How to restore the growth of Magnolia planted for many years

Magnolia

Magnolia is an important early spring flowering tree species, its flowers are white and elegant, smell fragrant, flowers are large, deeply loved by people, is widely used in landscaping. Recently, a special reporter from China Garden Network saw a weak Magnolia in a certain community, with yellowish leaves and leaf spot disease, small and short branches, and not lush. It is understood that this magnolia has been planted for 12 years, although the growth is not prosperous, but has been strong alive, and flowering year after year, but the flowers are small, flowering period is also relatively short. According to the greening worker in charge of maintenance, the diameter at breast height of Magnolia was 6 cm when it was just planted. After many years of planting, it has not been thickened. The diameter at breast height at present and the diameter at breast height planted in that year have not changed significantly, becoming a veritable "small old tree".

What causes Yulan to become a "small old tree"? Chinese garden network special correspondent and local technicians and maintenance workers together to find the reason. According to the observation of special reporters of China Garden Network, Magnolia is planted in front of a five-story building, belonging to typical leeward sunny, surrounded by cold-season lawn, Magnolia is planted in front of Euonymus model pattern, Magnolia planted next to Trifolium plum and Rosa chinensis, in addition to Magnolia, other plants are growing vigorously.

According to greening maintenance personnel, due to years of planting, little fertilizer is applied to this green land, including Magnolia. Thawing and freezing water are poured on trees every year. At other times, magnolia is watered when lawn is watered. Magnolia is not watered separately. Considering that Magnolia leaves are small and yellow, we first start from the perspective of soil analysis. After observation, planting soil is black soil, partial sticky, and more hardened. After laboratory determination of the salt content and PH value of the soil, the salt content is 0.2%, PH value is 8.8, belonging to mild saline-alkali soil. China garden network special reporter to soil deep excavation, no brick tile and other magazines, according to the greening construction responsible person at that time said, green grass roots are very clean, has been excavated to the old soil. Therefore, we can judge that soil structure is not the cause of Magnolia into "small old trees", soil viscosity, hardening and salt content, PH value is the main cause of Magnolia into "small old trees".

Why do you say that? First of all Magnolia is like permeability good sandy loam, soil fertility also has requirements, it does not like barren land. In addition, Magnolia likes acidic soil and can grow normally in neutral to acidic soil. However, this piece of land belongs to mild saline-alkali soil, so it affects the growth of Magnolia. Its leaves are yellow and smaller due to saline-alkali soil.

Find out the reason why Magnolia became a "small old tree", we formulated rescue measures. Everyone agreed that Magnolia missed the best time to grow, the tree thickening growth speed will be very slow, but through a series of measures, Magnolia can restore growth, luxuriant crown, increase flowering. First, it is necessary to strengthen the management of the soil. The planting soil should be loosened regularly. If necessary, the surface soil can be replaced to a depth of 30 cm. The replacement soil should be sandy. Second, every year to irrigate frozen water and thaw water, usually alone to magnolia watering, drought can be poured once every half month, the rest of the time poured once a month permeable. Third, strengthen the management of fertilizer, apply nitrogen fertilizer to plants after flowering in spring to promote the growth of branches and leaves, apply phosphorus and potassium fertilizer in autumn, irrigate frozen water in late autumn, use cow manure or dried chicken powder, and also apply some rotten leaf fertilizer. Fourth, every two months to irrigate magnolia alum fertilizer water.

How to restore the growth of Magnolia planted for many years

Magnolia

Magnolia is an important early spring flower species, its flowers are white and elegant, fragrant smell, large flowers, deeply loved by people, is widely used in landscaping. Recently, a special reporter from China Garden Network saw a weak Magnolia in a certain community, with yellowish leaves and leaf spot disease, small and short branches, and not lush. It is understood that this magnolia has been planted for 12 years, although the growth is not prosperous, but has been strong alive, and flowering year after year, but the flowers are small, flowering period is also relatively short. According to the greening worker in charge of maintenance, the diameter at breast height of Magnolia was 6 cm when it was just planted. After many years of planting, it has not been thickened. The diameter at breast height at present and the diameter at breast height planted in that year have not changed significantly, becoming a veritable "small old tree".

What causes Yulan to become a "small old tree"? Chinese garden network special correspondent and local technicians and maintenance workers together to find the reason. According to the observation of special reporters of China Garden Network, Magnolia is planted in front of a five-story building, belonging to typical leeward sunny, surrounded by cold-season lawn, Magnolia is planted in front of Euonymus model pattern, Magnolia planted next to Trifolium plum and Rosa chinensis, in addition to Magnolia, other plants are growing vigorously.

According to greening maintenance personnel, due to years of planting, little fertilizer is applied to this green land, including Magnolia. Thawing and freezing water are poured on trees every year. At other times, magnolia is watered when lawn is watered. Magnolia is not watered separately. Considering that Magnolia leaves are small and yellow, we first start from the perspective of soil analysis. After observation, planting soil is black soil, partial sticky, and more hardened. After laboratory determination of the salt content and PH value of the soil, the salt content is 0.2%, PH value is 8.8, belonging to mild saline-alkali soil. China garden network special reporter to soil deep excavation, no brick tile and other magazines, according to the greening construction responsible person at that time said, green grass roots are very clean, has been excavated to the old soil. Therefore, we can judge that soil structure is not the cause of Magnolia into "small old trees", soil viscosity, hardening and salt content, PH value is the main cause of Magnolia into "small old trees".

Why do you say that? First of all Magnolia is like permeability good sandy loam, soil fertility also has requirements, it does not like barren land. In addition, Magnolia likes acidic soil and can grow normally in neutral to acidic soil. However, this piece of land belongs to mild saline-alkali soil, so it affects the growth of Magnolia. Its leaves are yellow and smaller due to saline-alkali soil.

Find out the reason why Magnolia became a "small old tree", we formulated rescue measures. Everyone agreed that Magnolia missed the best time to grow, the tree thickening growth speed will be very slow, but through a series of measures, Magnolia can restore growth, luxuriant crown, increase flowering. First, it is necessary to strengthen the management of the soil. The planting soil should be loosened regularly. If necessary, the surface soil can be replaced to a depth of 30 cm. The replacement soil should be sandy. Second, every year to irrigate frozen water and thaw water, usually alone to magnolia watering, drought can be poured once every half month, the rest of the time poured once a month permeable. Third, strengthen the management of fertilizer, apply nitrogen fertilizer to plants after flowering in spring to promote the growth of branches and leaves, apply phosphorus and potassium fertilizer in autumn, irrigate frozen water in late autumn, use cow manure or dried chicken powder, and also apply some rotten leaf fertilizer. Fourth, every two months to irrigate magnolia alum fertilizer water.

Planting Technique of Magnolia

Magnolia, also known as Magnolia, Yutangchun and Muhuashu, is a deciduous tree belonging to Magnolia of Magnoliaceae. It is native to Anhui, Zhejiang, Hunan, Hubei, Guizhou, Guangdong, Shanxi and other regions. It is also widely cultivated in Beijing and the south. Magnolia white color, flower big flavor fragrance, is an important garden early spring flower species, deeply loved by people, and begonia, spring, peony, osmanthus planting, auspicious, rich meaning, and "Yutang spring rich" reputation. The cultivation and management techniques of Magnolia are described as follows for reference only.

Ornamental tree species common in the genus

Magnoliaceae Magnolia about 90 species, about 30 species in China, common species and cultivated varieties in the garden are: Magnolia Huang, Magnolia Purple, Magnolia Wang Chun, Magnolia Erqiao, Magnolia Purple and so on.

Selection of planting environment

Magnolia love light, young trees more shade, not resistant to strong light and sun, too strong light or sun, easy to make trees burned. Magnolia can be planted in the lateral light environment, planted under the tree or in the shade will grow poorly, thin tree, sparse branches, small leaves and yellow, no flowers or small flowers; Magnolia is more cold-resistant, able to withstand short-term low temperature of-20℃, but should not be planted in the wind, otherwise easy to shoot, in Beijing area leeward sunny place without winding measures can safely winter in the open field; Magnolia likes fertile, moist, well-drained slightly acidic soil, but can also grow normally in mild saline-alkali soil (pH 8.2, salt content 0.2%); Magnolia is a fleshy root, afraid of ponding, planting terrain should be high, planting in low-lying places is easy to rot roots and lead to death; Magnolia planting land soil permeability is also good, planting in clay is poor, in sandy loam and yellow soil growth best.

Digging and planting of seedlings

Magnolia is not resistant to transplantation, generally 10 to 15 days before germination or flower just withered and not open leaves when transplanting is ideal. 4 to 5 days before the seedlings to irrigate a permeable water, this can not only make the plants absorb sufficient water, conducive to survival after planting, but also conducive to digging seedlings into the soil ball. In the excavation to minimize damage to the root system, root wounds must be smooth, in order to facilitate wound healing, but also need to pay attention to: no matter how large the size of the seedlings should be with soil ball, soil ball diameter should be 8 to 10 times the diameter of the seedlings, not too small, too small will not protect the root system. After the earth ball is dug, it should be tied up with straw rope to prevent it from scattering during transportation.

Before planting, the tree pit should be dug well. The tree pit should be large rather than small. If the tree pit is too small, it will not only be troublesome to plant, but also unfavorable for root growth. The soil at the bottom of the tree pit should be mature soil. If the soil is too viscous or pH value or salt content exceeds the standard, it should be treated or improved. Cultivated soil permeability must be good, soil fertility must be sufficient, to be able to supply enough nutrients to plants, soil can not have bricks, tiles, lime and other impurities. Planting depth should be appropriate, generally speaking, planting depth can be slightly higher than the original soil ball 2 to 3 cm, too deep is easy to produce stuffy buds, too shallow will make the roots bare, but also easy to be blown down by the wind. Large-sized seedlings should be set up in time with triangular supports to prevent them from being tilted by wind; after planting, they should be watered immediately, watered twice after 3 days, watered with three water after 5 days, and then entered into normal management. If the seedlings planted with buds, buds should be cut off to prevent flowering and fruiting consume a lot of nutrients and affect the survival rate.

water and fertilizer management

Magnolia has neither waterlogging nor drought tolerance, so the principle of "liking wet and fearing waterlogging" should be strictly observed in cultivation and maintenance. In the process of cultivation and maintenance, many people think that Magnolia is afraid of waterlogging and should be watered as little as possible. This understanding and practice is very wrong, because Magnolia is afraid of waterlogging and does not mean that it likes drought. It itself likes humid environment. In terms of water management, it is necessary to master the degree that the soil cannot be too dry or too wet. After years of cultivation practice, the author thinks that in the cultivation process, the soil should be kept moist without ponding. During the conservation process, newly planted Magnolia should keep the soil moist, which is also an important measure to ensure its survival rate. To enter the normal management of magnolia watering, early spring green water, early winter antifreeze water is indispensable, but also to irrigate fully, in the growing season, can be irrigated once a month, rainy season should stop watering, after the rain to timely drainage, to prevent due to ponding caused by rotten roots, in addition, should also be timely loose soil preservation. It should be noted that irrigation should also be carried out in time during the rainy season and drought period. Water shortage not only affects the vegetative growth of plants, but also causes flower buds to fall off or shrink, affecting the flowering of the following year.

In addition, in poor site conditions, especially hardening area, green space area of small environment planted Magnolia, in the case of continuous high temperature and drought weather, watering at the roots should also be given foliar spray, spray should pay attention to the degree of atomization, the higher the degree of atomization, the better the effect, spray time to 8:00 in the morning and 6:00 in the evening after the best effect, noon strong light can not be carried out. For Magnolia suffered from waterlogging, it is necessary to save it at the first time. First, the accumulated water should be removed in time. Second, shade the tree body, especially to prevent the sun from shining in the west. Third, cut off some leaves and buds.

Magnolia love fertilizer, in addition to planting in the application of base fertilizer, fertilizer should be applied every year thereafter, sufficient fertilizer can make the plant grow vigorously, leaves green hypertrophy, not only with more buds, but also large flowers, long flowering and fragrant. Fertilizing Magnolia denudata is carried out four times a year, i.e. applying nitrogen, phosphorus and potassium compound fertilizer once before flowering, which can not only improve flowering quality, but also facilitate spring growth; applying nitrogen fertilizer once after flowering, which can improve plant growth and expand nutrient area; applying phosphorus and potassium compound fertilizer once in July and August, which can promote flower bud differentiation and improve lignification degree of new branches; Before winter combined with irrigation winter water and then apply a decomposed fermented fertilizer, this fertilizer can not only improve the activity of the soil, but also effectively improve the ground temperature, and the amount of fertilizer should be large should not be small. In addition, if the seedlings planted in the same year grow poorly, they can be sprayed with 0.2% potassium dihydrogen phosphate solution, which can effectively enhance the tree vigor.