《Table 2 Fertilization treatments for pear-jujube trees》

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《Effects of Iron and Zinc Fertilizers on Antioxidant Activity of PearJujube in Loess Hilly Region》

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Under drip irrigation conditions，N，P and K fertilizer were applied as basic fertilizers，and iron and zinc fertilizers of different concentrations were sprayed to the leaves.During the budding stage，half of the urea（237.5 g/plant），calcium superphosphate（2 273 g/plant）and potassium sulfate（245 g/plant）were applied to the roots；during the fruit enlargement period，the other one half of the urea was applied.During the budding period，iron and zinc fertilizers were applied according to Table 2 three times at an interval of 10 days.The amount of spraying was 4 L/plant.There were 5 repetitions for each treatment.Protective trees were arranged on both side of each test tree，and the area of each plot was 500 m2.