The root is an important organ of the longan. Besides fixing the plant in the soil, absorbing water, mineral nutrients and a small amount of organic matter, as well as storing a portion of nutrients, it can also synthesize inorganic nutrients into organic substances, such as converting inorganic nitrogen. Amide, amino acids, proteins, etc. The root can convert phosphorus into nucleoprotein and fat, and can combine the carbon dioxide and carbonate absorbed in the soil with sugar, a photosynthetic product that moves down from the leaves, to form various organic acids, and send its transformation products to the ground. The Department participates in the photosynthesis process. Root can synthesize certain special substances, such as hormones (cytokinin, gibberellin) and other physiologically active substances, which regulate the growth of the shoot. Roots secrete acidic substances in the metabolic process, which can dissolve soil nutrients and convert them into easily soluble compounds. Root exudates can also lead soil microorganisms to the root distribution area, and combine nitrogen and other elements through microbial activity. Organic compounds are converted into nutrients that are easily absorbed by roots.
Longan root system usually consists of main root, lateral root and fibrous root. The main root is developed from the seed radicle. The coarser branches produced on it are collectively called lateral roots. The smaller roots formed on the lateral roots are called fibrous roots. The grafted, high-pressure breeding longan plants do not have main roots. The main root and all lateral roots can constitute the main skeleton of the root system, so it is also called the backbone root. The fibrous root is the root system that advances, lengthens, and expands the distribution range of the root system and forms the lateral branch-absorbing root. After growing for a certain period of time, these growing roots turn dark and become transitional roots, and they further develop into a root with a secondary structure. The main function of the root absorption is to absorb water and minerals from the soil and convert it into organic matter. It has a high degree of physiological activity. In the best period of root growth, its number can account for 90% or more of the plant root system. The amount of root absorption is closely related to the nutritional status of longan.
Longan has a strong root system and is a deep-rooted fruit tree. The roots of longan have vertical and horizontal roots. Roots with vertical roots that generally grow in a direction perpendicular to the soil surface, anchor plants in the soil, and absorb water and certain trace elements from deeper soil layers. Vertical soil depth depends on soil conditions, groundwater levels, and management practices. Most of the horizontal roots grow along the soil surface parallel to the surface, and the expansion range is mostly 1-2 times larger than the canopy, the most dense in the canopy coverage, and the absorption of water and minerals from the soil. The longan root system is distributed in the soil. According to Huang Jinsong (1962) observed in the red soil of Putian, the 28-year-long vertical root of Wulongling longan is more than 3 meters deep in the soil layer, and its vertical distribution is 180 centimeters deep, and it is still at 170 centimeters. There are 0.5-1 cm thick roots, 0.42 times the height of the tree; while the lateral roots are densely distributed between 5-50 cm. The same is red soil, and the soil layer is only 70 centimeters. Under it is a hard gravel layer, the vertical distribution of the root is only 80 centimeters, 0.23 times the height of the tree. Eighty percent of the longan roots are distributed at 0-40 cm, with the closest distribution at 10-30 cm. The horizontal distribution width is 2.8 times that of the canopy, and 80% of the root system is distributed around the crown. According to observations by Chen Wenxun (1964) in Fuzhou, roots of 15-year-old red-eyed longan can reach a depth of 5.45 meters and a horizontal distribution of 17.34 meters, and most of the absorption roots are distributed on 10-60 in deep, well-drained red soils. In the soil of the centimeters, the groundwater level at the gutter edge is high, and the root depth of the 17-year-old red-eyed longan is only 35 centimeters. In the red clay soil that is not yet fully weathered, the longan root is often distorted, and the absorption root is less, and the root cutting degree is different. Large; but in alluvial soils, there are many absorption roots, the difference in sharpness is small, and the horizontal root is 1.4-2.8 times larger than the crown. The longan trees planted with high-pressure seedlings have a vertical distribution of root depth no less than that of a real-life tree on a deep red soil slope.
Longan mainly relies on the absorption of roots to absorb water and minerals from the soil. The absorption of roots depends on the nutritional status of longan trees, and the roots of longan are distributed in the soil between 5-30 cm. Therefore, in addition to opening the park, longan garden soil management, we must dig large holes, layered enough Shiji longan deep roots, the normal longan orchard soil management must pay attention to cultivation layer fertilization, the implementation of tree disk soil, grass cover In winter, when the planting green manure is used to directly plow the entire garden, and when the soil is expanded and the soil is expanded, the coarse and miscellaneous fertilizers are applied to the bottom, and fine organic and inorganic fertilizers are applied to the plant to cultivate the soil.
Longan root system usually consists of main root, lateral root and fibrous root. The main root is developed from the seed radicle. The coarser branches produced on it are collectively called lateral roots. The smaller roots formed on the lateral roots are called fibrous roots. The grafted, high-pressure breeding longan plants do not have main roots. The main root and all lateral roots can constitute the main skeleton of the root system, so it is also called the backbone root. The fibrous root is the root system that advances, lengthens, and expands the distribution range of the root system and forms the lateral branch-absorbing root. After growing for a certain period of time, these growing roots turn dark and become transitional roots, and they further develop into a root with a secondary structure. The main function of the root absorption is to absorb water and minerals from the soil and convert it into organic matter. It has a high degree of physiological activity. In the best period of root growth, its number can account for 90% or more of the plant root system. The amount of root absorption is closely related to the nutritional status of longan.
Longan has a strong root system and is a deep-rooted fruit tree. The roots of longan have vertical and horizontal roots. Roots with vertical roots that generally grow in a direction perpendicular to the soil surface, anchor plants in the soil, and absorb water and certain trace elements from deeper soil layers. Vertical soil depth depends on soil conditions, groundwater levels, and management practices. Most of the horizontal roots grow along the soil surface parallel to the surface, and the expansion range is mostly 1-2 times larger than the canopy, the most dense in the canopy coverage, and the absorption of water and minerals from the soil. The longan root system is distributed in the soil. According to Huang Jinsong (1962) observed in the red soil of Putian, the 28-year-long vertical root of Wulongling longan is more than 3 meters deep in the soil layer, and its vertical distribution is 180 centimeters deep, and it is still at 170 centimeters. There are 0.5-1 cm thick roots, 0.42 times the height of the tree; while the lateral roots are densely distributed between 5-50 cm. The same is red soil, and the soil layer is only 70 centimeters. Under it is a hard gravel layer, the vertical distribution of the root is only 80 centimeters, 0.23 times the height of the tree. Eighty percent of the longan roots are distributed at 0-40 cm, with the closest distribution at 10-30 cm. The horizontal distribution width is 2.8 times that of the canopy, and 80% of the root system is distributed around the crown. According to observations by Chen Wenxun (1964) in Fuzhou, roots of 15-year-old red-eyed longan can reach a depth of 5.45 meters and a horizontal distribution of 17.34 meters, and most of the absorption roots are distributed on 10-60 in deep, well-drained red soils. In the soil of the centimeters, the groundwater level at the gutter edge is high, and the root depth of the 17-year-old red-eyed longan is only 35 centimeters. In the red clay soil that is not yet fully weathered, the longan root is often distorted, and the absorption root is less, and the root cutting degree is different. Large; but in alluvial soils, there are many absorption roots, the difference in sharpness is small, and the horizontal root is 1.4-2.8 times larger than the crown. The longan trees planted with high-pressure seedlings have a vertical distribution of root depth no less than that of a real-life tree on a deep red soil slope.
Longan mainly relies on the absorption of roots to absorb water and minerals from the soil. The absorption of roots depends on the nutritional status of longan trees, and the roots of longan are distributed in the soil between 5-30 cm. Therefore, in addition to opening the park, longan garden soil management, we must dig large holes, layered enough Shiji longan deep roots, the normal longan orchard soil management must pay attention to cultivation layer fertilization, the implementation of tree disk soil, grass cover In winter, when the planting green manure is used to directly plow the entire garden, and when the soil is expanded and the soil is expanded, the coarse and miscellaneous fertilizers are applied to the bottom, and fine organic and inorganic fertilizers are applied to the plant to cultivate the soil.
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