Effect of Foliar Application with Potassium Nitrate and Copper Sulfate on Fruit Yield and Quality of Pear (Pyrus communis L.) Trees by Muhammad Sajid, Saeed Ul Haq, Abdullah Jan, Fahad Noor, Qazi Shoaib Ali, Mehboob Alam, Akhtar Zaman, Fawad Ali Shah, Walid F. A. Mosa, Hesham S. Abada

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