الفهرس 
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Abstract
Two field experiments were carried out at Experimental Station Farm, Faculty of Agriculture, Mansoura University, Dakahlia Governorate, Egypt, during the two successive summer seasons of 2019 and 2020. The main objective of these experiments was to study the effect of foliar spraying with nano-zinc levels and mineral (nitrogen, phosphorus and potassium ”NPK” levels) fertilization on growth, yield, its attributes and grains quality of maize (Single Cross Watanya-6).Each experiment was carried out in a strip-plot design with three replicates. The vertical-plots were assigned to four zinc foliar application treatments as follows: 1- Without foliar spraying (control treatment). 2- Foliar spraying with solution of nano zinc at the rate of 200 mg/L in each spraying. 3- Foliar spraying with solution of nano zinc at the rate of 400 mg/L in each spraying. 4- Foliar spraying with solution of nano zinc at the rate of 600 mg/L in each spraying. The foliar solution volume was 200 liter/fed and spraying was conducted by hand sprayer (for experimental plots) until saturation point twice after 30 and 45 days from sowing (DFS). The horizontal-plots were allocated to four mineral nitrogen, phosphorus and potassium (NPK) levels as follows: 1- 100 % of the recommended doses (120.0 kg N + 45.0 kg P2O5 + 24.0 kg K2O/fed). 2- 80 % of the recommended doses (96.0 kg N + 36.0 kg P2O5 + 19.2 kg K2O/fed). 3- 60 % of the recommended doses (72.0 kg N + 27.0 kg P2O5 + 14.4 kg K2O/fed). 4- 40% of the recommended doses (48.0 kg N + 18.0 kg P2O5 + 9.6 kg K2O/fed).. STUDIED charACTERS: A- Nanoparticles characteristic. B- Growth characters: 1- Plant height (cm). 2- Ear height(cm). 3- Ear leaf area (cm2). 4- Stalk diameter (cm). C- Yield and its attributes: 1- Number of ear/plant. 2- Ear length (cm). 3- Ear diameter (cm). 4- Number of rows/ear. 5- Number of grains/row. 6- Number of grains ear. 7- Ear weight (g). 8- Ear grains weight (g). 9- Shelling percentage (%). 10- 100-grain weight (g). 11- Grain yield (ardab/fed). D- Grains quality: 1- Crude protein percentage (%). 2- Oil percentage (%). • The most important results obtained from this investigation can be summarized as follows: 1. Effect of foliar spraying with nano-zinc levels: Regarding the effect of foliar spraying with zinc levels in nano form (200, 400 and 600 mg/L in each spraying) in addition control treatment (without foliar spraying with nano-zinc) significantly affected growth characters (plant height, ear height, ear leaf area and stalk diameter), yield and its attributes (ear length, ear diameter, number of rows/ear, number of grains/row, number of grains ear, ear weight, ear grains weight, shelling percentage, 100-grain weight and grain yield/fed) and grains quality (crude protein and oil percentages in grains) of maize in both seasons. While, number of ear/plant did not significantly affected by foliar spraying with zinc levels in both seasons. It is clearly seen that, spraying maize plants two times with solution of nano zinc at the rate of 600 mg/L in each spraying produced the highest values of plant height, ear height, ear leaf area, stalk diameter, number of ear/plant, ear length, ear diameter, number of rows/ear, number of grains/row, number of grains ear, ear weight, ear grains weight, shelling percentage, 100-grain weight, grain yield/fed, crude protein and oil percentages in grains in the two growing seasons. The second best foliar spraying treatment was spraying maize plants with solution of nano zinc at the rate of 400 mg/L, which was followed by spraying with solution of nano zinc at the rate of 200 mg/L concerning its effect on growth characters, yield and its attributes and grains quality in both season. While, the lowest values of plant height, ear height, ear leaf area, stalk diameter, number of ear/plant, ear length, ear diameter, number of rows/ear, number of grains/row, number of grains ear, ear weight, ear grains weight, shelling percentage, 100-grain weight, grain yield/fed, crude protein and oil percentages in grains were obtained due to the control treatment (without foliar spraying) in the two growing seasons. 2. Effect of mineral nitrogen, phosphorus and potassium (NPK) levels: The obtained results in clearly verification that mineral nitrogen, phosphorus and potassium (NPK) levels i.e. 100 % of the recommended doses (120.0 kg N + 45.0 kg P2O5 + 24.0 kg K2O/fed), 80 % of the recommended doses (96.0 kg N + 36.0 kg P2O5 + 19.2 kg K2O/fed), 60 % of the recommended doses (72.0 kg N + 27.0 kg P2O5 + 14.4 kg K2O/fed) and 40% of the recommended doses (48.0 kg N + 18.0 kg P2O5 + 9.6 kg K2O/fed) significantly affected growth characters (plant height, ear height, ear leaf area and stalk diameter), yield and its attributes (ear length, ear diameter, number of rows/ear, number of grains/row, number of grains ear, ear weight, ear grains weight, shelling percentage, 100-grain weight and grain yield/fed) and grains quality (crude protein and oil percentages in grains) of maize in both seasons. While, number of ear/plant did not significantly affected by mineral nitrogen, phosphorus and potassium (NPK) levels in the second season and vice-versa in the first season. The achieved results showed that mineral fertilizing maize with 100 % of the recommended doses (120.0 kg N + 45.0 kg P2O5 + 24.0 kg K2O/fed) produced the highest values of plant height, ear height, ear leaf area, stalk diameter, number of ear/plant, ear length, ear diameter, number of rows/ear, number of grains/row, number of grains ear, ear weight, ear grains weight, shelling percentage, 100-grain weight, grain yield/fed, crude protein and oil percentages in grains in the two growing seasons. This level followed by mineral fertilizing maize plants with 80 % of the recommended doses (96.0 kg N + 36.0 kg P2O5 + 19.2 kg K2O/fed), which followed by mineral fertilizing with 60 % of the recommended doses (72.0 kg N + 27.0 kg P2O5 + 14.4 kg K2O/fed) and then mineral fertilizing with 40% of the recommended doses (48.0 kg N + 18.0 kg P2O5 + 9.6 kg K2O/fed), which recorded the lowest values of plant height, ear height, ear leaf area, stalk diameter, number of ear/plant, ear length, ear diameter, number of rows/ear, number of grains/row, number of grainsear, ear weight, ear grains weight, shelling percentage, 100-grain weight, grain yield/fed, crude protein and oil percentages in grains in the growing seasons. 3. Effect of interaction: The obtained results of this study indicated that there was significant effect on plant height, ear height (in the first season), ear leaf area (in both seasons), ear length (in the second season), ear diameter (in both seasons), number of rows/ear (in the first season), number of grains/row (in the second season), number of grains ear (in the first season), 100-grain weight, grain yield/fed, crude protein and oil percentages in grains (in both seasons) as a result of the interaction between foliar spraying with nano- zinc levels and mineral nitrogen, phosphorus and potassium (NPK) levels. from the achieved results of this study, it could be noticed that the highest values of plant height, ear height, ear leaf area, stalk diameter, number of ear/plant, ear length, ear diameter, number of rows/ear, number of grains/row, number of grains ear, ear weight, ear grains weight, shelling percentage, 100-grain weight, grain yield/fed, crude protein and oil percentages in grains were resulted from mineral fertilizing maize with 100 % of the recommended doses (120.0 kg N + 45.0 kg P2O5 + 24.0 kgK2O/fed) and spraying maize plants twice with solution of nano zinc at the rate of 600 mg/L in each spraying. The second best interaction treatment without significant differences in most cases was mineral fertilizing maize with 80 % of the recommended doses (96.0 kg N + 36.0 kg P2O5 + 19.2 kg K2O/fed) and spraying maize plants twice with solution of nano zinc at the rate of 600 mg/L in each spraying regarding its effect on growth characters, yield and its attributes and grains quality in both seasons. The third best interaction treatment was mineral fertilizing maize with 60 % of the recommended doses (72.0 kg N + 27.0 kg P2O5 + 14.4 kg K2O/fed) and spraying maize plants twice with solution of nano zinc at the rate of 600 mg/L in each spraying in both seasons. While, the lowest values of plant height, ear height, ear leaf area, stalk diameter, number of ear/plant, ear length, ear diameter, number of rows/ear, number of grains/row, number of grains ear, ear weight, ear grains weight, shelling percentage, 100-grain weight, grain yield/fed, crude protein and oil percentages in grains were resulted from mineral fertilizing maize with 40 % of the recommended doses (48.0 kg N + 18.0 kg P2O5 + 9.6 kg K2O/fed) without foliar spraying with nano-zinc in both seasons.