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Growing of greenhouse tomato from seedlings at different stages of development at various temperatures of the air and nutrient solution. I. Growth and yields of plants

W. Sady*, S. Rożek**, J. Myczkowski**

**Institute of Vegetables and Ornamental Plants
**Department of Plant Physiology
**Faculty of Horticulture, Agricultural University
**29 Listopada 54, 31-425 Kraków, Poland

It was found that a higher air temperature (17°C) at night stimulated the vegetative growth and increased the early and total yield of tomato as compared with a lower one (11°C). When the temperature of the nutrient solution was increased to a constant value of 20°C the total yield of fruit rose, irrespective of the air temperature. At a night air temperature of 17°C, associated with a nutrient solution temperature of 20°C, the growth of the main stem and roots was inhibited while the fruiting of plants began earlier. At the lower air temperature (11°C) a constant nutrient solution temperature of 20°C delayed harvest.

Planting tomato seedlings at a more advanced stage of development (with 7-8 true leaves) decreased early yields, though the total yield was higher than that obtained from tomatoes with 3-4 or 5-6 true leaves, irrespective of the temperature of the air and of the nutrient solution.

Higher air temperatures at night improved the supply of N-NO3 and K for plants, while tomatoes grown in nutrient solution with a constant temperature of 20°C contained more N-NO3, P, and K than those grown at natural temperatures of the nutrient solution.

Sady W., Rożek S., Myczkowski J., 1991. Growing of greenhouse tomato from seedlings at different stages of development at various temperatures of the air and nutrient solution. I. Growth and yields of plants. Folia Horticulturae III/3: 65-79.