Folia Horticulturae

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Effect of magnesium fertilization on yield of fruits and mineral state of greenhouse tomatoes (Lycopersicon esculentum Mill.)

Eugeniusz Kołota, Anita Biesiada

Department of Vegetable Crops
University of Agriculture
Cybulskiego 34, 50-205 Wrocław, Poland

In 1986-1987 a greenhouse experiment was carried out in order to determine the effect of different magnesium rates on the yield and nutritional state of four tomato cultivars. The cultivars Nortona, Bisena, Celena, and Kos were grown in plastic rings on tables. Magnesium was applied at the rates of 150, 300, 450, 600 mg/dm3 of peat substrate, kieserite being used as the source of this nutrient. To determine the mineral state of plants, samples of leaves were collected three times during the vegetation period. Petioles of the fifth leaf from the top of the plant were considered as indicative parts in which NO3-N, P, K, Mg, and Ca were determined. The results of the experiment showed that the optimum available magnesium content in the peat substrate for plant growth and fruit yield was 300-450 mg/dm3. A lower supply of magnesium (150 mg/dm3) was favourable for the early ripening of tomato fruit this resulting in a significant increase in early yield.

The level of 0.4-1% Mg in samples of petioles indicated a proper nutritional state of greenhouse tomatoes. High rates of magnesium caused a decrease in Ca, K, and NO3-N content and enhanced the uptake of P by the plants.

Among the tested cultivars Nortona appeared to give the best yield but Kos was the earliest.

Kołota E., Biesiada A., 1990. Effect of magnesium fertilization on the yield of fruits and mineral state of greenhouse tomato (Lycopersicon esculentum Mill.). Folia Horticulturae II/1: 41-52.