this is a spring orange, commonly known as rake orange. It is a hybrid variety, which originated from the fruit tree experimental field in Shizuoka County, Japan, and was introduced from China Citrus Research Institute in 21. It is widely planted in Pujiang County, Meishan City, pengshan county, Danling County, Rongxian County, Renshou County, Jintang County, Chongqing, Jiangxi, Hunan, Sanming, Nanping, Longyan, Fuzhou and other places in Sichuan, and its maturity is at the end of December-early spring. Because you can hear a "bang" when you fall to the ground, the skin cracks. Commonly known as rake rake orange.