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The present study was carried out to evaluate the effect of different phosphorus fertilization rates at [0.0, 30 and 45 kg/feddan as P2O5, nano micronutrients concentrations (0.0, 250, 500 and 100 mg/l) as well as their combinations on growth and production of fennel (Foeniculum vulgare, L.). A field experiment was carried out at Experimental Farm (Ghazala Farm), Fac. Agric., Zagazig Univ., Egypt, during the two winter consecutive seasons of 2017/2018 and 2018/2019. Phosphorus fertilization as main plots and nano-micronutrients called "Magro NanoMix" which contained (Fe 6%, Zn 6%, B 2%, Mn 5%, Cu 1% and Mo 0.1%) as subplots were considered. The obtained results showed the importance of the nano-micronutrients on improving fennel growth, fruits and volatile oil yield compared to control. Fennel plants treated with phosphorus fertilizer or/and nano micronutrients instigated critical increments in vegetative growth (plant height and branch number/plant as well as dry weight of herb/plant), yield (number of inflorescence /plant, fruit yield/plant and /feddan), volatile oil production (volatile oil percentage and yield/plant and /feddan) and some chemical constituents (total phosphorus, total carbohydrates percentage and total chlorophyll content), as contrasted and un-treated plants. In general, 45 kg P2O5/feddan + 500 or 1000 mg/l of nano-micronutrients as foliar spray had significant effects in above mentioned parameters of fennel plant compared to the other combinations under Sharkia Governorate conditions.

Growth and Productivity of Fennel (Foeniculum vulgare, Mill) Plants as Affected by Phosphorus Rate and Nano-Micronutrients Concentration