transpiration rate at 35°C than that of 25°C or 15°C with lower transpiration rate. In the other experiment, cadmium accumulation of plants varies significantly under the condition of different nutrient supplication. Contents of Cd in roots were not high, but the contents of Cd in shoots were the highest when plants were cultivated in 0.05-fold Hoagland’s solution. Roots Cd accumulation decreased as the concentration of single nutrient element (N, P, S) decrease or absence, and shoots Cd accumulation decrease in the condition of sulfur deficiency and sulfur absence. It was shown that transpiration is not the primary factor affecting Cd accumulation inTagetes erectaL, but growth rate of plants has certain correlation with Cd accumulation; contents of Cd in roots are most affected by the supplication of nutrient elements, yet shoots accumulation is relatively lagging behind; different nutrient element has some different effect on Cd accumulation, and the effects of nitrogen and sulfur on the shoots Cd accumulation are the greatest.