الفهرس 
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Abstract
Objectives:
Etude effect of organic, Bio- and chemical fertilization on yield and quality of spinach plant.
Methods & Results:
Field trial was conducted at EL-Gawashna village, Sharqia governorate, Egypt, in winter season 2010/2011. To investigate the spinach yield and its quality as influenced by compost ( 0.0 and 15m3 fed-1 ) as organic an nitrobine and microbine as bio – fertilization and N, P and K levels ( 0.0, 50, 100 and 150% of NPK recommended ) as mineral fertilizations.
24 treatments were arranged in split - split block design with four replicates, where the main plots were organic treatments , subplots were bio-fertilizer treatments and the sub - subplot were the chemical fertilizer levels.
The obtained results can be summarized in:
Adding compost gave a significant increase in fresh yield of spinach plants compared with that not have compost.
•Inoculated spinach seeds with biofertilizers (nitrobine and microbine) gave the highest yield in fresh plants of spinach ( ton fed-1 ).
•Adding NPK mineral fertilization at 100% from the recommended dose, gave the highest yield in fresh plants of spinach (7.926 ton fed-1)
•Organic fertilization significantly reduced the nitrate content in spinach. The mean nitrate content decreased from 273.584 ppm under no organic addition to 234.925 ppm in fresh spinach plant when compost was added at the rate of 15 m3 fed-1, i.e. 14.13 % reduction.
•NPK mineral fertilization significantly increased the nitrate content in spinach plant. The means of nitrate content are 106.5, 188.8, 292.7 and 429.2 ppm when NPK mineral fertilizers are added at zero, 50, 100 and 150 % from the recommended dose, respectively. These ( 50. 100 and 150 ) levels of NPK mineral fertilization increased the nitrate content by 77.3, 174.9 and 303.1 % compared to zero level.
Conclusion:
It can be concluded that, spinach plants in soil supplied with organic fertilizers ( 15m3 compost fed-1 ) + bio-fertilizers and 50% NPK showed better fresh weight ( ton fed-1) and have good quality for human as reducing nitrite and nitrate, which has good favorite effect.