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Two field eхpеrimеnts were соnduсtеd аt the Experimental Farm, Faculty of Agriculture, Fayoum University at "Dar El-Ramad" Fayoum Governorate, Egypt during the summer growing seasons of 2019 and 2020. The main objective of this study was to determine the effect of sowing dates, ascorbic acid (vitamin C), zinc and their interaction on growth and yield of maize ( Zea mays L.). The experimental layout was a split- split plot arranged in randomized complete block design with three replications where sowing dates were considered as the main plot, ascorbic acid arranged in the sub plot and the sub-sub plot occupied by zinc foliar application treatments. Results indicated that sowing dates, ascorbic acid and zinc treatments hаd а signifiсаnt impасts оn yield and its attributes in the two seasons, except ear number per plant in two seasons and number of grains per row in the second season as well as 100 grain weight in the first season. Foliar spray of ascorbic acid treatments lеd tо signifiсаnt diffеrеnсеs in yield and its attributes i.e. number of ears/plant, ear length, ear dimeter, ear weight, number of row/ear, number of grains/row, ear grain weight, 100-grain weight and grain and biological yield/fed, as well as harvest index. The obtained data reveale also that the effect of zinc treatments on yield and its attributes was significant in the two seasons, except ear number per plant in two seasons and ear length in second season as well as number of grains/row in the first season. [ABSTRACT FROM AUTHOR]

For evaluating the response of growth and yield of lavender to ascorbic acid (0.0, 50, 100 and 150 ppm), nano-chitosan (0.0, 250, 500 and 750 ppm) and their interactions, an experiment was conducted at the Experimental Farm, Faculty of Agriculture, Zagazig University, Egypt, during the two consecutive summer seasons of 2018 and 2019. This experiment was arranged as split-plot experiment in the basis of completely randomized design with three replications. The main plots were occupied by four ascorbic acid concentrations, also, the sub plots were entitled to four nano-chitosan concentrations. Plant growth parameters as well as fresh and dry herb yield were recorded. Foliar spray with 150 ppm of ascorbic acid gave significantly higher values of growth and yield components compared to control and the other ones under study. Nano-chitosan at high concentrations (500 and 750 ppm) significantly increased all the investigated parameters compared to control. The best results were achieved by the interaction treatment between spraying with ascorbic acid at 100 ppm and nanochitosan at 750 ppm. This treatment could be used by the farmers under the same conditions because it has the most profitable rate and concentration with the greatest yield advantages. [ABSTRACT FROM AUTHOR]

An experiment was conducted during the winter season of each of 2015/2016 and 2016/ 2017 at the Experimental field, Faculty of Agriculture, Zagazig University, Egypt in order to evaluate the response of caraway growth and yield under three rates of N:P:K:Mg at 13:5:26:3 ratios/ (0.0, 2.0 and 4.0 g/l) as foliar spray and three types of antioxidants (Control, salicylic acid, vitamin C and vitamin B1 as well as their combinations). The experiment was applied by a split-plot in randomized complete block design (RCBD) arrangement with three replications. Results proved the superiority of chemical fertilization as foliar spray via enhancing yield components of caraway plants in comparing with no application. Salicylic acid (SA), vitamin B1 (Vitam.B) and vitamin C (Vitam.C) at 100 ppm of each applied three times/season showed the best results in most of the studied growth parameters (plant height, number of leaves and branches per plant, total dry weight, root dry weight and root length) and yield components (number of umbels per plant and fruit yield per plant and per faddan) as compared with control. Accordingly, this study recommends the possibility of using antioxidants treatment (SA+ Vitam.B + Vitam.C) as an improving growth performance and yield components of caraway plants under chemical fertilization rate at 2 g/l. [ABSTRACT FROM AUTHOR]