Thesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Vegetable

This study was carried out during the two successive winter seasons 2011- 2012 and 2012- 2013 at sandy soil in a private sector farm at El-Dair village, Qalubia Governorate, Egypt, to investigate the effect of different nitrogen fertilizer levels and foliar spray with Humic acid at 2 l / fed., and Amica at 2 cm ³/ l apply every 15 days with a total of 5 application times during the growing season starting 21days after transplanting and every 15 days on vegetative growth, chemical constituents of plant foliage, fruit yield and quality of strawberry plants cv. Sweet Charlie. A split plot design with three replicates was used where different nitrogen fertilizer levels were arranged in the main plots and foliar spray treatments were arranged in sub plots. Obtained results show that soil addition of 100% of the recommended dose of NPK mineral fertilizers to strawberry plants combined with spraying the plants with Amica at 2 cm 3/ l are recommended to increase the vegetative growth, early maturing and total fruit yield. Moreover, compost at a rate of 100% of the recommended dose of NPK combined with spraying the plants with Amica result in obtaining the highest exportable yield with best quality. On the other hand, the second trail studied the effect of pre- harvest foliar spray with Humic acid and Amica as well as modified atmosphere of (16% O₂plus 20% CO₂) or vacuum packaging or chitosan at 1.5% and vapor gard at 0.1% as post-harvest treatment on the storability of strawberry fruits cv. Sweet Charlie during storage at 0{u00B0}C and 95% relative humidity

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