The latest course on planting techniques and methods of coral trees

Coral trees, also known as French holly and early grasses, are evergreen shrubs or small trees of the genus Ninjuriaceae. They are native to China and are also distributed in India, Myanmar, Thailand and Vietnam. They have strong fire resistance and can be used as forest fire barriers. The wood is soft and can be used as a hoe handle. It is often renovated into green walls, green doors and green corridors in regular gardens. Let's take a look at the planting techniques of coral trees.

Growth habits of coral trees

Coral trees grow in shady places beside streams in dense forests in valleys, sunny places or flat shrubs in sparse forests, and like warmth, cold tolerance and light tolerance. It grows rapidly and exuberantly in moist, fertile neutral soil, and can also adapt to acidic or slightly alkaline soil. It has developed root system, strong sprouting ability, pruning resistance and strong resistance to toxic gases.

Seedling raising techniques of Coral trees

1. Propagation methods: coral trees propagate mainly by cutting or sowing, and cutting can be carried out all the year round. Spring and autumn are better, with fast rooting and high survival rate. The main method is to select strong, straight and straight stem nodes. In May-June, cut mature branches with a length of 15cm to 20cm, plant them in a nursery or sand bed, take roots 20-30days after cutting, and transplant them into the nursery in autumn. The seeds were sown in August, sowed in autumn or in spring following winter sand storage, and germinated and grew into seedlings 30-40 days after sowing.

2. Nursery site selection: nursery land should be selected in areas with leeward and sunny direction, convenient transportation, convenient drainage and irrigation, and complete ditch and ditch electricity facilities. Sandy loam or loam with flat terrain, deep soil layer, fertile soil, good drainage and sufficient light from slightly acidic to slightly alkaline (pH6.5~7.5). The groundwater level should be below 1.5m.

3. Soil preparation and ploughing: before raising seedlings, nursery land should be carefully prepared, deep ploughing and finishing, remove weeds and roots, improve soil, improve soil fertility, maintain soil moisture, and create an environment for seedling growth. The winter fallow land should be ploughed and raked three times, with a depth of 25 centimeters and 30 centimeters, and the spring ploughing land should be ploughed and raked twice, and the depth of ploughing should be 20 centimeters.

4. Soil improvement: for barren soil, organic fertilizer should be applied year by year, lime, plant ash and bone powder should be applied properly in acidic soil, acid fertilizer should be applied in alkaline soil, sand loam should be mixed in clayey soil, and burning soil should be increased in sandy soil. Before making the bed, 15000 ~ 30000 kg / ha of rotten organic fertilizer, 1500 ~ 2250 kg / ha of rotten cake fertilizer, 375kg / ha of phosphate fertilizer or compound fertilizer, combined with ploughing, were applied to the tillage layer.

5. Soil treatment: before raising seedlings, the soil should be treated with disinfection and pest control. Ferrous sulfate can be used for sterilization. 20 days before planting, 22.5-30kg / ha of zinc benzoate was applied or used, and mixed with appropriate amount of fine soil to make poisonous soil and sprinkle it in the soil. 50% phoxim EC 20 kg / ha can be used to mix fine soil to make poisonous soil and sprinkle it in the soil.

6. bed weeding: the specifications of the seedbed are determined according to the management requirements and the situation of the round. generally, the width of the seedbed is 100-120 cm, the height of the bed is 20-30 cm, the aisle width is 45-50 cm, and the length of the seedbed is generally 10-20 meters. Make the bed in the east-west direction, the bed surface is flat, the center is higher than both sides, so as to avoid local stagnant water. After the bed was made, 1125-1350 mg / ha was sprayed on the soil surface to kill weed seeds. The soil should be kept moist before and after spraying to ensure the efficacy. After application, if it rains, pay attention to drainage to avoid drug damage.

Planting techniques of coral trees

1. Transplant pruning: the small seedlings dug up are transplanted with lodging soil every year from March to April. The big seedlings need to be transplanted with soil balls, and they must be transplanted along with the seedlings. After transplantation, they must be fully watered and watered. In case of drought years, must be often watered to ensure survival, after survival can be topdressing 1 or 2 times to promote the growth of seedlings. In addition, we should also do a good job of shaping and pruning every year, which can be trimmed according to the requirements of green wall, hedge, green door, green corridor and so on. Potted coral, the seedlings can be transplanted into the pot, and then watering, topdressing, pruning, plastic and other daily management work.

2. Timely irrigation: coral trees grow vigorously and absorb a large amount of water, so it is appropriate to choose fertile and moist soil for cultivation. After initial planting, they should be watered or irrigated properly according to soil or weather conditions. Irrigation should be flexibly controlled according to local climate, site conditions, soil moisture and seedling growth. Irrigation, spraying and irrigation ditch water can be used, and should be carried out sooner or later. In the early stage of seedling growth, there should be a small number of times from April to May, and one-time watering from June to August in the fast-growing period. irrigation should be controlled in the later stage of seedling growth, except for special drought.

3. Weeding and loosening soil: weeding should grasp the principles of early weeding, small weeding, except and no damage to seedlings, keep weeds in the nursery, and artificial weeding should be carried out after rain or watering and drying. Actively promote chemical weeding, walkways can use Roundup or glyphosate, but to prevent spraying on seedlings. Grass grass is tender in the early stage of Gramineae weeds, can be used to cover grass or fine grass grass gram, the first use of herbicides, should be tested before use, in order to avoid drug damage. Combine weeding to loosen the soil, 4-6 times a year, from shallow to deep, near the seedling root, shallower among the five plants, and deeper between the rows.

4. Fertilization and shaping: about 750 kg / ha of compound fertilizer and 300 kg / ha of urea can be deeply applied in the rainy season. Urea can be applied several times from May to August every year, and the supply of water and fertilizer is sufficient and the growth is exuberant. The coral tree is strong in sprouting and tillering, can naturally form a barrel-shaped crown, and the lower branches are not easy to die, and generally can not be pruned. If it is used as a hedge, it should be pruned 2 or 3 times before spring germination and growing season.

5. disease control: coral root rot and black rot can be sprayed or irrigated with 1000 times of acetic acid solution, and stem rot, leaf spot and corner spot can be sprayed with 75% chlorothalonil wettable powder.

6. pest control: the main insect pests of coral trees are mainly scale and stinging moths, such as scale, blow cotton scale, Kangshi pink scale, flat moth and so on.

① artificial control: winter or early spring combined with pruning, cutting off insect branches and burning, in order to reduce the number of overwintering insect population. Scale insects on individual branches or leaves can be gently brushed off with a soft brush or daubed with kerosene with a brush. Diamondback moths can make use of the phototaxis of adults and set up black light to trap and kill adults.

② drug control: scale can be sprayed with contact insecticides during the incubation period (February to April every year), such as 2.5% deltamethrin (dimethrin) 3000 × 5000 times, 80% dichlorvos EC, 3000 times fenitrothion EC, etc., and then sprayed once every 7-8 days, a good control effect can be achieved. During the insect fixed parasitic wax secretion period (February to April every year), internal absorbent scraping and drying or root application and irrigation should be selected for prevention and control, and the commonly used agent is 50% zinc parathion EC 5% 10 times. The resistance of diamondback moth larvae is weak, and it can be sprayed with 90% trichlorfon, 80% dichlorvos EC, 50% zinc parathion EC 1500-2000 times, or 5000 times of methyl pyrethroid pesticides. Red spiders can be sprayed with 1000 times of triclofenac wettable powder, and aphids, leafhoppers and shell insects can be sprayed with 1000 times of fenitrothion EC.