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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.

Potassium and iron oxide nanoparticles were prepared via gamma irradiation using PVA and PVP as stabilizers and capping agent to control the size of the particles. HRTEM indicated the formation of potassium and iron oxide nanoparticles within the polymeric network of PVA and PVP with mean sizes 12 nm and 2.38 nm, respectively. The ultraviolet visible (UV-vis) spectroscopy measurements show a distinct characteristic absorption peak indicating the formation of potassium and iron oxide nanoparticles. As for the agricultural application, an experiment was carried out during the two successive seasons of 2019 and 2020 seasons at National Research Centre's experimental Station, El Nobaria Region, Behira Governorate, Egypt. Results show that 8 ml/l of nano potassium and 9 ml/l of nano iron oxide scored the highest values of plant length, number of leaves and branches, total plant fresh weight, dry matter percentage and chlorophyll reading. As for pod yield and its component the same both previous concentrations gave the highest pod length, pod number per plant, pod fresh and dry weight and total yield per feddan. Also, both concentrations gave higher protein percentage, total soluble solids percentage, potassium percentage and iron concentration as well as lower fiber percentage than other treatments.

This experiment was carried out during the two successive seasons of 2019 and 2020, to evaluate the effect of PVP and PVA as stabilizers and capping agents to control the size of the potassium mono hydrogen phosphate (potassium phosphate) and zinc oxide nanoparticles produced by gamma irradiation. HRTEM measurement reveals the formation of potassium mono hydrogen phosphate and zinc oxide nanoparticles within the polymeric networks of PVP and PVA, with mean sizes of 6.3 nm and 33 nm, respectively. Fourier transform infrared (FT-IR) spectroscopy revealed the structure formation of PVP/ potassium mono hydrogen phosphate nanoparticles and PVA/ zinc oxide nanoparticles. The formation of potassium mono hydrogen phosphate and zinc oxide nanoparticles is proved by UV-vis spectroscopy measurements, which reveal distinctive absorption peaks. The agriculture study during the two successive seasons of 2019 and 2020, under El Nuberia Region, Beheira Governorate show that potato plants cv.Spunta sprayed with 8 ml / l of potassium phosphate and 9 ml / l of zinc oxide nano composite gave the tallest plant, highest fresh and dry plant haulm and number of stems per plant. As for potato yield, both previous concentrations scored the highest number of tubers per plant, average tuber weight and total yield per feddan, as well as chemical constituents of tubers such as specific gravity, dry matter percentage, starch, phosphorus and potassium percentage as well as zinc concentration.