ISHS Acta Horticulturae 401: International Symposium on Growing Media & Plant Nutrition in Horticulture
EFFECT OF THE pH ON ROCKWOOL GROWN CARNATION (DIANTHUS CARYOPHYLLUS) |
| Author: | W. Voogt |
| Abstract:
An investigation was carried out on the effects of pH with carnation (cultivars ‘Red Debby’ and ‘Adelfie’) grown in rockwool. The pH was achieved by varying the NH4:NO3 ratio. The yield of the two first flushes of flowers was increased with decreasing pH. With ‘Red Debby’, this was also the case over the whole growing period. With ‘Adelfie’, however, so called ‘flagging’ plants appeared in the second half of the growing period, which became more severe with decreasing pH. The positive yield effect at lower pH levels could be caused by the increased uptake of micro elements (except for Mo). The P levels in flagging plants were increased strongly with decreasing pH, compared with normal plants. From this investigation the causes of ‘flagging’ could not be clarified. | |
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