الفهرس 
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Abstract
This work was executed during two successive seasons of 2012 and 2013 in the Nursery and Laboratory of Faculty of Agriculture, Minia University. The aim of this study was to investigate the response of vegetative and root growth and some chemical composition of Populus nigra plants grown in sandy soil to four levels of FYM (0, 125, 250 and 500 g / container) and seven fertilization treatments (control, phosphorein, Minia Azotein, phosphorein + Minia Azotein + 50 % NPK dose, phosphorein + Minia Azotein + 75 % NPK dose and NPK (full dose), as well as, the interaction between them.
The obtained results could besummarized as follows:
1- Effect of FYM on:
1-A- Vegetative and root growth parameters:
All vegetative and root growth parameters of Populus nigra, namely : plant height, stem diameter, number of branches and leaves/plant, leaves fresh and dry weights /plant, stem plus branches fresh and dry weights/plant, aerial plant parts fresh and dry weights /plant, length of the longest roots, fresh and dry weights of roots/plant significantly increased by fertilizing plants with FYM at 125, 250 and 500 g/container compared with control. The high level of FYM was the most effective treatment.
1-B- Chemical composition:
1-B-1- Photosynthetic pigments:
Application of FYM at three used levels led to significantly increment in the contents of chlorophyll a, b and carotenoids in the fresh leaves in comparison with the control treatment.
The best results were recorded due to the application of high level of FYM (500 g/container).
1-B-2- N, P and K %:
Fertilizing plants with the three levels of FYM significantly increased N, P and K % over the control.
The highest values were obtained with the high level of FYM (500 g/container).
2-Effect of bio. and/or mineral NPK fertilization treatments on:
2- A- Vegetative and root growth parameters:
All plant growth parameters were significantly increased due to use of all bio. and/or mineral NPK fertilization treatments. The treatments of mineral NPK (full dose) followed by bio. + 75 % NPK dose, in all cases gave the significantly highest values without significant differences between them.
2-B- Chemical composition:
2-B-1- Photosynthetic pigments:
All used six treatments of bio. and/or NPK fertilization significantly enhanced the contents of chlorophyll a, b and carotenoids when compared with control in both seasons. The highest contents of pigments resulted from application plants with NPK (full dose) or bio. + 75 % NPK dose.
2-B-2- N, P and K %:
All used fertilization treatments had significantly positive effect on N, P and K %. The best results were recorded with full dose of NPK following by 75 % NPK plus biofertilizers without significant differences between them in case of N %.
3- Effect of the interaction treatments on:
3-A- Vegetative and root growth parameters:
The interaction between FYM and bio. and/or mineral NPK fertilization treatments was significant, in both seasons, for all studied parameters of vegetative and roots growth. The best interaction treatments were FYM3 × NPK (full dose) or FYM3 × 75 % NPK + biofertilizers.
3-B- Chemical composition:
3-B-1- Photosynthetic pigments:
The interaction between main and sub plots (A×B) was not significant for the three studied pigments.
3-B-3- N, P and K % :
The interaction between main and sub plots (A×B) was significant for N, P and K %. The best interaction treatments for the three elements percentages were FYM at high level in combination with NPK (full dose) or biofertilizers + 75 % NPK dose.