Longan (longan)

child Colong eye belongs to evergreen fruit trees, trees. Also known as guiyuan. The name Dimocarpus longana Lour.are native to Guangdong, Guangxi, Yunnan and other provinces (autonomous regions) and northern Vietnam. It has been cultivated in China for at least 2000 years. Sichuan has a history of about 2000 cultivation, while Fujian was introduced more than 1600 years ago. The cultivation area and yield of Fujian Long eye are the largest.is a long-lived fruit tree with a normal result period of nearly a hundred years. The height of the tree is 6-10m. The canopy is near the round head shape. Root system deep and wide, vertical root into the soil up to 2-3m, horizontal root expansion range is mostly 1-3 times larger than the canopy, absorption roots are concentrated in 40-50cm or more soil layer; The trunk is large and the outer skin is cracked. The top of the branches is strong, the branches are less, the quality is strong, the hard is brittle. Leaves are mostly even feather-like compound leaves, to live or resuscise each other, many are long oval shape, full-edge leather, leaf length 10-20cm, width 3-6cm, leaf surface green, back light green, leaf veins obvious. Flower sequence for the umbrella flower sequence, conical arrangement of mixed flower sequence, the number of flowers up to hundreds to twenty-three thousand, flowers small and dense, yellow and white, hairy, slightly fragrant, male flowers, female flowers for many, there are a few male and female flowers and perverted flowers. Fruit nucleo- fruit, flat or spherical, single fruit weight 10-15g. The peel is tawny brown, thin and smooth, the edible part is fake skin, milky or pale white, meaty with crisp, sweet. Seeds round to flat round, dark black or red-brown, sleek and shiny.root system in the annual cycle growth has 3-4 peaks, new root and new growth alternate with each other, June-August high temperature and humidity, root growth is the largest. Dragon's eye belongs to the type of flower bud differentiation in that year, 2-4 month bud form differentiation, 4-5 months flowering, a single flowering period of about 30-45 days, sitting fruit rate of about 10-20% of female flowers.long-eyed temperature, the average annual temperature of 20-22 degrees C is more suitable, the absolute low temperature in winter is lower than -5 degrees C, not suitable for cultivation. More drought-tolerant, quite adaptable to the soil, but with a deep soil layer, pH 4.5-6.5 of the sand loam or loam is good.china's dragon's eye varieties are rich in resources, including Fujian Province, the most cultivated varieties for Fuying, Wulongling, Dongbi.breeding methods are dominated by high-pressure bars and grafting. Grafting method mainly has a high tongue, cutting, leaning, grafting survival rate is high. Longan Garden should choose the south, hilly mountains to build horizontal terraces, plant distance of 5-8m. General spring and autumn planting, frost-damaged areas to spring planting as appropriate.long-eyed pests are most important for fruit moths such as lychee elephants and -printed sliers, curly leaves, peach moths, and lychee grey butterflies. The disease is mainly dangerous disease, followed by leaf spot disease, coal disease, fruit rot disease, root, stem disease and so on.is a famous special fruit in the tropical region of South Asia. The fructose content is as high as 12-23%,
vitamin
C and vitamin K content is also very high, every 100g of fruit contains vitamin C43.1-163.7mg, vitamin K196.5mg.