An inivestigation on twenty-three species vegetables of from 1987 to 1989 demonstrated that vegetables containing nitrate above 400ppm made up 69％ of the investigated,which implied that vegetables in Changsha and Xiangtan were polluted with nitrate severely,On the other hand,the nitrate content of vegetables varied with vegetable species.In order of decreasing nitrate coritent,they were foliage vegetable(1267ppm),onion and garlic(521ppm)and fruit vegetables(184ppm).The accummlation varying with tissues and growth periods in the same vegetable ...
