RELATIONSHIP OF TEMPERATURE AND MINERAL NUTRITION TO CARBON DIOXIDE ENRICHMENT IN THE FORCING OF POT CHRYSANTHEMUMS

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Abstract
Spring and fall greenhouse crops of pot chrysanthemum, Chrysanthemum morifolium Ram. cult Improved Princess Anne, were raised under two temperature regimes, three levels of atmospheric carbon dioxide, and four mineral nutrition treatments. The temperature–carbon dioxide interaction was the most important relationship among these factors in affecting the growth and maturity of the plants. Of the treatments used, carbon dioxide at 1,000 ppm and temperatures of 15 C night and 20–24 C day appeared to be best in producing a compact pot chrysanthemum with a satisfactory flower size. Nutrient levels tested were of minor importance in influencing the effects of temperature or carbon dioxide level.

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