Nutrient Dilution by Starch in CO2-enriched Chrysanthemum |
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Authors: | KUEHNY, JEFF S. PEET, MARY M. NELSON, PAUL V. WILLITS, DAN H. |
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Abstract: | Increasing growth irradiance and CO2 generally decreases foliarnutrient concentration on a dry weight basis and increases foliarstarch concentration. However, the extent to which starch concentrationsdilute foliar nutrient concentrations when thelatter are expressed on a dry weight basis is not known. Todetermine the importance of differential starch accumulationin calculating nutrient concentrations on a dry weight basis,leaf nutrient and starch concentrations were measured in Chrysanthemum? morifolium Fiesta (Ramat.) cuttings grown atthree irradiance levels and two CO2 levels for eight weeks inboth winter and spring. On a dry weight basis, foliar concentrationsof most nutrients were lower in both seasons as a result ofthe elevated CO2 and irradiance levels, and total dry weightswere higher. Per cent starch was greater at the high CO2 levelin both seasons but was only greater at higher irradiances inthe winter experiment. When starch was subtracted from the leafdry weights, the differences between CO2 and irradiance treatmentsdisappeared with respect to N, P, K, Ca, Mg, S, and B but notfor Fe, Mn, Zn, and Cu. Key words: CO2 enrichment, starch, nutrients, irradiance |
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