Foliar application of mineral nutrients considers a method of supplying nutrients to higher plants more rapidly than methods involving root application, which makes the nutrients more efficient. It is a quick and efficient method of supplying micro elements in particular. It can, also be used to satisfy acute needs of macro nutrients. This study was conducted on garlic cv. Sids-40, in the privet farm at Kafr Meet Faris village, near El-Mansoura, Dakahlia Governorate, during 2008/2009 and 2009/2010 seasons to study the effect of foliar application with certain magnesium concentrations (0.0%, 0.2%, 0.4% and 0.6% as Mg-citrate) either single and/or in combination with foliar application of some yeast extract concentrations (0.0, 25 ml/L, 50 ml/L and 100 ml/L) on plant growth, yield and its components, as well as chemical constituents and storability of bulbs during the storage period. The obtained results could be summarized as follows: In general, results showed that the plants sprayed with Mg-concentrations were better than those of the unsprayed ones. Increasing the foliar applied magnesium concentration from 0.2% to 0.6% Mg significantly increased plant height, number of leaves/plant, plant dry weight and bulbing ratio as well as total yield and bulb weight and diameter. Moreover, foliar application of magnesium at 0.6% Mg significantly increased concentrations of N, P and K in cloves. In addition, TSS% and volatile oils were increased. This concentration had the most interesting observation in the enhancing of storability. On the other hand, foliar application of yeast extract at 50 ml/L gave rise to significant increases in plant height, number of leaves/plant; plant dry weight, bulbing ratio, total yield, bulb weight and diameter and clove weight as well as chemical constituents in cloves and decreasing bulb weight loss percentage during the storage period compared with the other treatments. The combined treatments of Mg-concentrations and yeast extract were generally more effective on the most studied parameters than single ones. The best results were obtained by foliar application of 0.6% Mg with foliar application of yeast extract at 50 ml/L. This treatment achieved increases in yield at the end of the storage period reached to 18.20% and 18.80% in the first and second seasons, respectively compared with the untreated ones. Therefore, this treatment could be recommended for raising garlic yield and improving bulb quality during the storage period under similar conditions to this work.

Two field experiments were conducted on sweet potato (Ipomoea batatas L.) cv. Beaure Gard at the Horticulture Research Farm of El-Bramoon, El-Dakahlia Governorate, during the two successive summer seasons of 2007 and 2008 to evaluate the effects of different rates of phosphorus (15, 30 and 45 kg P2O5/fed) either single and/or in combination with application methods of humic acid (control, foliar spray, transplant treatment and soil application) on plant growth, yield and its components, as well as chemical constituents and storability of tuber roots. In general, results showed that the increasing of applied phosphorus rate from 15 kg P2O5 up to 45 kg P2O5/fed significantly increased main stem length, canopy dry weight plant leaf area, total chlorophyll and carotenoides as well as total and marketable yield, dry matter percentage of tuber root and tuber root weight and diameter, Moreover, Application phosphorus at 45 kg P2O5/fed significantly increased N, P, K, carbohydrate and total sugars in tuber roots. This P-rate had the most interesting observation was the enhancing of storability and reduced decay percentage. On the other hand, application methods of humic acid had a significant effect on all studied characters in both seasons. Soil application method of humic acid had a significant increases in plant growth characters, photosynthetic pigments, total and marketable yield and tuber root quality. Besides, this application method significantly increased chemical composition of tuber roots and reduced the weight loss and decay percentages. The combined treatments of P-rates and application method of humic acid were generally more effective on the most studied parameters than with single ones. The best results were obtained by application 30 kg P2O5/fed with soil application method of humic acid. This treatment achieved increases in vegetative growth characters, total and marketable yield, average of tuber root weight and diameter as well as concentrations of N, P, K, carbohydrate and total sugars in tuber roots. In addition, this combined treatment enhanced the tuberous roots storability and reduced decay% comparing with the other ones. Therefore, this treatment could be recommended for raising sweet potato yield and improving tuberous roots quality as well as reduced the need for chemical Pfertilizer by about 33.3 %, thereby reducing costs and environment pollution under similar conditions to this work.

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Two field trials were conducted on potato plants cv. Spunta, in the vegetable private farm at Kafr Meet Faris, Dakahlia Governorate, during two winter seasons of 2017/2018 and 2018/2019 to study the influence of foliar spray with calcium (0, 1000, 1500 and 2000 ppm) and some antioxidants (control, Ascorbic acid at 300 ppm, boric acid at 100 ppm and Salicylic acid at 50 ppm) in additions to their interaction on plant growth, yield and its components as well as chemical constituents in tuber.In general, all the studied characteristics were better in plants sprayed calcium compared with the control treatment. Plant length, number of main stems/plant, number of leaves/plant, leaf area and foliage dry weight/plant, total tubers yield, marketable tubers yield, tuber dry weight, the tuber content of N, P, K, starch and TSS were increased with increasing calcium level up to 2000 ppm.Foliar spray with antioxidants led to significant increases of the vegetative growth characteristics and enhanced total yield and its components as well as chemical constituents in tuber. Foliar spray with boric acid at 100 ppm have the highest records in all studied characteristics followed by Salicylic acid in both seasons.The positive interactions between foliar spray calcium levels and foliar spray with antioxidants were often observed.The best results were obtained by plants sprayed calcium at the level of 2000 ppm and boric acid followed by Salicylic acid.Therefore, this treatment could be recommended for raising potato yield and improving tuber quality of potato under such conditions of this study.