The paper stuffed with ten important melon and vegetables,studied the injury symptom,dose reaction,injury threshold value to SO2.The result indicated the followings: 1.The outer symptom polluted by SO2 was obviously different in various plants,and primarily appears in leaves.The symptom in the leaves of the offered ten plants can be classified into gray spots develop between lines,yellow spots develop along line and mix four types.Treat dose directly affect the injury symptom type,occurrence time,injury deg...
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