Effect of Soil Conditioners,Seaweed Extracts and Chemical Fertilizers: onGrowth, Flowering and Bulbs Production ofNarcissus tazettaL. subsp."Italicus"Plant.

Narcissus tazetta L. subsp. "Italicus" belongs to the family "Amaryllidaceae", which is one of the most important ornamental bulbs plant, landscape, and cut flowers plant. So, it needs a balanced fertilization program to produce flowers of good marketing characteristics, healthy bundle growth and new developing bulbs of size and ideal weight suitable for flowering in the new season.
          Because most Egyptian lands suffer from high alkalinity, so the time has come to use safe alternative fertilizers. Those are able to make the element in a suitable form to absorption by plants without any toxicity to the soil. Green compost fertilization contains organic acids, which can chelate metallic elements, enhance the ability of them to absorption via plant and improve the properties of soil. Also, the chelate fertilizers have the same role, those can make inorganic nutrients are easier and faster to pass into the plant tissue directly via foliar spray or soil drench, also even in alkaline and calcareous soil conditions.While, seaweed extracts have many nutrients, vitamins, growth hormones and/or regulators, carbohydrates and amino acids, all of which stimulate plant growth.





          This experiment aimed to study the effect of soil conditioners "El-Zahra compost" (ZC), the chelating chemical fertilizer "Nutricomplex 20-20-20" (N20) and seaweed extracts "Algifert" (Alg) as a foliar spray and soil drench application on growth, flowering, bulb production and chemical constituents of Narcissus tazetta L. subsp. “Italicus" plants. This study was conducted during two cropping years 2015/16 and 2016/17 at El-Harrery village, El Montaza, The East of Alexandria, Egypt.The eight transactions were executed as follow : 1- Control media "without any fertilizers", 2- (ZC) [" El-Zahra compost" 10% from pot volume], 3- AlgS + AlgD ["Algifert" 1g/l foliar spray + 1g/l soil drench], 4- N20S+N20D ["Nutricomplex 20-20-20" 1g/l foliar spray + 1g/l soil drench], 5- ZC + AlgS+D [10% compost + "Algifert" (1g/l foliar spray + 1g/l soil drench)], 6- ZC+ N20S+D [10% compost + ["Nutricomplex 20-20-20" (1g/l foliar spray + 1g/l soil drench), 7- AlgS + N20D ["Algifert" 1g/l foliar spray + ["Nutricomplex 20-20-20" 1g/l soil drench] and the last 8- AlgD + N20S ["Algifert" 1g/l soil drench + "Nutricomplex 20-20-20" 1g/l foliar spray]. All the transactions had significant values compared to control. But the highly significant values resulted from the treatment of ZC+ AlgS+D in most growth characteristics followed by ZC+ N20S+D or AlgS+AlgD in some cases. Thus, when obtaining the highest quantity and quality of the vegetative growth, flowering characteristics, bulb production and chemical composition of Narcissus tazetta L. subsp. “Italicus" plant, it is preferable to add leaves compost to the growing soil with the addition of foliar spray and soil drench with either elements chelators or seaweed extracts