ISHS Acta Horticulturae 339: Workshop on Ecological Aspects of Vegetable Fertilization in Integrated Crop Production in the Field
INFLUENCE OF NITROGEN SUPPLY ON THE OCCURENCE OF CALCIUM DEFICIENCY IN FIELD GROWN LETTUCE |
| Authors: | I. Brumm, M. Schenk |
| Keywords: | Lactuca sativa, physiological disorder, Nmin residue, root/shoot ratio |
| Abstract:
In field experiments with lettuce (Lactuca sativa L.) the influence of N supply on the incidence of tipburn was investigated. Tipburn is a common physiological disorder in lettuce caused by Ca deficiency. Tipburn increased with N supply in all experiments. This was mainly related to an increase in head size as well as to a specific N effect going beyond the stimulation of growth. This specific N effect on tipburn was not accompanied by low Ca concentration in the dry matter of inner leaves or by changes in head morphology but by a decreasing root/shoot ratio. The experiments showed additionally that a supraoptimal N supply not only increased the risk of tipburn but also the Nmin residue at harvest in the soil and thus the risk of nitrate leaching. | |
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