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العنوان
RESPONSE OF MANGO TREES TO APPLICATION OF MAGNETITE, NATURAL MIXTURE COMPOUND AND SELENIUM UNDER DRIP IRRIGATION SYSTEM IN SANDY SOIL/
المؤلف
MOHAMED, SHAIMAA MOHAMED MOHAMED.
هيئة الاعداد
باحث / SHAIMAA MOHAMED MOHAMED MOHAMED
مشرف / . Mohamed Abdel –Wahab Khamis
مشرف / Ibrahim Shawky El-Sayed
مشرف / Hassan Mohamed Fadel El-Wakeel
تاريخ النشر
2017.
عدد الصفحات
165 p. :
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
البساتين
تاريخ الإجازة
1/1/2017
مكان الإجازة
جامعة عين شمس - كلية الزراعة - البساتين
الفهرس
Only 14 pages are availabe for public view

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from 165

Abstract

This study was carried out during two successive years, 2013 and 2014 on seven years old mango trees (Mangifera indica L) Keitt cv. budded on seedling rootstock planted at 2.5 x 2.5 m in a sandy soil under drip irrigation system. This study included two experiments as follows:
The first experiment:
Effect of magnetite soil application and selenium foliar spray on Keitt mango trees grown under drip irrigation system in sandy soil.
This experiment aimed to study the effect of three magnetite (Mag.) levels (0, 125 and 250 g./tree /year) as soil application once in winter (mid January) and four concentration of selenium (Se) (0, 5, 10 and 20 ppm) as foliar spray once at the end of February on the vegetative growth, yield, fruit quality, leaf and fruit mineral content. The experiment was arranged as a factorial experiment in a randomize complete block design with four replicates each of one tree.
The obtained results could be summarized as follow:
1-1- Vegetative growth:
Shoot length and Shoot number recorded the highest values by treatment (magnetite soil application at 250 g/tree followed by foliar spray with selenium at 5 ppm). Leaf number and leaf area showed inconstant trend in both seasons.
1-2- Tree yield:
Yield as number and weight of fruits per tree was the highest by treatment (250 g/tree magnetite as soil application followed by selenium spray at 5 ppm).
1-3- Fruit quality:
1-3- 1- Physical properties:
Treatment (250 g/tree magnetite soil application followed by 5 ppm selenium spray) gave the highest values of weight, volume, pulp (weight and percentage), length and width of fruit. The lowest seed weight was recorded by the control treatment. Peel weight showed inconstant trend in both seasons.
1-3-2- Chemical properties:
The highest values of total soluble solids in fruit juice, total sugars and non- reducing sugars in dry fruit pulp were found by treatment (250 g/tree magnetite as soil application followed by 5 ppm selenium spray). Reducing sugars in dry fruit pulp had inconstant trend in both seasons.
1-4- Macro and micronutrient in leaves:
Leaf content of N, Mg, Zn, Mn, Cu, Se and the amino acid proline were the highest with treatment (250 g/tree magnetite followed by spraying selenium at 5 ppm) but the same treatment recorded minimum leaf Cl and Na contents.
Silicon and boron showed inconstant trend in both seasons.
1-5- Mineral content in fruit pulp:
Mn and Se in fruit pulp were the highest by treatment (125 g/tree magnetite soil application followed by 20 ppm selenium spray). On the other hand N, P, K, Ca, Mg, Fe, Zn, and Si contents in fruit did not show particular trend in both seasons.
Finally it could be concluded that, the vegetative growth, yield/tree, fruit quality, leaf mineral content and fruit mineral content were improved and get the highest values by treatment: (soil application of magnetite at 250 g/tree followed by selenium spray at 5 ppm).
2- The second experiment:
Effect of natural mixture compound (nmc) soil application and selenium foliar spray on keitt mango trees grown under drip irrigation system in sandy soil.
This experiment aimed to study the effect of three levels of Natural Mixture Compound (NMC) (0, 2.5 and 5 kg./tree /year) as soil application and four concentrations of selenium (Se) (0, 5, 10 and 20 ppm) as foliar spray on the vegetative growth, yield, fruit quality, leaf and fruit mineral content. The experiment was arranged as a factorial experiment in a randomize complete block design with four replicates each of one tree.
The obtained results could be summarized as follows:
2-1- Vegetative growth:
The highest shoot number was obtained by treatment (NMC as soil application at 2.5 kg/tree followed by 20 ppm selenium foliar spray). The highest leaf area was achieved by treatment (2.5 kg/tree NMC as soil application followed by 5 ppm selenium). Both shoot length and leaf number showed inconstant trend in the two seasons.
2-2- Tree yield:
Maximum yield as number and weight of fruits per tree was recorded by treatment (2.5 kg/tree (NMC) as soil application followed by 5 ppm selenium spray).
2-3- Fruit quality:
2-3-1- Physical properties:
The highest weight, volume, pulp weight and pulp percentage of fruit were obtained by treatment (2.5 kg/tree NMC as soil application + 5 ppm selenium spray).
No constant trend was found in the two seasons regarding seed weight, length and width of fruit.
2-3-2- Chemical properties:
The highest values of total soluble solids, total sugars and reducing sugars were obtained with treatment (2.5 kg/tree NMC as soil application followed by 5 ppm selenium spray). But non-reducing sugars and total acidity showed inconstant trend.
2-4- Macro and micronutrient in leaves:
Leaf N, P, K, Ca, Mg, Fe, Zn, Mn and Cu contents showed the highest values with treatment (2.5 kg/tree (NMC) as soil application followed by 5 ppm selenium spray). The same treatment recorded the lowest values of Na and Cl. Treatment (5 kg/tree NMC as soil application followed by 20 ppm selenium spray) had the lowest B leaf content. On the other hand, selenium leaf content showed the highest values by treatment (2.5 kg/tree (NMC) as soil application followed by 20 ppm selenium spray).
The highest value of the amino acid proline was obtained by treatment (2.5 kg/tree NMC as soil application followed by 20 ppm selenium spray).
2-5- Mineral content in fruit pulp:
Fruit content of N, P, K, Ca, Mg, Mn, Fe, Se and Si showed inconstant trend in the two seasons. But Zn content achieved the highest value by treatment (2.5 kg/tree (NMC) as soil application followed by 20 ppm selenium spray).

Finally it could be concluded that, vegetative growth, yield/tree, fruit quality, leaf mineral content and fruit mineral content were improved and showed the highest values by treatment: (NMC soil application at 2.5 kg/tree followed by selenium foliar spray at 5 ppm).