The current research was conducted at Tissue Culture laboratory of Vegetables and Ornamental Dept., and greenhouse of Nematology Research Unit, Agricultural Zoology Dept., Faculty of Agriculture, Mansoura Univ., Egypt. The effect of certain components i.e. L-glutamic acid, ascorbic acid, yeast extract and phenylalanine introduced singly at 1 g/ L added to MS medium used for the growth of the carnation seeds, obtained from France before transplanting into plastic pots filled with sterilized loamy sandy soil on Meloidogyne incognita infection was evaluated under greenhouse conditions at 22±5°C. Results indicate that among tested treatments, application of L-glutamic acid gave the highest reduction percentage in M. incognita root galls by 57.14% while ascorbic acid ranked first in respect to eggmasses with value of 65.25%. However, Yeast extract exceeded other tested components in percentage increase of the whole plant fresh and shoot dry weights of the infected carnation seedlings and uninfected plants as well with values of 99.09 and 53.33%; and 55.96 and 211.8%, respectively. Thus, it could be concluded that yeast extract or L-glutamic acid applied in MS medium considered the best treatments in improving growth of carnation plants, increasing growth and suppressing M. incognita development and reproduction under greenhouse conditions.

A greenhouse experiment was conducted during two consecutive seasons of 2018/2019 and 2019/2020 at the Nursery of Ornamental plants, Faculty of Agriculture, Mansoura University, Egypt, to compare the ability of humic and fulvic acids solely at different concentrations (500,1000,1500 mg/l), besides the control on improving some vegetative, flowering parameters and chemical constituents of mums (Dendranthema grandiflorum 'Flyer'). The obtained results cleared that fulvic acid at concentrations of 1500 and 1000 mg/l or humic acid at 1500 mg/l were the most effective treatments for improving the vegetative parameters (plant height, branches number, plant spread, roots/shoots ratio, fresh and dry weights of plant, and leaf area), flowering parameters (days required period for appearing the first inflorescence and 50% of inflorescences, duration of flowering stage and the vase life, inflorescences number/plant, inflorescence diameter). Furthermore, drenching fulvic acid at 1500 and 1000 mg/l or humic acid at 1500 mg/l, promoted the photosynthesis pigments (total chlorophylls and carotenoids), in addition to the percentages of total carbohydrates, nitrogen, phosphorous and potassium in the leaves. Finally, it could be recommended to use fulvic acid at 1000 mg/l or humic acid at 1500 mg/l twice monthly (six times during the flowers production process) as a soil drench before the irrigation process for obtaining the ideal growth characteristics of this important pot and cut flower plant.

Two field experiments at (2016-2017) seasons were conducted to study the effect of lithovit at concentrations of 1 and 2 g/l for once, twice and thrice times application individually at 30 days interval to improve vegetative growth, flowering and chemical contents of Echinacea purpurea (L.) The obtained results showed that spraying Echinacea purpurea (L.) plants with lithovit at 2g/l for three times application in the form of foliar sprays at 30 days interval led to improve plant growth and yield characters expressed as plant height, number of leaves and flowers, fresh and dry weights of plant. Also, chemical constituents of N, P, K and total sugars%, phenol compound and photosynthetic pigments(total chlorophyll and carotenoids). Finally, it could be recommend to treat Echinacea purpurea (L.) plants by lithovit at the concentration 2g/l three times as foliar spray to achieve the best results regarding vegetative growth, flowering and chemical composition of plant under Egyptian conditions.

The chemical fertilizers caused many problems in our planet like soil and underground water pollution, beside the residuals of these fertilizers in the edible fruits or the ornamental plants. Thus, two seeds extract (moringa and fenugreek) were evaluated for their ability as biotic elicitors in the fertilization process of cineraria plants under different concentrations (0, 50, 75 and 100), each alone or in combinations on some vegetative growth, flowering parameters and chemical contents of this pot plant. Results cleared that combination between 50% MSE+ 75% FSE produced the shortest and compact plants. Moreover, the interaction between 75% MSE+ 50% FSE recorded the heaviest fresh and dry weights, reduced number of days for starting flowering and increased the inflorescence crown diameter. In addition, most of the highest concentration extracts between both 100% MSE + 100% FSE, 100% MSE + 75% FSE and 75% MSE + 100% FSE tabulated highest N and K% in cineraria leaves. Finally, using 50% MSE individually or in combination with 50% FSE enhanced the pigments content (total chlorophyll and carotenoids). Abbreviations; MSE (Moringa Seeds Extract) and FSE (Fenugreek Seeds Extract

This study was conducted during the 2019/2020 and 2020/2021 seasons at one of the agricultural nurseries in Dakahlia Governorate, Egypt to recognize how ground treatments and foliar application with some plant growth stimulants influenced the growth, chemical composition, and oil yield of Italian basil. The experimental plan for each ground treatment of vermicompost: clay soil at two rates (25:75 and 50:50%) (1:3 and 1:1v/v) in a separate experiment that used a randomized complete block design with four replications. Thirteen foliar spraying treatments using some plant growth stimulants were used as follows; control treatment, spraying plants with yeast extract at 2, 4, and 6 g/L, seaweed extract at 20, 40, and 60 %, chitosan at 500, 750, and 1000 ppm and vermicompost tea at 250, 500 and 750 ml/L. Growing Italian basil in media consisting of 25 % vermicompost: 75 % soil performed better than other media consisting of 50 % vermicompost: 50 % soil, which produced the highest values of all studied traits. The highest values of all studied traits were formed from foliar spraying Italian basil plants with chitosan at 750 ppm. It can be concluded that using growing media consists of 25 % vermicompost: 75 % clay soil in addition to foliar spraying Italian basil plants with chitosan at 750 ppm or vermicompost tea at 750 ml/L to enhance the growth and chemical composition and oil percentage of Italian basil (Ocimum basilicum L. var. Genovese) under the environmental conditions of Dakahlia Governorate, Egypt.