Substitution of Conventional Organic and Chemical Fertilization by Some Biostimulants and Their Effect on Growth, Flowering and Bulb Productivity of Narcissus Tazetta Plant.

A study was carried out at El-Mathana Agricultural Research Station, Luxor Governorate, Egypt in two seasons of 2017 and 2018 where plants of Narcissus tazetta were treated with NPK at 2 g/plant, salicylic acid at 100 and 200 ppm, garlic extract at 125 ml/plant, ascorbic acid at 100 and 200 ppm, citric acid at 100 and 200ppm and yeast at 3 and 5 g/plant. Results showed that plants treated with salicylic acid at 200 ppm (after transaction with NPK) achieved the highest value of all morphological characteristics of plants i.e. plant height, number of leaves per plant, flowering duration, number of bulblets per plant, bulb diameter, bulb fresh weight as well as fresh and dry weight of leaves beside chemical content of chlorophyll a,b and carotenoids in addition to the percentage of nitrogen, phosphorus and potassium compared to the control. Applying salicylic acid at 100 ppm (after transaction with NPK) had the highest stimulate effect on fresh, dry weight, diameter and longevity of cut flower, also, it had a strong effect in increasing fresh, dry and length of scape of flowers with raising chemical traits. This experiment clarified the importance of natural materials for increasing the efficiency of the vegetative and flower qualities of Narcissus tazetta.