Folia Horticulturae

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The effect of differentiated nitrogen-potassium fertilization on the yield of onions grown for sets

Maria Tendaj

Department of Vegetable Crops
Agricultural University
Leszczyńskiego 58, 20-068 Lublin, Poland

The effect of mineral fertilization on the yield of onions grown for sets was estimated. The experiments were carried out on mineral soil with a moderate content of macroelements. Mineral fertilization was applied in the following doses: 75 kg N/ha (N1), 150 kg N/ha (N2), 50 kg P/ha (P), 100 kg K/ha (K1), 200 kg K/ha (K2). The following treatments were applied: N1PK, N1PK2, N2PK1, N2PK2, N0P0K0 (control, without nutrition).

It was found that mineral fertilization, irrespective of the dose in a particular treatment, caused a considerable loss of plants. The highest loss (30% on the average) was registered at the nitrogen dose of 150 kg/ha. No significant effect of mineral fertilization on the total yield of onions grown for sets was observed. However, the highest marketable yield (onions to 25 mm in diameter) and its best structure were obtained without mineral nutrition and with nutrition at the lowest doses of macroelements (N1PK1).

Tendaj M., 1991. The effect of differentiated nitrogen-potassium ferilization on the yield of onions grown for sets. Folia Horticulturae III/1: 27-37.