1983 Volume 52 Issue 3 Pages 302-307
An experiment was conducted to determine the effect of macro- and micro-elements, and boron (B) on growth, keeping quality and leaf marginal burn in chrysanthemum (Chrysanthemum morifolium Ramat. cv. Seikonohana). Thirty day old cuttings were planted in wooden containers (40×40×12cm) filled with sand, and grown in a greenhouse, under normal photoperiodic conditions. Four plants were grown in each container. There were 6 treatments consisting of 2 levels of macro- and micro-elements and 3 levels of B at 0.5, 1.0 and 1.5ppm as shown in Table 2. Treatments were replicated 4 times. Treatment solutions were applied to the sand medium from July 11 to flowering (approximately 0.5 liters/container/time), twice on clear days, once on cloudy days and none on rainy days. Plant height decreased in the treatments receiving high macro-elements. Fresh weight of cut flowers decreased in the treatments with low macro-elements + high B. When macro-elements or B were high, dry weight of roots decreased. Keeping quality of cut flowers decreased by 18 to 22 days in the high B treatments compared with the treatment with the treatment with low macro- and micro-elements and low B. Flowering date was not affected by any treatments. Marginal burns on the lower leaves of the plant in the treatment with low macro-elements and high B appeared in late August and those in the treatment with high macro-elements and high B or with medium B did in early September. Thereafter, these symptoms developed towards upper leaves. Marginal burn was highly correlated with B content in the leaves. B was slightly higher in the lower leaves.