Effect of NPK, Aloe Gel and Moringa Extracts on Geranium Plants
The present work was carried out at the farm of the Medicinal and Aromatic Plants Department, El-Kanater El- Khaireya, Horticulture Research Institute, Agricultural Research Center, during the two successive seasons of 2013/2014 and 2014/2015. Cuttings of Pelargonium graveolens (15-20 cm long) were planted with 25 cm distance between them and 60 cm between rows. The treatments were arranged in split plot design, chemical fertilization (full dose of NPK consisted of 600 kg/fed ammonium sulphate (20.5% N); 300 kg/fed calcium super phosphate(15.5% P2O5) and 150 kg/fed potassium sulphate (48% K2O), half dose of NPK in addition to control without fertilization) occupied the main plots, while leaf extracts treatments (2, 4, 6 g moringa/l, as well as 25, 50 and 75 ml aloe gel extract /l in addition to control treatment without extract) were arranged in subplots. Plant height, number of branches/ plant, leaf area, leaves: stems fresh weight ratio, herb fresh and air dry weights, essential oil percentage in fresh herb and oil yield per plant were determined. The essential oil obtained in the two cuts of the second season was analyzed using DsChrom 6200 Gas Liquid Chromatography. Chlorophyll a, chlorophyll b and carotenoids in fresh leaves as well as total carbohydrates, nitrogen, phosphorus and potassium in dried herb were estimated. The most NPK effective rate was the full recommended dose. Extracts of moringa and aloe at 6g/l and 75ml/l, respectively resulted in a positive increase in vegetative growth, oil production and chemical composition. Full recommended rate of NPK chemical fertilizer combined with moringa leaf extract at 6g/l was the most effective treatment; it seems to be the recommended one under the experiment conditions, followed by combining full NPK dose with aloe gel extract at 75 ml/l.