الفهرس 
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Abstract
This study was carried out in the Farm of strawberry Improvement Center, Ismailia Governorate, Egypt and Laboratory of strawberry and Non-Traditional Crops Improvement Center, Faculty of Agriculture, Ain Shams University, with cooperation with ” the Project Micronutrients and Other Plant Nutrition Problems ” Fertilization Technology Department, National Research Centre (NRC) Dokki, Cairo, Egypt, during two successive seasons of 2006/2007 and 2007/2008. br The aim of this study was to examine the response of yield and quality of some strawberry cultivars to foliar application of different Fe sources (Fe-EDTA and FeSO4. 7H2O) at different plant growth stages. br field Experiment with fresh planting system included three strawberry cultivars (Festival, Camarosa , Sweet charlie) cultivated on beds with 120 cm width, 50 meters length and 50 cm height; the plants distance was 25 cm between plants and 30 cm between rows (four rows each bed). Planting dates were 27th and 20th of September in two tested years respectively. Two different Fe sources (Fe-EDTA and FeSO4. 7H2O) were foliar sprayed at 3 growth stages (before blooming, 2 weeks after blooming and in the middle of the fruiting) and four concentrations -#102;-#114;-#111;-#109; both Fe sources (0, 130 - 260 - 520 ppm). br A split split plot design was applied the strawberry cultivars were planted in main plots, Fe sources were applied to sub plots and Fe concentrations were applied to sub sub plots. Each treatment was distributed in randomly in 3 replicates. Data were statistical analyzed using combined analysis for two seasons 2006/2007 and 2007/2008. br The obtained results could be summarized as follows: br A-Vegetative growth characteristics: br 1. The highest vegetative growth expressed as leaves number, plant length, leaf area, fresh and dry weight per plant were obtained by growing plants -#102;-#114;-#111;-#109; Camarosa cultivar. br 2. Iron forms had significant effect on plant growth characteristics, -#119;-#104;-#101;-#114;-#101; by the highest values were recorded with iron chelated. br 3. There were gradual increments in leaves number, plant length, leaf area, fresh and dry weight per plant with increasing iron level. br 4. The interaction between cultivars and Fe sources was significant on growth characteristics. Camarosa cultivar when sprayed with iron chelated gave the highest values -#102;-#114;-#111;-#109; plant length; leaf area, fresh and dry weight per plant while the highest leaves number were obtained by Sweet charlie cultivar when sprayed with iron cheated. br 5- The interaction between cultivars and Fe concentrations greatly affects growth characteristics. Camarosa cultivar sprayed with 520 ppm Fe concentration gave the highest values of plant growth characteristics except leaves number surprised under Sweet charlie with 520 ppm Fe concentration. br 6- The interaction between Fe sources and Fe concentrations revealed that the highest level of iron chelated produced plants with the highest growth values. br 7- The interaction among cultivars, iron sources and Fe concentrations, appeared that Camarosa cultivar when sprayed with 520 ppm iron chelated, in general, produced plants with the highest growth values, i.e., tallest plant length, highest leaf area, the heaviest fresh and dry weight of plants while, most vigorous leaf number obtained by Sweet charlie cultivar sprayed with 520 ppm iron chelated. br B- Yield Components br 1- Sweet charlie cultivar gave earliest fruit yield and the highest number of fruit per plant compared other cultivars also, Camarosa and Sweet charlie gave the highest total yield per plant. br 2- Using iron chelated form significantly increased the total yield and number of fruit per plant as compared with mineral one but no significant differences between chelated form and mineral in terms of early yield. br 3- The values of early yield, total yield and number of fruit per plant increased as iron level increased. br 4- The interaction between cultivars and iron sources on yield studied traits was significant whereby the highest values were found with Sweet charlie and Camarosa cultivars sprayed with iron chelated form. br 5- The interaction between cultivars and iron concentrations on yield components was significant whereby the highest values were found with Sweet charlie cultivar sprayed with iron at 520 ppm as early yield and number of fruit also; Camarosa when sprayed with the same concentration gave the highest total yield. br 6- The interaction between iron sources and concentrations was significant of yield components. The highest value was obtained by plants sprayed with 520 ppm iron chelated. br 7- The highest early yield, total yield and number of fruit were obtained by Sweet charlie cultivar when sprayed with 520 ppm iron chelated also; Camarosa cultivar gave the highest values of total yield and number of fruit when sprayed with 520 ppm iron chelated. br C- Chemical characteristics of leaves br 1-Chemical characteristics of leaves, expressed as chlorophyll content and active iron were the highest by the Sweet charlie cultivar. br 2-Iron chelated gave the highest value of chlorophyll content compared mineral one while no significant difference between iron chelated and mineral one in terms active iron was found. br 3- The values of chlorophyll content and active iron increased as iron level increased (520 ppm). br 4. The interaction between cultivars and iron sources on chlorophyll content and active iron studied traits was significant whereas, the highest values were found at Sweet charlie when sprayed with iron -#102;-#114;-#111;-#109; two forms. br 5. The interaction between cultivars and iron concentrations was significant in the combined of two seasons in terms of chlorophyll content and active iron. The highest value was obtained by Sweet charlie sprayed with 520 ppm concentration. br 6- As for the interaction between iron sources and concentrations, there was a significant and gradual increment in chlorophyll content and active iron with increasing iron level -#102;-#114;-#111;-#109; two forms. br 7- The interaction between Cv. Sweet charlie and high iron level -#102;-#114;-#111;-#109; two sources showed the highest values of chlorophyll content and active iron. br D. Mineral content of aerial part. br 1. The highest nitrogen, potassium, magnesium, iron and cupper content in aerial part were recorded by Sweet charlie cultivar, while Camarosa cultivar surprised in its phosphorus, calcium, manganese and zinc content. br 2- Nitrogen, phosphorus, potassium, calcium, magnesium, iron, manganese, zinc, and cupper content -#102;-#114;-#111;-#109; chelated form surpassed mineral one. br 3- There was a significant and gradual increment in nitrogen, phosphorus, potassium, magnesium, iron, zinc and cupper contents with increasing iron concentration (520 ppm iron concentration) while, the highest calcium and manganese contents were obtained by 130 ppm iron concentration. br 4- The interaction between Sweet charlie cultivar and iron chelated form surprised in its N, P, K, Mg, Fe and Cu content while, Camarosa cultivar gave the highest Ca, Mn and Zn content when sprayed with iron chelated form. br 5- The interaction between Camarosa cultivar and 520 ppm iron concentration gave the highest, P, K, Mg, Zn and Cu content also, N and Fe content -#102;-#114;-#111;-#109; Sweet charlie cultivar under the same iron level while, Camarosa cultivar surprised in its Ca, Mn content when sprayed with 130 ppm iron concentration. br 6- Strawberry plants sprayed with iron chelated at 520 ppm concentration gave the highest Nitrogen, phosphorus, potassium, magnesium, iron, zinc, and cupper content while, the highest calcium and manganese content product by 130 ppm iron concentration -#102;-#114;-#111;-#109; the same iron form. br 7- The interaction among Sweet charlie cultivar, iron chelated form and 520 ppm iron concentration gave the highest K, Mg, Fe and Cu content also, the highest N and Zn content -#102;-#114;-#111;-#109; Camarosa cultivar under the same iron form and level; as P content under mineral form while, Camarosa cultivar surprised in its Ca, Mn content when sprayed with 130 ppm iron chelated. br E- Physical characteristics of fruits: br 1- Physical characteristics of fruits, expressed as fruit weight and firmness were the highest by the Camarosa cultivar. br 2-Iron chelated gave the highest value of fruit weight compared mineral one while, no significant difference between iron chelated and mineral one in terms fruit firmness was found. br 3- The values of fruit weight increased as iron level increased (520 ppm) while, no significant difference between iron concentrations in terms of fruit firmness. br 4. The interaction between cultivars and iron sources on fruit weight and firmness studied traits was significant whereas by the highest values were found in Camarosa when sprayed with iron chelated form. br 5. The interaction between cultivars and iron concentrations was significant in terms of fruit weight and firmness. The highest value was obtained by Camarosa cultivar sprayed with 520 ppm concentration. br 6- As for the interaction between iron sources and concentrations, there was a significant and gradual increment in fruit weight with increasing iron level -#102;-#114;-#111;-#109; chelated form. br 7- Camarosa cv. with high iron level -#102;-#114;-#111;-#109; chelated form gave the highest values of fruit weight and firmness. br F- Chemical characteristics of fruits br 1-Sweet charlie cultivar surprised than the other cultivars of TSS, TSS/TA, sugar and anthocyanin contents while, Festival cultivar gave the highest total acidity and vitamin C. content. br 2- TSS, total acidity, sugar and vitamin C contents -#102;-#114;-#111;-#109; chelated form surpassed mineral one. Also, Fe-mineral form gave the highest TSS/TA content while, iron forms no significant difference in terms of anthocyanin content. br 3- The highest Fe-concentration (520 ppm) gave the highest TSS, total acidity, sugar, vitamin C. and anthocyanin contents while, TSS/TA significant decreased by increasing Fe-concentration. br 4. The interaction between cultivars and iron sources on TSS, TSS/TA, sugar and anthocyanin contents was significant. The highest values were found in Sweet charlie when sprayed with iron chelated form while, Festival cultivar surprised in its acidity and vitamin C. content when sprayed with iron chelated. br 5- The interaction between Sweet charlie cultivar and high iron level gave the highest values of sugar and anthocyanin contents. Also, Camarosa cultivar surprised in its TSS content and also Festival cultivar gave the greatest acidity and vitamin C. contents under the same iron concentration while, the highest TSS/TA content obtained by Sweet charlie cultivar without sprayed with iron (control). br 6- The highest TSS, acidity, sugar and vitamin C. contents obtained by the highest Fe-chelated concentration (520 ppm) also, iron mineral gave the highest anthocyanin when sprayed with the same iron level while, the TSS/TA decreased by increasing iron level. br 7- The interaction among cultivars, iron sources and iron concentrations was significant. The highest values of sugar and anthocyanin contents obtained by Sweet charlie sprayed with the higher Fe-chelated concentration (520 ppm) Also, Camarosa cultivar surprised in its TSS content and also Festival cultivar gave the greatest acidity and vitamin C. content under the same iron form and concentration while, the highest TSS/TA content obtained by Sweet charlie cultivar without sprayed with iron (control). br Conclusion br It could be concluded that all studied strawberry cultivars i.e. Camarosa, Sweet charlie and Festival need to be sprayed with iron as complementary treatments to get the most economic yield and the best quality. Also, all cultivars could be positively responsed to either chelated or mineral iron forms. However, chelated form is preferable, because its effect on yield and quality was much better than mineral one. Also, the highest Fe concentration (520 ppm) gave the best yield and quality of strawberry plants.