Potted lemons, if not properly managed, often only bloom, but bear no fruit or little fruit, or even do not bloom. In order to make potted lemons blossom and bear fruit every year, scientific management must be carried out in water, fertilizer and pruning, so as to achieve fruitful results. The main links of management are as follows: reasonable pruning-there are two reasons for pruning potted lemons. First, the pot is small, the soil is small, and the nutrients provided are limited, which can not meet the needs of lemon growth and must be pruned; Second, through pruning, the rational distribution of nutrients in the tree can be adjusted, so that limited nutrients can be supplied to buds and leaves to form more fruiting branches, thus achieving full flowering and fruiting branches. The new shoots of potted lemons must be pruned intensively before they germinate. First of all, we should remove dead branches, diseased branches, clustered branches, inward branches, cross branches and sprouting branches. Strong branches and weak pruning, leaving 4.5 full buds; The weak branches are strongly cut, leaving 2.3 buds, so that each branch produces more robust spring shoots. After the spring shoots are fully grown, in order to control their excessive growth, 3.4 branches can be lightly cut off. When the new shoots grow to 6 ~ 8 knots, it is necessary to remove the heart to induce more summer shoots. "Water-locking" before flowering-In order to prevent the summer shoots from growing too vigorously, at the same time, the trees should accumulate nutrients and promote the formation of buds, and "water-locking" the potted lemons before the arrival of summer. The specific method is to gradually reduce the water supply to potted lemons more than ten days before the summer heat; In the first 5 days, the water was stopped, the basin soil was exposed to the sun, a lot of water evaporated, and the basin soil was dry; Due to the lack of water in roots, branches and leaves lose water, and leaves wither and curl. In order to prevent the leaves from dehydration, water can be sprayed on the leaves in the morning and evening, and a small amount of water can be sprayed on the pot soil at the same time, so that the axillary buds of lemon will expand day by day under the condition of drought and not dying, and the color of the buds will turn from green to white. When most axillary buds turn from green to white, "withholding water" will succeed in promoting flowers. At this time, the water supply of potted lemons should be restored in time. Protect the flowers and fruits-after the lemon blooms, in addition to applying thin fertilizer once a week, it is also necessary to dilute the flowers and fruits. Sparse some buds before bloom; After the flowers wither and set fruit, some young fruits in inappropriate positions should be thinned out to reduce the consumption of nutrients, so that the limited nutrients can be concentrated on the preserved flowers and fruits, and the fruits can grow bigger and better. In the process of fruit growth, if the fertilizer and water are sufficient and the plants are nutritious, some branches will sprout new buds, and the growth of new buds will inevitably divert some nutrients, which will affect the growth of fruits. In order to protect the fruit, the new buds should be smoothed in time. 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. Rational fertilization-lemons like fertilizer, and usually apply more 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. Fertilize in time after each coring to 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. Turn over the pot-potted lemons have limited nutrient supply due to lack of pot soil. After years of lack of soil fertility, lemons will weaken year by year, with fewer flowers and fewer fruits. In order to keep the lemon blossom and bear fruit every year, it is necessary to turn over the pot. The best turning time is half a month before lemon germination. Before turning over the pot, prepare a pot that is one size larger than the original pot, take the lemon out of the pot, and don't break the mud. Cut off the topsoil with a thickness of 1.2cm along the mud lump, cut off the dead roots and rotten roots, cut off the soil with a thickness of 1cm at the bottom of the mud lump, and take out the tiles originally inserted in the pot bottom pad. The drainage holes of the new pool are laid with tiles. First lay a drainage layer with a thickness of 2.3 cm, and then lay a nutrient-rich culture soil with a small amount of superphosphate with a thickness of 4.5 cm. Then put the lemon mud balls into the pot, fill the culture soil around the mouth of the pot, slightly compact the pot soil, water the roots, put it in a ventilated and semi-cool place, and put it back in place for daily management after one week. First, change pots and soil: in March and April in spring, potted lemons must be turned over to change soil. If the flowerpot is too small, you can change it to a suitable flowerpot. If the flowerpot is still suitable, the original flowerpot can be replaced with new soil, and the base fertilizer should be applied when changing the soil. Second, spring pruning: spring pruning is combined with changing pots in spring, and internal branches, dead branches, root leaves of pests and diseases, and redundant branches are cut off to facilitate plant fruiting. 3. Rational fertilization: Lemon plants should be topdressing many times before flowering and after fruiting, applying multi-element flower fertilizer once a month and spraying flower nutrient solution once every half month to ensure that the fruits are not easy to fall off and have bright colors. Fourth, prevent defoliation: defoliation affects the fruit of lemon. In order to avoid falling leaves, in daily management, avoid watering more and watering less. 5. Shading at noon: When the temperature exceeds 30℃ at noon, it should be shaded for about 3 hours, otherwise it will affect the normal flower shape and hinder the plant from bearing fruit. 6. Artificial pollination: Artificial pollination is an important measure for multiple fruits. It is best to pollinate the petals in time after they grow. This work is carried out at around 9: 00 every morning, and the effect is good. Seven, pest control: summer and autumn are the seasons with frequent pests and diseases, so it is necessary to do a good job of prevention and control. Pest control is more important than cure, and anthers are sprayed every half month, about 9 am and 4 pm. It is not advisable to spray in the hot sun at noon to prevent phytotoxicity.

Mass reproduction

First, choose the environmental conditions suitable for planting. Lemon is warm, resistant to shade, not cold, and also afraid of heat. Therefore, they are suitable for planting in subtropical areas with warm winter and cool summer. In areas with warm winter and small annual temperature difference, it is suitable for the annual average temperature to be 17 ~ 19℃, greater than or equal to 10℃, and the annual effective accumulated temperature to be 5200 ~ 6200. It can be planted in areas with annual rainfall 1200 ~ 1500mm and annual sunshine hours 1200mm. In the area where the annual average temperature is lower than 17℃, the area where the short-term low temperature is -5℃ and the periodic freezing injury, it is not suitable for economic planting in the open field. The requirements for soil and topography are not strict. Flat land and hilly slope are suitable for planting, but the slightly acidic soil with deep and loose soil layer, rich organic matter, strong water and fertility conservation, good drainage, low groundwater level and pH value of 5.5 ~ 6.5 is the best. Second, the propagation of lemon seedlings. Lemon rootstocks are commonly used abroad, such as lime, rough lemon and orange. Recently, grapefruit has proved to perform well. In China, Fructus Aurantii is often used as rootstock, and oranges, oranges, lemons (local lemons) and red oranges can also be used. Selecting excellent single scion; Grafting method: single bud cutting in spring; Bud grafting is adopted in autumn. 1. Soil preparation: it is advisable to choose a plot with loose soil, fertile soil and good drainage to build the garden. In autumn and winter, according to the row spacing of 3 m× 4 m, about 56 plants are planted per mu, and circular caves with a depth of 0.8 m and a width of 0.8 m can be dug in hilly and mountainous areas; Planting in lowlands can be shallower. 50 kg of soil miscellaneous fertilizer and compost, 0.5 kg of lime and 0.5 kg of calcium superphosphate are put into each pit, which are mixed with topsoil and applied in into the pit. Put 5- 10 kg of fully decomposed pig manure into the top floor, and when filling it back into the pit, it should be 20-30 meters higher than the ground to form a 0.8-meter tree tray. 2. Planting: It can be planted all year round in areas with uniform rainfall distribution or gardens with good water conservancy conditions and convenient irrigation. The planting period of lemon is generally divided into spring planting (February-March) and autumn planting (9-65438+ 10). Choose to plant on cloudy days, cover the roots with grass to keep moisture, and then water regularly according to the weather conditions to keep the soil moist.