Foliar SPAD-502 meter values, nitrogen levels, and extractable chlorophyll for red maple selections
1996
Sibley, J.L. | Eakes, D.J. | Gilliam, C.H. | Keever, G.J. | Dozier, W.A. Jr | Himelrick, D.G.
Twelve red maple selections in an existing field trial were evaluated for leaf chlorophyll content with a SPAD-502 chlorophyll meter, total foliar N concentration with a LECO CHN analyzer, and total foliar chlorophyll content (CHL) by N,N-dimethylformamide extraction. Selections included Acer rubrum L. 'Autumn Flame', 'Fairview Flame', 'Franksred' (Red Sunset), 'Karpick', 'Northwood', 'October Glory', 'Redskin', 'Schlesingeri', and 'Tilford', and A. xfreemanii E. Murray 'Autumn Blaze' ('Jeffersred'), 'Morgan' ('Indian Summer'), and 'Scarsen' (Scarlet Sentinel). 'Franksred' and 'Northwood' had the highest monthly SPAD-502 values in 1993 and 1994. Lowest SPAD-502 values were on 'Redskin' and 'Autumn Blaze' each year. Foliar N concentration ranged from 2.62% for 'Autumn Flame' to 2.01% for Redskin. CHL levels on a fresh-weight basis ranged from 5.38 mg.g-1 for 'Fairview Flame' to 3.94 mg.g-1 for 'October Glory'. SPAD-502 and extractable CHL values were correlated (r = 0.45; P less than or equal to 0.001); however, the correlation (r = 0.15; P less than or equal to 0.38) between SPAD-502 values and total foliar N concentration was nonsignificant.
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