How to manage Orah mandarin during the fruit enlargement period? Master these key points

Every year from August to October is the peak period of fruit enlargement for Orah mandarin, and also a period of substantial autumn growth. At this time, the nutritional conflict between fruit development and autumn shoot growth is quite prominent. If you want to achieve high yield, sweet taste, and good storability, then management must be strengthened during the enlargement period. Let's take a look at the detailed introduction below.

1. Strengthen fertilization

In order to balance the vegetative growth and reproductive growth of Orah mandarin, balanced fertilization is needed. For example, for trees that are tall, bear many fruits, and have weak vegetative growth, heavy application of fruit-strengthening fertilizer is required, with reasonable and effective combination of nitrogen, phosphorus, and potassium fertilizers to meet the nutritional needs of both vegetative and reproductive growth. For trees in an off-year with few fruits and excessive vegetative growth, fertilization should be controlled, especially nitrogen fertilizer application, to prevent excessive vegetative growth, improve fruit quality. During the fruit enlargement period, insist on combining ground fertilization with foliar fertilization.

2. Drought resistance and waterlogging prevention

In July-August, during the fruit enlargement period and peak autumn shoot growth period of Orah mandarin, planting areas in the middle and lower reaches of the Yangtze River are prone to autumn drought, often causing small fruit, sunburn, fruit cracking, and fruit drop, seriously reducing fruit quality and yield. In southern and coastal or southwestern regions, heavy rain may occur during this period. If rainfall is excessive, fruit tends to enlarge and crack, and this damage cannot be ignored either. Therefore, drought prevention and water control during the fruit enlargement period are extremely critical. If drought occurs, irrigation must be timely; if heavy rain occurs, drainage and waterlogging prevention must be timely.

3. Improve quality

In the late fruit enlargement stage and maturation stage, spraying foliar fertilizer and hormones can effectively improve fruit quality: ① 0.2%-0.3% Baume degree lime sulfur mixture; ② 10mg/kg concentration 2,4-D plus 2% lime water mixed solution; ③ 0.5g-0.7g/kg paclobutrazol or 18/kg chlormequat; ④ 0.03%-0.05% rare earth solution; ⑤ 300-500 times rice vinegar solution; ⑥ coloring and sweetening agent. The above substances can inhibit autumn shoot growth, reduce nutrient consumption, promote fruit enlargement, increase fruit sugar content, and promote early fruit maturation.

4. Pest and disease control

During the fruit enlargement period of Orah mandarin, the main pests and diseases include resin disease, rust mite, anthracnose, scale insects, red spider mite, fruit-sucking noctuid moth, etc. They should be dealt with promptly when found, and preventive measures should also be taken routinely to avoid fruit drop and field disease before harvest.

The above is an introduction to the key management points for Orah mandarin during the fruit enlargement period. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.