The latest key points for the management of fruit expansion period of fertile mandarin

The peak period of fruit expansion is from August to October every year, and it is also the period of mass growth in autumn, when the nutritional contradiction between fruit development and autumn shoot growth is more prominent. If you want to achieve the purpose of high yield, sweet taste and storage resistance, it is necessary to strengthen management during the expansion period. Let's take a look at the detailed introduction.

1. Strengthen fertilization

In order to balance the vegetative growth and reproductive growth of fertile mandarin, it is necessary to achieve balanced fertilization, such as the trees with tall plants, many fruits and weak vegetative growth should re-apply strong fruit fertilizer and a reasonable and effective combination of nitrogen, phosphorus and potash fertilizer. so the nutritional requirements of vegetative growth and reproductive growth. For the young trees with few fruit and excessive vegetative growth, it is necessary to control fertilization, especially the application of nitrogen fertilizer, prevent overgrowth, improve fruit quality, and adhere to the combination of ground fertilization and extra-root fertilization in the period of fruit expansion.

2. Drought resistance and waterlogging prevention

During the fruit expansion period and autumn shoot growth peak period from July to August, Wo mandarin was easily affected by autumn drought in the middle and lower reaches of the Yangtze River, which often caused fruit size, sunburn, fruit cracking and fruit drop, which seriously reduced fruit quality and yield. In the south and coastal or southwest regions, there will be torrential rain during this time, if the rainfall is too much, the fruit is easy to expand and cause fruit cracking, this harm can not be ignored. Therefore, it is very important to prevent drought and waterproof during the fruit expansion period. if there is a drought, it must be irrigated in time, and the rainstorm weather should be drained and waterlogged in time.

3. Improve the quality

In the late stage of fruit expansion and ripening period, the fruit quality can be effectively improved by spraying foliar fertilizer and hormone, ① 0.2% ⑤ 0.3% Baomedu stone sulfur mixture; ② 10mg/kg concentration 2% mae D plus 2% lime water mixture; ③ 0.5g~0.7g/kg paclobutrazol or 18/kg dwarf: ④ 0.03% Qing 0.05% rare earth solution; ⑤ 300ml 500 times rice vinegar; ⑥ coloring sweetener. The above substances can inhibit the growth of autumn shoots, reduce nutrient consumption, promote fruit expansion, increase fruit sugar content and promote fruit early ripening.

4. Pest control

During the fruit expansion period, the main diseases and insect pests are resin disease, rust wall lice, anthracnose, scale insects, red spiders, fruit-sucking armyworm and so on. It is found that they should be dealt with in time and control measures should be taken at ordinary times to avoid fruit drop and disease in the field before fruit picking.

The above is the introduction of the key points of the fruit expansion period of Wo mandarin. I hope it can help you. If you want to know more about it, please follow us.