The contents and distribution of Pb, Cd and As in 497 flue-cured and 17 burley tobacco leaf samples collected from major tobacco production regions of China in 2004 were studied.
2
突变分析表明，豫西烟区烤烟生育期的日照时数在1981年发生突变。
Mutation analysis showed that the saltation of sunshine durations at tobacco growth period in western Henan occurred in 1981.
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