《Table1 Comparison of treatments of agronomic characters of flue-cured tobacco》

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《Effects of Amount of Green Manure Returned to Field on Yield and Quality of Flue-cured Tobacco》

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Values followed by different letters in the same column are significantly different（P<0.05）.

The yield and quality results of different treatments are shown Table 2.It could be seen from Table 3 that tobacco yield was in significant positive correlation with small and moderate amounts of green manure returned to field，but had no significant correlation with large amount of green manure；inferior tobacco proportion was in significant negative correlation with small and moderate amounts of green manure returned to field，but in significant positive correlation with large amount of green manure returned to field；and superior and medium tobacco proportions had significant positive correlation with small and moderate amounts of green manure returned to field，but no significant correlation with large amount of green manure.Above analysis showed that small amount of green manure returned to field mainly affected tobacco yield and quality；moderate amount of green manure returned to field mainly played a leading role in improving tobacco yield and quality；and large amount of green manure returned to field mainly affected inferior tobacco proportion.The path analysis on amount of green manure returned to field indicated that the effect of moderate amount of green manure returned to field on yield and quality was best，followed by the effect of small amount of green manure returned to field on yield and quality，while large amount of green manure returned to field was no good on yield and quality（Table 4）.