ISHS Acta Horticulturae 255: III International Symposium on Soil Desinfestation
TREATMENT OF TOMATO SEEDLINGS WITH SUBLETHAL DOSAGES OF DAZOMET AS A POSSIBILITY OF INCREASING TOMATO RESISTANCE TO DAZOMET RESIDUES IN THE SOIL |
| Author: | C. Slusarski |
| Abstract:
The tolerance of tomato plants to the phytotoxic after-effects of dazomet breakdown products in the soil can be markedly increased by previous application of the same compound in sublethal amounts to the potting compost used for transplant production. Dazomet was applied at the dosages ranging from 0 to 30 mg per 1 kg of the growing medium, expressed on a dry weight basis, immediately before sowing and/or before pricking out the two-week old seedlings. After planting 44-day old tomato transplants into the greenhouse soil containing 15 or 30 ppm of dazomet, transient phytotoxicity symptoms, yellowing of the oldest leaves and temporary wilting, usually were more pronounced on plants which as seedlings had not been pretreated at all, or if dazomet had been added only before sowing. A significant improvement of tomato tolerance to dazomet residues in the soil was achieved only in the case of adding 30 ppm of that compound to the compost just before pricking out. All plants from this treatment survived in the greenhouse soil a dazomet concentration of 30 ppm, whereas 4 to 33 % plants from other pretreatments were killed at that concentration. | |
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