Hibiscus henryi (Latin name: Hibiscus henryi). A kind of "flower palm", whose wood grain looks like a ghost face, is also a kind of raccoon spot, also known as "flower raccoon" and rosewood. The old man tattooed his fist, while the young man straightened it. The wooden knot pattern is as dizzy as money, with bright colors and clear and beautiful texture, which can be used as furniture and stationery. Rosewood can also be divided into old pears and new pears. Old pear, also known as Huang Huali wood, is pale yellow to purple, with clear and beautiful texture and rich fragrance. The wood color of the new pear is red and yellow, and the texture color is slightly worse than that of the old pear. In the national standard of mahogany, rosewood is classified as rosewood, and many merchants call it "rosewood" for this reason. Rosewood can be divided into seven varieties: Vietnamese rosewood, Andaman rosewood, hedgehog rosewood, Indian rosewood, big fruit rosewood, capsule rosewood and black-footed rosewood.

cultivation techniques

Seed collection and selection

When collecting seeds, we should choose plants that are over 15 in age, grow healthily, develop normally, have straight stems and are free from pests and diseases as mother trees. Generally speaking, a large number of Pterocarya stenoptera fruits ripen from June to February in 5438 every year. When the peel changes from yellow-green to yellow-brown, the seeds can be collected. After the fruit is harvested, it must be fully dried, the pods must be crushed, and the seeds can be obtained after removing the edges of the pods. Generally, the emergence rate of seeds is about 70%, with an average of 3550 ~ 4500 seeds per kilogram. The seeds of Pterocarya stenoptera can't be placed for a long time, so it's better to sow with the harvest, otherwise it will affect the germination rate and germination rate of seeds.

grow seedlings

Before sowing, the seedbed should be leveled and sprayed with potassium permanganate or thiophanate for disinfection.

Pears sprout easily. Soak in clear water for 24 hours before sowing, take it out and dry it, then spread it evenly on the bed surface, cover it with fine soil of about 1cm, cover it with a thin layer of grass, or build a shade shed with a shade net for shade. After sowing, water it in the morning and evening, keep the seedbed properly moist and germinate in about half a month. The germination rate of fresh and full seeds is above 90%.

Seedling transplantation

When cotyledons turn green and true leaves begin to grow (about 20 ~ 30 days after seeds germinate), they can be transplanted into nutrition bags.

Seedling management

About half a month after transplanting, dilute urea can be applied frequently to keep enough water and nutrients, and attention should be paid to the prevention and control of pests and diseases, mainly by spraying thiophanate or chlorothalonil every 7 ~ 10 days. If properly managed, 1 year-old Miao Di diameter can reach 1.5 ~ 2.0 cm. When the height of seedlings is 50 ~ 60 cm, low-cut seedlings are used for afforestation on the mountain. Pterocarya stenoptera has low branches and thick lateral branches, so attention should be paid to shaping and pruning when it tends to cultivate excellent trunk shape. Palm trees are prone to lodging. Tending management should also insert bamboo bundles beside seedlings to promote the vertical growth of trunk and form excellent dry wood.

Afforestation technology

Afforestation site selection: barren hills and wasteland below 600m above sea level and sunny and semi-sunny slopes of logging land can be used for afforestation. Land preparation: Land preparation should be carried out in the winter one year before afforestation, so that the soil can be fully weathered and some pests can be eliminated. It is best to use mountain refining operation, and horizontal belts should be set up when the slope of the mountain exceeds 20. The afforestation adopts hole planting, and the specification is 50cm×50cm×40cm. Afforestation with nutritious cup seedlings has high survival rate and preservation rate (above 90%PA).

Planting density: the plant spacing depends on the site conditions, where water and fertilizer conditions are good, 3m×3m, and in arid areas, 3m×2m or 2m×2m. Sufficient base fertilizer should be applied, 2.5 ~ 5 kg of farmyard manure can be applied to each hole, and more than 2509 grains of nitrogen, phosphorus and potassium fertilizer can be mixed.

It is best to choose the afforestation season in March and April, and no later than June. It should be planted after light rain or rain. 10 days ago, stop fertilization and reduce watering times, classify seedlings according to size and spray pesticides to control pests and diseases. When planting, carefully tear off, straighten and compact the film bag. After afforestation, the seedlings in the current year are small and easy to be inhibited by weeds, and tending in the current year is the key to the success of afforestation. Weeding and tending should be done in time after two months of cultivation, and weeding and loosening the soil should be done again before the weed seeds mature in autumn.

control of insect

The main diseases are moles and anthrax. Pear seedlings and young trees are prone to black spot disease, which mainly appears on leaves, branches and pods and spreads very fast in rainy season. In severe cases, all leaves are black, which leads to a large number of leaves falling off, which seriously affects the growth of young trees. Control measures: spray with chlorothalonil or 5% thiophanate methyl 500 times solution, 1 every 7 days 1 time, 2-3 times. Anthracnose may also occur on the tender leaves and shoots of pears. On the leaves, there are round brown spots with black spots. On the shoots, the diseased area appears black and gradually dries out. Control measures: Use chlorothalonil or 70% zineb, 1 once every 7 days, 2-3 times.

Main pests: Anoplophora maculata, grasshoppers, leaf-eating beetles, etc. The damage of marmots often occurs in young artificial forests, with a mortality rate of 40 ~ 50%. Young trees often collapse or die after being killed. Prevention and control measures: the adult can knock the tree to the ground to death, or the larval animal can inject 90% trichlorfon or 50% phoxim with a syringe 300-400 times, and then seal the orifice with clay. The damage of grasshoppers and leaf-eating beetles in young forests mostly occurs in summer. Control measures: 90% trichlorfon or dimethoate should be applied to the foliage of crown.