Changes of nutrient concentration in chrysanthemum leaves under influence of solar radiation
¹Department of Horticultural Plant Nutrition , Poznan University of Life Sciences, Zgorzelecka4, 60-198 Poznań, Poland; e-mail: email@example.com
²Department of Ornamental Plants, Poznan University of Life Sciences,Dabrowskiego 159, 60-594 Poznań, Poland
Eleven pot cultivars of the chrysanthemum (Chrysanthemum x grandiflorum /Ramat./ Kitam.) were grown in 12 year-round cycles. Starting with 2 January 2002, on the second day of each successive month, rooted cuttings of all the chrysanthemum cultivars were planted into pots 14 cm in diameter, 5 cuttings per pot. From the day of potting, the plants were exposed to short-day treatment. In periods of naturally long days, the day was shortened to 10.5 hours. From November till mid-February (days under 10 hours), no supplementary assimilation light was used to improve the light conditions in the period of insolation deficit. Depending on weather conditions, the electrolytical conductivity of the nutrient solution used for plant feeding varied between 1.8 mS cm-1 (in summer) and 2.2 mS cm-1 (in winter). To prepare the nutrient solution rainwater was used. When 30% of inflorescences were in flower, for chemical analysis well-developed leaves from plants were sampled. The total concentrations of macro- and microelements in plant tissue were determined. To find the relationship between nutrient concentration in plant tissue and radiation, data were analysed using simple linear regression models. Radiation had an effect on nutrient concentration in chrysanthemum leaves. The highest determination coefficient R2 for P and Ca, the lowest for N and K were calculated.