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Background: Nanotechnology introduces smart agricultural products which may be a milestone in solving many common economic and ecological issues. Nano-fertilizers show unique characters which do not exist in their conventional counterparts.This work aimed to determine the effects of three foliar spraying of nano micronutrient fertilizers iron, manganese, and zinc as well as the controlon the vegetative growth, productivity, physical quality, and pod nutritional value of two snap bean cultivars Bronco and Flantino and also their interactions. Results: Flantino cultivar recorded the highest values of vegetative growth, fresh pod yield, pod physical quality (length, diameter, and fresh weight), dry weight, and pod nutritional value content expressed as P, K, Zn, Mn, Fe, Cu, crude protein, total soluble solids, and fiber. Conclusion: Foliar application of zinc nano-fertilizer increased the studied characteristics significantly compared with other nano micronutrients. Also, the combined effect of Flantino cultivar with zinc nano-fertilizer treatment recorded the highest values of vegetative growth, fresh pod yield, pods physical quality and nutritional value.

Background This field experiment was carried out during the two successive seasons of 2019 and 2020 at the experimental farm of the National Center for Radiation Research and Technology, Nasr City, Cairo, Egypt, to evaluate the effect of low gamma irradiation doses (0, 2.5, 5 and10 Gray) on growth, yield and chemical constituents of Jerusalem artichoke tubers as one of the non-traditional vegetable crops which had a high nutritional and medicinal value. Results The obtained results show that gamma irradiation at dose rate 5 Gy gave the best results of plant height, number of branches, shoot fresh and dry weight compared with treatments exposed to gamma irradiation at dose rate 2.5 and 10 Gy and also higher photosynthetic pigments such as chlorophyll a, b, a + b and carotenoids than un-irradiated tubers. Same stimulative dose (5 Gy) yielded the highest total yield per feddan, plant yield, tuber fresh weight and dry matter percentage of tubers. Regarding chemical constituents of tubers, it was observed that gamma irradiation at dose 5 Gy scored higher percentage of nitrogen, phosphorus, potassium, total carbohydrates and inulin than other doses. From another point, the highest concentration of total soluble phenols and flavonoids was correlated with 5 and 10 Gy of gamma irradiation. Conclusions The moderate dose of gamma irradiation 5 Gy has a stimulative effect on growth of Jerusalem artichoke which reflects on tubers yield and their chemical constituents.

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EGETABLE crops are importantsources of vitamins, and minerals for human, and provides him with several bioactive compounds. Producing safe and healthy vegetables for human diet is of a great global issue. Thisneeds to exploit all available resources, particularly soils understressful conditions such as saline, saline-sodic, waterlogged and low fertile soils), climatic stress (drought, flooding, saltwater intrusion, and heat stress), and along with normal conditions. Nano-biofortification can support the vegetable productivity especiallyunder such conditions by using the biological nanonutrients. Bio-nanonutrients exhibitsmany distinguishableproperties than mineral forms such as higher biological activity, lower toxicity, and better bioavailability. Bio-nanonutrients also promote the vegetable growth, productivity and enhance planttolerance towards different stresses by reinforcing the function of antioxidant enzymes. Thus, production of biofortified vegetables under stressful conditions might be an optimum and sustainable solution particularly by using the biological nanonutrients like selenium. The controlling factors that are needed for a successful nanobiofortification program of vegetables are correlated with growing media, plant species, and method application of nanonutrients. The over dose of nanonutrients maycause a nanotoxicity for cultivated plants, and then human health after consumption. This problem can be managed by following the 4R Nutrient Stewardship concept, which focuses on the right rate, right source, right time, and right place. This program will be discussed in more details in this review article.