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《Acta Ecologica Sinica》 1981-03
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Cheng Borong Ju Shanjian Yue Shurong Sheng Shijun He Rongzhen and Zhang Guilan(Institute of Forestry and Pedology, Acadetmia Sinica)  
A Kind of disease called ke shan disease occurred among the people in certain districts of our country. It was discovered that the water soluble selenium content in soil and the selenium content in both the cereals and human bodies in the disease district were all lower than that in the nondisease district. Hence this kind of disease is related to the dificiency of selenium in the eco-environment.The amount of water soluble selenium that can be absorbed by plants in the different disease districts was from 0.2 to 0.8 ppb. While that of the non disease districts was 1.24 to 1.88ppb. The change of the selenium contents in the cereals and the people (human) hairs has similar tendency. The water soluble selenium contents were related with the zonal soil distribution.For the prevention of the disease, we sprayed the cereals crops in the disease dirtricts with sodium selenite. The dosage used was 7.5 to 15.0g/ha. The selenium contents of the crops thus treated were all increased, for example, the selenium contents of corn and wheat increased three-fold. The selenium contents of the persons who have eaten the selenium treated cereals were all iincrease (about%) and the rate of the disease occurrence was reduced, beside, the yields of the crops were creased.
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