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Growth models for helianthus annuus and zinnia elegans

, : Growth models for helianthus annuus and zinnia elegans. Journal of the American Society for Horticultural Science 101(4): 475-479

A 2nd degree central composite rotatable experimental design with 5 environmental variables (root temperature, day and night temperature, daylength and light intensity) was used to estimate growth response surfaces for H. annuus cv. 'Mammoth' and Z. elegans cv. 'Eldorado' grown in controlled environment chambers. Fresh and dry wt of shoots, dry wt of roots and total dry wt for sunflowers produced estimated equations suitable for 1st approximation response surfaces. The model predicted maximum growth (weight) of sunflowers occurred outside of the design space. More experimentation is needed at root temperature > C, day/night temperature >, light intensity > 37800 lx and daylength > 23 h to find those conditions that maximize growth with the 5 environmental variables in the present study. Additional experiments at the boundary of design space are suggested for substantial improvements in the present model for sunflowers. In zinnia lack of significance of the estimated equations was observed for all measured growth parameters (fresh and dry weight of shoots, dry weight of roots, total dry weight, number of leaves, stem length and leaf area). A leaf disorder resembling Ca deficiency was noted on zinnia plants grown at a root temperature of C.

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