Folia Horticulturae

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Effect of nitrogen fertilization on growth and development of Pelargonium × hortorum. I. Effect of different N levels

Agnieszka Lis-Krzyścin

Department of Soil Cultivation and Fertilization
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

The experiment was carried out in 1995-1996. The plants were grown in pots in the greenhouse. The pots (2 dm3) were filled with compost and peat (c/v 2:1). Six levels of nitrogen were tested: 100, 120, 140, 160, 180, and 200 mg N dm-3 of substrate. Phosphorus and potassium content was constant - 90 mg P and 250 mg K dm-3. The substrate was analysed at 3 week intervals, nitrogen and the other macroelements being adjusted to the established levels. As the increasing amounts of nitrogen fertilizer, 100-200 mg N dm-3, were introduced in the substrate the main shoots greatly lengthened and the number of offshoots and inflorescences increased. Nitrogen fertilization at the levels 160, 180, and 200 mg N dm-3 of substrate resulted in very intence plant growth and blooming. The level 160 mg N dm-3 should be regarded as the lower limit for the optimal nitrogen rate throughout its growth.

Lis-Krzyścin A., 1999. Effect of nirogen fertilization on growth and development of Pelargonium × hortorum. I. Effect of different N levels. Folia Horticulturae 11/1: 45-52.