《Table 1 Effects of different temperature differences between dry and wet bulbs in yellowing stage o

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《Curing Technology for Improving the Quality of Upper Tobacco Leaves》

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As shown in Table 1，as the temperature difference between dry and wet bulbs increased，the contents of nicotine，total nitrogen，starch，protein and chlorine in the upper tobacco leaves gradually increased，and the contents of total sugar，reducing sugar，potassium，total phenols and free amino acids decreased.（i）Top 1-3.The contents of nicotine，total nitrogen，starch，protein and chlorine in the T1group were reduced by 10.88%，8.81%，4.61%，2.12%and5.26%，respectively compared those of the CK.Compared with the CK，the contents of nicotine were increased by 2.12%and3.74%，respectively，and the contents of chlorine were increased by 10.53%and 15.79%，respectively in the T2and T3treatment groups.Compared with those in the CK，the content of total sugar was reduced by 5.41%，the content of reducing sugar was increased by 7.71%，the content of total phenols was increased by0.35%，the content of free amino acids was increased by 5.51%，and the content of potassium was increased by 1.18%in the T1treatment group.Compared with those in the CK，the contents of total sugar were reduced by 1.48%and 1.66%，respectively，the contents of reducing sugar were reduced by 2.87%and 11.46%，respectively，the contents of potassium were reduced by 1.18%and 2.96%，respectively，the contents of total phenols were reduced by 0.35%and 1.73%，respectively，and the contents of free amino acids were reduced by 6.55%and 12.54%，respectively in the T2and T3treatment groups.（ii）Top 4-6.Compared with those in the CK，the contents of nicotine，total nitrogen，starch，protein，chlorine，and total sugar were reduced by10.89%，19.25%，21.00%，14.26%，5.88%and 4.12%，respectively，and the contents of reducing sugar，total phenols，free amino acids and potassium were increased by 2.81%，0.35%，22.69%and 0.67%，respectively in the T1treatment group.Compared with those in the CK，the contents of nicotine were increased by 7.26%and 9.22%，respectively，the contents of total nitrogen were increased by 3.29%and 11.74%，respectively，the contents of starch were increased by 11.82%and 12.91%，respectively，the contents of protein were increased by 2.29%and2.71%，respectively，and the contents of chlorine were increased by 0.15%and 2.71%，respectively，the contents of total sugar were reduced by 5.90%and 11.27%，respectively，the contents of reducing sugar were reduced by 8.10%and 10.55%，respectively，the contents of potassium were reduced by 8.16%and9.48%，respectively，the contents of total phenols were reduced by 0.35%and 4.21%，respectively；and the contents of free amino acids were reduced by 10.69%and 14.29%，respectively in the T2and T3treatment groups.