Morphophysiological and nutrient uptake characteristics of marigold (Tagetes spp) under different levels of nitrogen fertilization

Abstract

The growth and morpho physiological parameters of marigold plants were evaluated under different nitrogen (N) fertilization during spring and summer of 2014 using pot experiment. A soil with no cultivation background and low level of nitrogen was used for plant cultivation. Nitrogen from urea and at four levels of 0 (control), 50, 100, 200mgNkg-1 soil was applied and incorporated into the pot soil before and after transplanting. The results showed that marigold overall growth was improved by nitrogen fertilization; however N50 had no significant effect on plant growth compared to control. Nitrogen levels of N100 and N200 were significantly improved plant growth and quality parameters. The plant fresh and dry weight, and flower fresh weight were significantly improved by N100 and N200 treatments, however for most traits there was no significant difference between N100 and N200 levels. Leaf Mg and Ca concentrations as well as flower longevity on plant were highest in N100 treatment, while Fe and Zn were highest in N200 treatment. Therefore considering the negative environmental effects of N fertilization, it is vise indicated from the results to use moderate N level for optimum marigold growth and flower quality characteristics.