الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
Two experiments were carried out in both field and pots during the winter seasons of 2001/2002 and 2002/2003 at Baramon Agricultural Research Station Farm, Dakhalia Governorate to study the effect of planting date and slow release nitrogen fertilizers on yield and quality of spinach. Field experiments; were conducted to study the effect of planting date (15 Oct., 1 and 15 Nov.) and two nitrogen sources (urea as conventional source of nitrogen and urea formaldehyde coated urea as slow release nitrogen which was taken from Egyptian fertilizer Development) at three different rates (30, 45 and 60 kg N/fed). Pots experiment; were carried out to study the effect of prepared fertilizer, Gelatin coated urea and urea formaldehyde coated urea as well as conventional urea granules with three different rates (100, 200 and 300 mg/kg soil) in two type of soil (sandy and clayey). It can be concluded that the best treatment is adding 60 kg N/fed as a urea or ureaformaldehyde coated urea and sowing in early date (15 Oct.), which gave higher vegetative growth and total yield. Also, UF.C.U was more favourable for quality of spinach plant at fresh marketable stage than urea. However, oxalic acid, NO3 and NO2 concentration is in range of 6.85 <U+2013> 8.07 %, 49.65 <U+2013> 83.57 P.P.M, 1.35 <U+2013> 1.68 P.P.M respectively, which are considered less than the critical concentration tolerated by human body. Also, from the results of pot experiments, we can recommend to carry out a further research program to coat urea granules with gelatineos compounds and other like substances and using it to improve spinach quality grown under the different conditions of clay and sandy soil.