اعلانات هامة

Strawberry plants of Oso Grande variety has been treated with three types of foliar fertilizers containing ( Nitrogen, Boron, Manganese Jindividually and combined, in addition to treating some of them using Urea as soil fertilizer. Some plants were untreated to be used as a witness. Three concentrations were used as follows:

1- 2 g urea foliar/ m2, 200 mg B/ m2 200 mg Mn/ m2, 5 g urea/ m2

soil. 2- 4 g urea foliar/ m2, 400 mg B/ m2, 400 mg Mn/m2, 10 g urea/ m2

soil. 3- 6 g urea foliar/ m2, 600 mg B/m2, 600 mg Mn/m2, 15 g urea/ m2

soil.

The conducted study shows the following results:

-The total soluble material in the juice of strawberry fruits that were treated with manganese and with urea and manganese simultaneously were better than the control treatment and the plants which were treated with foliar urea. The total soluble material in the juice of strawberry fruits that were treated with manganese at the concentration of 600 mg Mn/m' outdid the plants that were treated with manganese at the concentration of 200 mg Mn /m2. Moreover, that ratio also proved to be better in the plants treated with (urea + manganese ) of concentration (3), 6 g urea foliar /m2 + 600 mg Mn/m2 significantly than those which were treated with concentration (2), foliar urea 4g urea foliar /m + 400 mg Mn/m'. The total soluble material in the juice of strawberry fruits that were treatedwith (urea+ boron + manganese) of concentration

 (3) significantly outdid that were treated with concentrations (1) & (2). The adjustable organic acids in the juice of strawberry fruits which were treated with (manganese) concentration (3) and which were also treated with (urea+ boron) outdid the ratio of the plants which were treated with (foliar urea). The adjustable organic acids ratio in the juice of strawberry fruits was the same in the plants which were treated with (urea + boron + manganese) of concentration (2), and was significantly better than its ratio in the plants which were treated with boron as well as those that were treated with boron + manganese ) and control plants.

The highest ascorbate value recorded was about 34 mg/100 g in the fruits after treating the plants with (2 g urea foliar/ m2 + 200 mg B/ m2 + 200 mg Mn/ m2), as well as in those that were treated with (600 mg B /m2 +600 mg Mn/ m2).

Key words: Fragaria ananassa, foliar fertilization, vitamin C, TSS, adjustable organic acids.

عوملت نباتات الفريز التابعة للصنف Oso Grande بثلاثة أنواع من الأسمدة الورقية التي تحتوي على (الآزوت أو البورون أو المنغنيز) بشكل منفرد وبشكل مشترك إضافة إلى معاملة بعضها باليوريا سمادا أرضيا، وتركت نباتات أخرى شاهدا ، حيث أستعملت ثلاثة تراكيز من الأسمدة على النحو التالي :