In Shandong province, the management method of citrus is the same as that of rutaceae fruit trees such as citrus, bergamot and grapefruit. First of all, we should use relatively loose and breathable sand with good drainage and rich organic matter from the beginning of seedling raising.

Soil conditions: Orchard soil with rich humus is selected for potted plants, and a small amount of controlled release fertilizer and trace elements are added. The purpose of this configuration of soil is to ensure the balanced nutrition of plants and prevent citrus from being overnourished and difficult to set fruit. Topdressing the compound fertilizer with phosphorus and potassium as the main fertilizer in the flower and fruit period, and applying some trace element fertilizers such as iron, calcium and zinc. If too much nitrogen fertilizer is used,

Unbalanced nutrient composition and proportion will hinder the growth and development of oranges, resulting in failure to complete pollination and flowering without fruit. If the large and small fruits are obvious, it means that the nutrients are insufficient and only some fruits can grow.

Fertilization and watering are to meet the daily nutritional needs of citrus growth; The purpose of plastic pruning is to control, promote and coordinate the nutritional balance of plant tissues and organs, so as to keep the tree in a moderate and vigorous state. When orange trees are potted, the root system is limited by space and pot soil. If the topdressing of citrus is too diligent, the new shoots will be pumped in summer, and the carbohydrate consumption will be too high, which will cause the phenomenon of flower falling, and then the fruit setting rate will not be improved, so it is not recommended to apply too much nitrogen fertilizer.

Delayed pest control or chemical injury in the flower and fruit period is also an important reason why flowers and fruits cannot bear fruit. The best way to pot oranges is to put the orange tree in a well-lit place, dry the topsoil before watering it when it blooms, and don't keep it wet, let alone soak it. During the flowering period, it is necessary to prevent rain and stop spraying water on plants, otherwise the pollen will be lost.

In order to cultivate the vitality of trees, trees can only bear fruit if they grow well. In addition, the technology of flower protection and fruit protection can also be adopted. From the end of April to the beginning of May, 50ppm of 920, 1000 times of topaz and 800 times of dichlorvos were sprayed with 0.2% potassium dihydrogen phosphate in three quarters of Xie Hua.