Effect of Organic and Mineral Nitrogen Fertilization and Some Growth Stimulants on Productivity of Strawberry for Exportation

Two field experiments were carried out during the two successive seasons of 2017/2018 and 2018/2019 in El-kanater Horticulture Research Station, Kalubiya Governorate, to investigate the effect of organic or mineral nitrogen fertilization levels with soil addition of humic acid, EM and TS as well as the foliar spray with some growth stimulants (Phosphrin, Micoind an Orset-x) on vegetative growth, chemical composition, fruit yield and its quality of strawberry plants (Fragaria X ananassa Duch) cv. Fortuna. This experiments included 16 treatments resulted from the combinations of four Nitrogen fertilizer treatments and four spray treatments as follows, 50% compost- N + 50% mineral-N fertilizers +EM, 50% compost –N + 50% mineral-N fertilizers +TS,  50% compost –N + 50% mineral-N fertilizers + humic acid and 100% mineral N fertilizer at a rate of 200 kg N/fed as recommended dose. Meanwhile, foliar spray treatments, Phosphrin at 5ml/l, Micoind at 2g/l, Orset-X at 1g/l and control (sprayed only with tap water). Obtained results showed that, the application of the recommended dose of nitrogen fertilizer (200kg N/fed) in form of 50% compost +50%mineral N +TS combined with foliar spray with Phosphrin at 5ml/l gave the highest vegetative growth parameters, chemical constituents of plant foliage, fruit yield and its components (early, exportable, marketable and total yield per plant and per fed) and best physical and chemical fruit quality.