Nitrogen, Shading Duration, Gas Exchange, and Growth of Cassava

in HortScience
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  • 1 University of Florida, Institute of Food and Agricultural Sciences, Tropical Research and Education Center, 18905 S.W. 280 Street, Homestead, FL 33031
  • | 2 University of Florida, Institute of Food and Agricultural Sciences, Everglades Research and Education Center, P.O. 8003, Belle Glade, FL 33430

The effects of applied N and shading duration on net gas exchange and growth of two southern Florida cassava (Manihot esculenta Crantz.) cultivars grown in containers were determined. Both cultivars responded similarly to shading and N with respect to the measured variables. There were no interactions between shading duration and N application rate for any of the variables measured. Tissue dry weights, total leaf N and chlorophyll concentrations, net CO2 assimilation (A), transpiration (E), water-use efficiency (WUE), and stomatal conductance (gs) were quadratically related to the concentration of N applied to the soil. The optimum N application rate for maximum growth of both cultivars was 60 mg/plant per day. Increased shading duration reduced A, E, gs, WUE, storage root number, and weight and increased the shoot : root ratio.

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