Two open field experiments were conducted during summer seasons of 2019 and 2020, in a private farm at Abou El-Matamer district, Behiera Governorate, Egypt. Certified imported potato seeds of 'Cara' cv. were used after splitting-up. Cut seedy explants (ca. 40 g) contain two eyes each were planted at 0.80 m wide and 0.20 m apart between hills, using four concentrations of synthetic NAA auxin (control, 25, 50, and 100 mg l -1 ) and four concentrations of the synthetic cytokinin BA (control, 25, 50, and 100 mg l -1 ) were foliar applied separately and in combinations. Control plants were sprayed with distilled water. The effects of both variables and their combinations were investigated on the vegetative growth-related characters, yield and its components, leaves and tubers chemical composition. The obtained results declare, in general, that foliar application treatments of auxin (NAA) and cytokinin as BA alone or in combination to potato plants gave, significantly, the highest average values of both yield and chemical content compare to untreated plants. The combination between 100 mg l -1 NAA plus 100 mg l -1 BA might be considered as an optimal treatment for the production of high yield and good quality of potato plants under the environmental conditions of Behiera Governorate and other similar regions.

The experimental were conducted during the two successful summer seasons of 2019/2020 and 2020/2021, in a private farm, at Abu Al-Matamir city, Al-Behiera Governorate, Egypt, under open field condition, with surface irrigation system aiming to evaluate the response of potato tubers "Cara cultivar" to soaking before planting in "NAA" as auxin and synthetic cytokinin "CPPU" and the effects on vegetative growth, yield and its components and quality as well as the production of safe and economic potato tubers. The treatments comprising two times of soaking i.e., 5 and 10 min as main plot, three concentration treatments of (CPPU) as synthetic cytokinin i.e., 0.0, 5.0, 10.0 mg L -1 ) as sub plot and three levels of NAA as auxin (0, 5 and 10 mg L -1 ).The results indicated that soaking cut tuber explants before planting for 10 min in growth regulators solution was more superior for increasing vegetative growth parameters such as plant height, number of leaves and branches , yield (average tuber weight, number of tuber and total yield ton.fed -1 ), tuber quality (starch, TSS and total sugars %) and nutrition values in leaves and tubers (N, P and K%). Moreover, soaking in 10 mg L -1 CPPU mixed with 10 mg L -1 NAA for each of 5 or 10 min. increased all mentioned parameters. Generally, it could be concluded that soaking cut tuber explants of potato in 10 mg L -1 CPPU mixed with 10 mg L -1 NAA for 10 min before planting gave highest gross and economic yield of potato plants.

Two open field experiments were conducted during summer seasons of 2016 and 2017, in a private farm at Sedi Salem city, Kafr El-Sheikh Governorate, Egypt to investigate the effect of foliar application with sitofex CPPU, salicylic acid and their combinations on tomato growth, yield and chemical attributes. The 'Super Strain B F 1 hybrid' tomato cultivar , plants were treated with four concentrations of the synthetic cytokinin sitofex (0.00, 0.04, 0.08, and 0.12 mM) and four concentrations of SA (0.00, 1.00, 2.00 and 3.00 mM) were foliar applied separately and in combinations. Control plants were sprayed with tap water. Tomato plants were sprayed with the allocated or assigned treatments twice during the growing seasons, the first one at 10 days after transplanting and the second application was 35 days after the first one. The obtained results declare, in general, that foliar application treatments of cytokinin as sitofex and salicylic acid (SA) alone or in combination to tomato plants gave, significantly, the highest average values of vegetative growth, yield and chemical attributes compare to untreated plants. The combination between 0.12 mM CPPU plus 3.00 mM SA might be considered as an optimal treatment for the production of high yield and good quality of tomato fruits under the environmental conditions of Kafr El-Sheikh Governorate and other similar regions.