الفهرس 
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Abstract
Feverfew (Tanacetum parthenium L.) is one of the medicinal and aromatic plants belonging to the Asteraceae family, which has many pharmacological and therapeutic properties.So, two pot trials were conducted at the Experimental Farm of Medicinal and Aromatic Plants, Fac. Agric., Mansoura Univ., Egypt during winter seasons of 2018 and 2019 to study the response of feverfew plants to different planting dates (1st, 15th and 30th December), addition of compost at various rates (0, 22, 33 and 44 g / pot) and foliar spraying with amino acids i.e., glycine and tryptophan at rate of 1.0 g l-1under sandy soil condition.Thirty-six treatments, which were the simple possible combination between three planting dates, four compost levels and three foliar applications) were arranged in a split-split-plot. The planting dates represented the main plots and compost treatments were devoted in sub-plots while the foliar applications were allocated in the sub-sub-plots. Each treatment was replicated three times. Thus, the total number of pots used for each season was 108 pots. To carry out the experiment, plastic pots (30 cm diameter and 40 cm depth) were filled with air-dry soils (equaled to 15 kg) that contained peat moss and sand with a ratio of 3:1 after performing a soil leaching process to get rid of salts. Seeds were sown on 15th Sep, 30th Sep and 15th October, and were transplanted on 1st Dec, 15th Dec and 30th Dec, respectively. Two uniform feverfew seedlings (75 days old and its height was from 10 to 15 cm) were transplanted carefully on above-mentioned dates in both seasons of the studyand were thinned to one plant per pot after 30 days from transplanting.Mineral fertilizer (20N: 20P: 20K) were obtained from El- Delta Company for Fertilizers and Chemical Industries (ASMEDA), Egypt. The amount of chemical fertilizer was divided to ten equal doses (each dose was 2g pot-1). The first dose was added after 20 days from transplanting and repeated each two weeks interval.Irrigation was carried out every 2 days to reach the soil field capacity by weight. Vegetative growth criteria i.e., fresh and dry weights, plant height and No. of branches, chemical traits i.e. N, P, K,total carbohydrate, chlorophyll and carotene content as well as essential oil percentage were determined. The obtained results could be summarized as follows: A- Vegetative Growth Criteria: 1-Herb fresh and dry weights (g /plant-1). Feverfew plants recorded the highest values of fresh and dry weights when they transplanted on 15th Dec in pots contained 44g compost with foliar application of glycine at rate of 1.0 g l-1. While, the lowest values wererecorded with feverfew plants transplanted on 30th Dec without both compost and amino acidsduring the both seasons of the experimentation. 2. Plant height (cm) and number of branches plant-1. The combination of 15th Dec as transplanting date + 44g compost pot-1 + glycine at rate of 1.0 g l-1 resulted in significant increase in the plant height (cm) and number of branches plant-1 of feverfew plants over all other combined treatments.While, the lowest values were recorded with control plants transplanted on 30th Dec. without compost and amino acids. B-Inflorescences Parameters: Plants gave the highest values of number of inflorescences plant-1, freshand dry weights of inflorescences (g plant-1)when feverfew were planted on 15th Dec in pots contained 44g compost with foliar application of glycine at rate of 1.0 g l-1. While, the lowest values of all aforementioned traits was recorded with plants transplanted on 30th Dec without compost and amino acidsduring the both seasons of the experimentation. C- Essential Oil Production: Going along with combination treatments among planting dates, compost levels and amino acids, it was obviousthat combination of 15th Dec as transplanting date + 44.0 g compost pot-1 + glycine at rate of 1.0 g l-1 resulted in significant increase in theessential oil (%) of feverfew plants over all other combined treatments. While, the lowest values of essential oil (%) was recorded with plants transplanted on 30th Dec without compost and amino acids. GLC separation of feverfew essential oil revealed 12 identified components (α-pinene, camphene,β-pinene, p- cymene,chrysanthene, camphor, pinocarvone, borneol, bornyl acetate, eugenol, β-caryophyllen and germacrene).The main components of feverfew oil were chrysanthene, camphor and bornylacetate which achieved the largest values with the planting dates 15th Dec. + spraying with glycine amino acid. D- Chemical Constituents: 1- Total Nitrogen, total phosphorus and potassium,percentages. The comparison among the various combined treatments of planting dates, compost levels and amino acids has been reflected significant differences between the values of N, P and K (%) in the leaves of feverfew during both seasons of the experimentation. The maximum N, P and K were recorded with the combinationof 15th Dec as planting date × addition of 44g compost pot-1× foliar application of glycine. While the lowest values of N , Pand K were realized under the combination of 30th Dec as planting date × without compost × foliar application of tap water. 2- Photosynthetic contents. Concerning the interaction effect among the investigated treatments, it was obvious that feverfew plants recorded the highest values of photosynthetic pigments i.e. chlorophyll a, b, total chlorophyll and carotene (mg g-1 F.W) when they were transplanted on 15th Dec in pots contained 44g compost with foliar application of glycine at rate of 1.0 g l-1. While, the lowest values of photosynthetic pigment i.e. chlorophyll a, b, total chlorophyll and carotene (mg g-1 F.W) were recorded with feverfew plants transplanted on 30th Dec without both compost and amino acids. 3- Total carbohydrates (%). The comparison among the various combined treatments of planting dates, compost levels and amino acids has been reflected significant differences between the values of total carbohydrates (%) in leaves of feverfew plants during both seasons of the experimentation. The maximum total carbohydrates were recorded with the combination of 15th Dec as planting date × addition of 44g compost pot-1× foliar application of glycine. While the lowest values of total carbohydrates were realized under the combination of 30th Dec as planting date × without compost × foliar application of tap water. CONCLUSION This investigation reflects the perceptive influence of planting date, compost additions and foliar applications of amino acids onfeverfew plants. According to the obtained results, we could be recommended thatfeverfew plants transplanted on 15th Dec in pots contained 15 kg of sandy soil mixed with 44g compost and sprayed with glycine at rate of 1.0 g L-1 as a best combined treatment that could be recommended to enhance growth performance of feverfew (Tanacetum parthenium L.) plants and obtain the highest essential oil percentage and components.