Generally, it should be applied before flowering or after withering, but not during flowering.

The nutritional value and efficacy of navel orange are 1. The nutritional value of navel orange is very rich. In 100g, navel orange contains about 0.8g of protein, about 0.6g of dietary fiber, about 160g of carotene, about 33mg of vitamin C, about 0.3mg of nicotinic acid and about 159mg of potassium. Copper is about 0.03 mg, zinc is about 0./kloc-0. 4 mg, and it also contains fat, moisture, heat, malic acid, citric acid and so on, which is very beneficial to human body. 2. The vitamin C component rich in oranges can play a certain role in eliminating excess free radicals in the human body and can effectively resist radiation. The vitamin C content in oranges is twice that of oranges. Oranges are rich in cellulose, pectin and other substances. Proper use of oranges can promote gastrointestinal peristalsis to a certain extent, effectively eliminate some harmful substances in our body, and play a role in clearing the intestines and relaxing bowels. Orange is a kind of fruit with special smell, which can relieve the psychological pressure of human body to a certain extent and keep us relaxed and happy. Oranges are very rich in sugar, rich in fructose and containing about 85% water. Eating oranges in moderation can not only refresh and quench thirst, but also restore physical strength quickly.