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Two field experiments were conducted during 2018/2019 and 2019/2020 seasons at Shandaweel Agriculture Research Station, Sohag Governorate, to study the effect of different rates of mineral NPK fertilization under foliar application with Nano NPK, on vegetative growth, yield and quality of onion. Split plot design with three replicates was used. Mineral NPK fertilization rates occupied the main plots (100% NPK, 75% NPK, 50% NPK and 25% NPK), whereas Nano NPK spraying rates (control, 2 L/fed, 4 L/fed and 6 L/fed) occupied the sub plots. The obtained results could be summarized as follow: (i) Application of 100% NPK gave the highest values of plant height while, application of 25% of NPK gave the lowest values, in the two seasons; (ii) Spraying with Nano NPK at rate of 6 L /fed appeared the highest values of plant height, whilst, spraying with water (control treatment) appeared the lowest values; (iii) Application of 100% of mineral NPK gave the highest values of total yield, while, application of 25% of NPK gave lowest values in both seasons; (iv) Spraying with Nano NPK at rate of 6 L /fed appeared the highest values of total yield/fed, whilst, spraying with water (control treatment) appeared the lowest values, in the two seasons; (v) The highest values of total yield/fed were obtained by using 75% mineral fertilization and spraying with Nano NPK at rate of 6 L/fed, in both seasons; and (vi) The highest values of exportable bulbs yield were obtained by using 75% mineral fertilization and spraying with Nano NPK at rate of 6 L/fed., while, the lowest values were obtained by application of 25% of mineral NPK and spraying with water (control treatment), in both seasons.

This experiment was carried out at the Experimental Farm of Shandaweel Agricultural Research Station, Sohag, (ARC), during 2018/2019 and 2019/2020 seasons, to study the effect of nano fertilizers through injection on growth, yield and quality of onion Giza 6 Mohassan cultivar under Sohag conditions. Four different mineral (NPK) treatments (100% NPK, 75% NPK, 50% NPK and 25% NPK) and four different injections with nano NPK [(control (treatment without injection), 5, 10, and 15 L fed. -1 in addation to the control treatment (without injection) were applied. The experiment was conducted in split plot design with three replicates. The different mineral NPK treatments were arranged in the main plot and the different injection with nano NPK treatments were assigned to sub plots. The results showed that both of the mineral NPK rates and the injection onion with nano NPK rates significantly affected most of studied traits, in the both seasons. The interaction between the two studied factors, significantly affected both total and exportable bulb yield traits in two seasons. The injection with the nano NPK rate (10 L fed. -1 ) and the mineral NPK (75% NPK and 100% NPK) achieved the highest values of total bulb yield (21.99 and 21.85) ton fed. -1 . in the first and second season, respectively. While, the treatment without injection (control treatment) with the lowest mineral NPK (25% NPK) gave the lowest values of total bulb yield (14.06 and 12.75) ton fed.in the first and second season, respectively. The injection with the nano NPK rate (15 L fed. -1 and 10 L fed. -1 ) achieved the highest values of exportable bulb yield (18.51 and 18.56) ton fed. -1 in the first and second season, respectively. Therefore, the results of this study recommend the use of mineral NPK combined with nano NPK as soil injection (75% mineral NPK + 10L fed. -1 nano NPK), to increase the total and exportale yield of onion, reduce environmental pollution by providing a quarter of the recommended amount of chemical fertilizers and saving hard currency by reducing the import of chemical fertilizers.

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