Qionghai city is relatively flat, with high terrain in the west and low terrain in the east, with an altitude of 10-60m. The soil types are mainly yellow soil, paddy soil, latosol, lateritic red soil and aeolian sandy soil. The soil layer is deep, generally reaching 80cm, with a PH value of 4.5-6.0. The soil organic matter is rich in nitrogen, phosphorus and potassium. Wanquan River, the third largest river in Hainan Province, originates from the confluence of Wuzhishan and Limushan, with a length of 163Km, a drainage area of 3,693 cubic kilometers and a riverbed gradient of 3.2‰. It is an unpolluted tropical river in China with beautiful ecological environment. There are 7 medium-sized reservoirs in the whole territory, with a total storage capacity of 259 million cubic meters, and the forest greening coverage rate is 5 1.2%, and the urban greening coverage rate is over 45%. Qionghai belongs to tropical monsoon and humid maritime climate, with a pleasant climate, with an average annual temperature of 24.2℃, an average annual sunshine time of 2 155 hours, abundant rainfall and an average annual rainfall of 20 16. 1 mm, which is very suitable for planting Qionghai guava.
Protection scope of Qionghai guava: the whole territory of qionghai city. Including Dalu, Tayang, Changpo, Jiaji, Zhongyuan, Wanquan, Boao, Tanmen, Shibi, Yangjiang, Longjiang, Huishan and other towns11007'1/kloc-0. It borders the South China Sea in the east, Wanning City in the south, Ding 'an County, tunchang County and Qiongzhong County in the west, and Wenchang City in the northeast. Qionghai guava has a planting area of 23,000 mu and an annual output of 46,000 tons.
The external sensory characteristics of Qionghai Guava are as follows: the fruit is nearly spherical, the fruit shape is regular, the weight of a single fruit is 300g-600g, the skin is yellow-green, the skin is thin and fleshy, the flesh is yellow and white, the seeds are few, the juice is rich and dregs, it is crisp, smooth and refreshing, and the quality is good. 2. Intrinsic quality index: Qionghai guava has soluble solids content of 10%- 13.5% and vitamin C content of 66.5-70(mg/ 100g). 3. Safety requirements: Qionghai guava should meet the Guava Quality and Safety Requirements (NY/T5 18-2002).