Impact of biochar and compost amendment on soil quality, growth and yield of a replanted apple orchard in a 4-year field study by Khorram, Mahdi Safaei, Zhang, Gan, Fatemi, Akram, Kiefer, Rudolf, Maddah, Kamalodin, Baqar, Mujtaba, Zakaria, Mohamad Pauzi, Li, Gang