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Effects of Postharvest 1-MCP and Calcium Treatments on the Quality andSkin Browning Spot Incidence of Huangguan Pear Fruit Effects of Bagging on Browning Spot Incidence and Content of Different Forms of Calcium in‘Huangguan’Pear Fruits Effects of Postharvest 1-MCP and Calcium Treatments on the Quality andSkin Browning Spot Incidence of Huangguan Pear Fruit Effects of Bagging on Browning Spot Incidence and Content of Different Forms of Calcium in‘Huangguan’Pear Fruits