ISHS Acta Horticulturae 274: International Symposium on Diagnosis of Nutritional Status of Deciduous Fruit Orchards
DETERMINATION OF DRIS INDICES FOR APPLE (MALUS DOMESTICA BORKH) |
| Authors: | E. Szücs, T. Kállay, Gy. Szenci |
| Abstract:
Nutritional values and yield data of 18 representative orchards were assessed in three consecutive years. DRIS indices indicated that lower crops were correlated to oversupply of potassium and undersupply of phosphorus while nitrogen status was neutral, when norms were established by the traditional method (Beaufils, 1973). Norms, estimated by quadratic regression analysis for NP-1, NK-1 and KP-1 showed a general oversupply of potassium and a relative undersupply of nitrogen and phosphorus, indicating that norms obtained by regression analysis signify rather the extremities of nutrition-crop relations than those produced by the traditional DRIS method. In the case of apple trees low values of NII were not correlated to low crops, indicating that low crops may upset the nutritional balance. | |
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