Two field experiments were carried out during two successive summer seasons of 2009 and 2010 at the experimental farm, El-Kassasein Research Station, Ismailia Governorate, to investigate the effect of different rates of nitrogen and potassium fertilization (100%, 75% and 50% of the recommended dose) and foliar application with urea and citrate potassium at rates of 0.05 and 1 % and their interactions on plant growth, fresh and dry weight, yield and its components and chemical constituents of Jerusalem artichoke plants (Helianthus tuberosus L.) cv. fuseau under sandy soil conditions. Fertilization with 100% of nitrogen and potassium from the recommended dose recorded maximum values of plant height, number of shoots / plant both fresh and dry weight/plants, yield and its components, and chemical constituents of tubers in both seasons. Spraying Jerusalem artichoke plants with urea and citrate potassium at a rate of 1% significantly increased plant growth, yield and its components as well as chemical constituents of tubers. In general, the best interaction treatment among different rates of nitrogen and potassium fertilization and foliar application with urea and citrate potassium was fertilization with 100% of the recommended dose and foliar application with urea and citrate potassium at a rate of 1% as compared with other treatments.

The present work was carried at Baramoon Experimental Farm, Dakhalia Governorate, Egypt, during the two spring seasons of 2004 and 2005. Potatoes cv. Spunta was cultivated to study the effect of glycine, lysine and nitrogen fertilizer rates on growth, yield and chemical composition of potato , i.e., (control, glycine at dose 100 ppm, lysine at dose 100 ppm, a mixture of glycine 100 ppm plus lysine 100 ppm) and nitrogen rates of 120, 150 and 180 kg/fed.The results showed that nitrogen fertilizers rates increased significantly vegetative growth parameters, i.e., plant height, number of main stems, foliage fresh and dry weight at 75 days after planting, in addition to total tuber yield, tuber number, tuber weight/plant, NPK in leaves at 75 days after planting and P, dry matter, starch, protein contents in the tubers in two seasons.The best growth parameters of potatoes were recorded with foliar addition of glycine plus lysine each at 100 ppm. The highest total tuber yield, tuber number, tuber weight, NPK in the leaves at 75 days after planting and tuber at harvest time, dry matter, starch as well as protein content in the tuber were obtained by glycine plus lysine treatment in both seasons.The interaction between N fertilizer rates and amino acid, had significant effect on all vegetative growth parameters, total tuber yield and its components, NPK in the leaves and tubers, dry matter, starch and protein contents in the tubers except N in the first season.

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This study was carried out for two successive seasons (2013&2014) in a private vineyard located at Aga-Dakahlia Governrate to evaluate the efficiency of some new alternatives on dormancy breaking of Flame Seedless grapevines. The chosen vines were 5 years old, grown in a clay loam soil, spaced at 2x2.5m , irrigated by flood irrigation system .The vines were pruned during the second week of January for the two seasons of the study to obtain bud load of 72 buds/vine (6 canes x 12 buds/cane)and sprayed on the third week of January by phosphoric acid 2%, sulphoric acid 2%, potassium nitrate 5%, potassium hydroxid 1%, zinc sulfate3%, urea10%, H2O2 1%, dormex 4% and mineral oil7%. The result show that all treatments hastened the beginning of bud burst and significantly shortened the duration of bud burst rather than the control treatment. Dormex at 4% was most effective as it gave about 95% bud burst.