Abstract
Melon ( Cucumis melo L. var. Maestro) plants were grown in soilless culture under plastic tunnels. A 17-day calcium deficiency was applied to plants bearing fruits of various ages (between 3 and 20 days after anthesis) and the fruits were harvested between 20 and 37 days after anthesis. The calcium concentrations in the fruits of the control plants decreased between 20 and 37 days after anthesis (ripe fruit): the decrease in calcium concentration was steady in the flesh whereas it occurred only in the last few days in the rind. Calcium accumulation within the fruit occurred quite early: 80% of calcium present in ripe fruit was already there 20 days after anthesis. Thus, a calcium deficiency applied to 20-day-old fruits had no significant effect on the calcium content at the time of harvest. In contrast, younger fruits were very susceptible to calcium deficiency and displayed a significant decrease in calcium content.
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