ISHS Acta Horticulturae 294: II Symposium on Horticultural Substrates and their Analysis, XXIII IHC
EFFECTS OF CA-STRESS ON BLOSSOM-END ROT AND MG-DEFICIENCY IN ROCKWOOL GROWN TOMATO |
| Authors: | C. Sonneveld, W. Voogt |
| Abstract:
In an experiment with tomato grown on rockwool, the effect of a Ca-stress period of three weeks on the appearance of Ca- and Mg-deficiency symptoms was studied. Two weeks after the beginning of the stress period, the top leaves and the young fruits were affected by Ca-deficiency. Fruits being 7–10 days old seemed to be most sensitive to the deficiency (blossom-end rot). A stress period in young tomato plants under high radiation intensity resulted in more severe symptoms than did such a period in older plants under moderate radiation intensity. A Ca-stress period also had a strong effect on Mg-deficiency incidence. An early stress period prevented the appearance of Mg-deficiency symptoms at first. Later on, mild symptoms appeared. A late Ca-stress period prevented symptom appearance for the whole growing period or reduced the severity of the symptoms already developed before the beginning of the stress period. Results of tissue tests showed that a Ca-stress period affected the location and the redistribution of Mg in tomato plants. | |
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