content in upper and lower leaves of the two tobacco varieties CB-1 and K326 after 9 days of growth under HN (10 mmol L−1) and LN (1 mmol L−1). Different letters above columns within each leaf stratum denote significant differences at P ≤ 0.05
content in upper and lower leaves of the two tobacco varieties CB-1 and K326 after 9 days of growth under HN (10 mmol L−1) and LN (1 mmol L−1). Different lettersabove columns within each leaf stratum denote significant differences at P ≤ 0.05