Solution: targeted supplementation of yellow flowers or iron-containing fertilizers.
2. Malnutrition causes the leaves of lemon trees to turn yellow: after flowering, the leaves turn yellow and fall off.
Solution: When the leaves become Huang Shi due to malnutrition, potassium dihydrogen phosphate can be sprayed. This fertilizer contains a lot of trace elements besides nitrogen, phosphorus and potassium. Usage: Spray 0.3% on the leaf surface and apply it to the soil in the basin, once every half month in the growing season. .
3、? Root rot caused the leaves of lemon trees to turn yellow: the bark rotted and smelled of distiller's grains.
Solution: Root rot is often caused by too much water in the basin or too much fertilization. The diseased part and a small amount of healthy tissue can be scraped clean with a sharp knife, and 65,438+000 times of red copper and 200-300 times of topaz are applied to the scraped mouth, and the wound can be covered with soil after healing.
4. Insects cause the leaves of lemon trees to turn yellow: visible pests.
Solution: Manually exterminate insects or spray corresponding chemicals.
Maintenance experience of lemon trees:
1. After the lemon blooms, in addition to applying thin fertilizer once a week, the flowers and fruits must be thinned. Sparse some buds before flowering; After flowering and fruit setting, in order to reduce nutrient consumption, some young fruits with improper positions should be thinned.
2. In the process of fruit growth, if the fertilizer and water are sufficient and the plants are well nourished, some branches will sprout new buds, and the growth of new buds will inevitably divert some nutrients, which will affect the fruit growth. In order to protect the fruit, the new buds should be smoothed in time.
3. When the fruit turns yellow, stop fertilizing, reduce watering and keep the soil moist and slightly dry. If we continue to give too much fertilizer and water, the fruit will ripen and fall early, shortening the viewing time.
4, lemon likes fat, usually it should be relatively thin fertilizer. Apply decomposed liquid fertilizer once before the plants germinate, and then apply liquid fertilizer mainly containing nitrogen every 7 ~ 10 days to promote more branches and leaves and more spring shoots.
5, after each coring, timely fertilization, promote the early maturity of branches. In the process of lemon growth, you can sprinkle some cake fertilizer on the basin surface, so that some fertilizer penetrates into the soil every time you water it, which can enhance fertility. After autumn, fertilization will be reduced, plant nutrition will be avoided, autumn shoots will be promoted, and fruits will compete for nutrients, leading to fruit drop.
reference data
Personal Library:/content/17/0522/21/27704636 _ 656263535.shtml.