ISHS Acta Horticulturae 563: International Conference on Environmental Problems Associated with Nitrogen Fertilisation of Field Grown Vegetable Crops
EFFICIENCY OF FOLIAR NUTRITION OF FIELD VEGETABLES GROWN AT DIFFERENT NITROGEN RATES |
| Authors: | E. Kolota, M. Osinska |
| Keywords: | cabbage (Brassica oleracea L. var. capitata L. ), onion (Allium cepa L.), cucumber (Cucumis sativus L.), multicomponent fertilizer, foliar nutrition, yields, downy mildew (Pseudoperonospora cubensis) |
| Abstract:
A multi-component fertilizer Ekolist U containing 11 essential nutrients, which is also recognized as being effective against some fungal diseases, was used in a field study to examine foliar nutrition of cabbage, onion and cucumber. Available P and K in the soil was similar for all crops and experimental treatments, while preplant nitrogen was equal to half or full recommended application rate (100 and 200 kg N/ha for cabbage, 75 and 150 kg N/ha for onion and cucumber). Foliar applied fertilizer in concentrations of 1.5% and 3.0% was sprayed four times during the intensive period of plant growth at two week intervals, using 1000 l water solution per ha each time. Results showed the benefits of foliar applied plant nutrients in treatments with half rates of preplant N fertilization, however, only a small additional effect was observed if the full recommended preplant rate of N was applied. The maximum increase in marketable yield using supplementary foliar fertilization was 20.3% in cabbage, 10.8% in onion and 7.3% in cucumber. Foliar fertilization significantly decreased the level of cucumber leaf infestation by downy mildew (Pseudoperonospora cubensis). | |
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