Regression Analysis of the Effect of Different N Doses in Calendula officinalis L.

Abstract

Abstract

The present study was conducted to investigate the effects of different nitrogen doses (0, 3, 6, 9 ve 12 kg/da) on flower yield and some yield parameters of pot marigold (Calendula officinalis L.) plants in 2015 under ecological conditions of Samsun province of Turkey. The first flower harvest was performed on 10th of July and 24 harvests were performed throughout the experiments. The greatest fresh and dry flower yields were obtained from 9 and 12 kg/da nitrogen treatments. The differences in essential oil contents of the treatments were not found to be significant. With regard to essential oil yields, calculated based on flower yield and essential oil content, 9 and 12 kg/da treatments were placed into the same statistical group. Resultant data were subjected to regression analysis. The effects of increasing nitrogen doses on fresh and dry flower yields were represented with second-order polynomial equations respectively as Y=–0.8587x²+20.556x+191.659 and Y=0.1354x²+3.3838x+32.524. The optimum doses to get maximum values were calculated by using these equations. Then, 9.73 kg/da was recommended for maximum number of flowers per plant, 11.97 kg/da for maximum fresh flower yield, 12.49 kg/da for maximum dry flower yield and 13.02 kg/da for maximum essential oil yield.

Keywords: Calendula officinalis L., fertilization, flower yield, essential oil

Cite this Article

Ömer Çalışkan, Dursun Kurt. Regression Analysis of the Effect of Different N Doses in Calendula officinalis L. Research & Reviews: Journal of Agricultural Science and Technology. 2017; 6(1): 15–19p.