Folia Horticulturae

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Effect of the planting date on macronutritional status of pot chrysanthemums from the Time group in all-year-round culture

Włodzimierz Bre¶*, Marek Jerzy**

**Department of Horticultural Plant Nutrition
**Faculty of Horticulture, Agricultural University in Poznań
**Zgorzelecka 4, 60-198 Poznań, Poland
**Department of Ornamental Plants
**Faculty of Horticulture, Agricultural University in Poznań
**D±browskiego 159, 60-594 Poznań, Poland
**e-mail: wbnaw@au.poznan.pl

The aim of the study was to evaluate the usefulness of critical levels of macroelements recommended for a conventional method of culture for diagnosing the macronutritional status of Time group chrysanthemums in all-year-round culture. Four pot cultivars of the chrysanthemum Dendranthema grandiflora Tzvelev (syn. Chrysanthemum × grandiflorum /Ramat./ Kitam) were selected for the experiment: ‘Esperanto Time’, ‘Icon Time’, ‘Jewel Time’, and ‘Solar Time’. The research embraced 12 growth cycles starting on the second day of each month throughout the year 2002. From the moment of potting, the plants were treated with a short day. In periods of naturally long days, the day was shortened to 10.5 hours with the use of a black-out cover. No supplementary illumination was used from November to mid-February (a photoperiod of under 10 hours). The plants grown in peat substrate were fed using the fertigation system. The time of culture and the insolation associated with it had a significant effect on the content of nitrogen, phosphorus, potassium, calcium, and magnesium in the leaves. The time of culture affected the nitrogen and potassium levels the most, and magnesium the least. The critical levels of macroelements recommended for conventional and hydroponic methods of culture turned out to be of little use for diagnosing the nutritional status of Time group chrysanthemums in all-year-round culture. It is necessary to work out new critical or guide values allowing for the cyclicity of culture in various light conditions and the fertigation of plants grown in a limited volume of medium.

Bre¶ W., Jerzy M., 2004. Effect of the planting date on macronutritional status of pot chrysanthemums from the Time group in all-year-round culture. Folia Horticulturae 16/2: 127-139.