Influence of biostimulants and bio-fertilizers on sterculia brachychyton rupestris seedlings under saline water irrigation /
تأثير المنشطات و الأسمدة الحيوية على شتلات الاستركوليا (Brachychiton rupestris) تحت ظروف الري بالمياه المالحة
by Enas Ali Youssef ElShereef ; Supervisors Dr. Mona Ahmed Darwish, Dr. Asmaa AlAttar, Dr. Fatma El-Nabawia Mohamed El-Quesni, Dr. Samah Mostafa El-Sayed.
- 208 pages : illustrations ; 25 cm. + CD.
Thesis (Ph.D)-Cairo University, 2025.
Bibliography: pages 189-208.
This study was carried out in the Experimental Nursery of Ornamental Horticulture Department, Faculty of Agriculture, Cairo University, and Ornamental Plants and Woody Trees Dept., National Research Centre, Egypt. During two successive seasons (2018 and 2019) to evaluate the enhancement effect of some biostimulants (dry garlic cloves extract DGCE and moringa leaves extract MLE) and some biofertilizers (yeast extract Y and seaweed extract SW) on Brachychiton rupestris seedlings as stressed by saline water irrigation (SWI) at concentrations of (0, 3000, 6000 and 9000 ppm).The recorded results of B. rupestris showed that using salinity at different concentrations decreased all growth parameters, photosynthetic pigments and also decreased NPK in leaves, but increased (proline content, total phenol content, total flavonoids , Na %, Cl% content). Using bio- stimulant treatments had a stimulant effect on B. rupestris especially moringa leaves extract treatment at the rate of 6% which increased most vegetative and chemical characteristics (plant height, stem diameter in the 2nd season, No. of leaves/plant, leaves fresh and dry weight and Chl. a & b, N% in leaves and roots and increased K% in leaves) and decreased (proline content, Na% in leaves and roots also decreased Cl% in leaves). While using 5%DGCE gave the highest values in (root and stem parameters, and P% in leaves,). Also the treatment of moringa leaves extract at the rate of 6% had an enhancement effect on B. rupestris seedlings grown under 3000 ppm SWI, that it gave the highest values in (plant height, No. of leaves/ plant, fresh and dry weight of leaves, Chl. a & Chl. b, N% in leaves and roots and gave the highest values of K% in leaves) and decreased proline content. Using 5% DGCE +3000 ppm SWI gave the highest values in (stem diameter, stem fresh and dry weight and gave the highest values for P% content in leaves), using 6% MLE + control SWI gave the decreased Na % and Cl% content in leaves. As for the 2nd experiment using SWI had the same effect on plant's growth parameters and chemical constituents, as for using Bio-fertilizer treatments results showed that spraying with 10% Y increased all growth parameters, photosynthetic pigments, total flavonoids and N% in leaves and roots, and increased P% in leaves .Also the treatment of Yeast extract at the rate of 10% an enhancement effect on B. rupestris seedlings grown under 3000 ppm, that it gave the highest values for (most growth parameters, photosynthetic pigments, also recorded the highest values, N% in leaves and P% in leaves), while using 10% Y+ control SWI gave the highest values in (roots fresh and dry weight, decreased proline content and decreased Na% in both leaves and roots). أُجريت الدراسة لتقييم تأثير بعض المنشطات الحيوية (الثوم، المورينغا) والأسمدة الحيوية (الخميرة، الطحالب) على شتلات الاستركوليا روبسترس تحت الري بالمياه المالحة بتراكيزات (0، 3000، 6000، 9000 جزء في المليون). أدت الملوحة إلى انخفاض النمو والأصباغ والنيتروجين والفوسفور والبوتاسيوم، وزيادة البرولين والفينولات والفلافونويدات والصوديوم والكلوريد. أظهر مستخلص المورينغا (6%) أفضل تأثير محفز لمعظم الصفات الخضرية والكيميائية وخفض البرولين والصوديوم والكلوريد.أظهر مستخلص الخميرة (10%) تحسينًا واضحًا في النمو والأصباغ والعناصر الغذائية وخفض البرولين و الصوديوم