Mutation analysis showed that the saltation of sunshine durations at tobacco growth period in western Henan occurred in 1981.
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.
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。
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