Difference between Burley Tobacco and Flue-Cured Tobacco in Nitrate Accumulation and Chemical Regulation of Nitrate and TSNA Contents

Table 2

ANOVA comparison of the effects of regulatory treatments, year, and tobacco variety and their interactions on TN, NO₃-N, NO₂-N, alkaloid, and TSNA concentrations in tobacco.

Types	Effect	TN	NO3-N	NO2-N	Alkaloid	TSNAs	DF
Flue-cured tobacco	Year (Y)	0.05	0.20	0.01	1.60	0.04	1
	Treatment (T)	9.01	15.33	0.21	4.65	7.19	3
	Year (Y) × Treatment (T)	8.54	55.61	13.71	5.73	30.52	7
Burley tobacco	Variety (V)	0.97	0.18	11.08	0.02	1.18	1
	Treatment (T)	3.59	19.34	0.97	0.28	18.68	3
	Variety (V) × Treatment (T)	5.66	275.57	28.41	13.14	274.77	7

-values and significance levels are given (, , and ).