Root germination method
Choosing a land as a border Choose a nursery that is leeward and sunny, with a flat terrain, and good drainage and irrigation as a hotbed. Before heading, apply 1,000 kg of organic fertilizer per acre, 50 kg of ammonium bicarbonate and 50 kg of superphosphate, after plowing and raking, sprinkle 100:1 bran and methamidophos bait on the head of the head to prevent mole crickets from underground Pest damage. The border area faces north-south, 1.5 meters wide, about 12 meters long, and the border area is 50 cm wide. The border area is level with the ground.
Cut the roots and discharge the annual seedling roots of excellent varieties such as Lu Ci 74068 with a stem thickness of 0.2 ~ 0.5 cm, cut into 3 ~ 5 cm long roots, and divide the roots into three groups according to the roughness, each 100 roots 1 bundle, store in wet sand for later use, so as not to lose water to the roots and lose germination ability; it can also be cut, graded, and rooted. In the first ten days of March, evenly discharge the roots in the dug hotbed, and arrange 300-350 roots per square meter without overlapping each other. After sowing, spray enough water and cover with 1 cm thick fine soil, and then build an arch to cover. Good plastic film, seal all around and dug drainage ditch.
Hotbed to promote germination After the roots are covered with film, the bed surface temperature is kept at 20～25℃ to promote germination. Sprouts begin to emerge in about 15-20 days, and all seedlings emerge in about 30 days. The early temperature is low, and water spraying in the border bed is not suitable; after late March, the temperature gradually rises. When the border bed temperature exceeds 30 ℃ at noon, attention should be paid to proper ventilation and cooling to prevent sunburn on the seedlings. After the seedlings emerge, you can spray water to moisturize, and choose to soak in the afternoon on a sunny day. Pay attention to ventilation and adjust the bed temperature and humidity to keep the seedlings growing normally. When the height of the seedlings is more than 5 cm, the seedlings should be air-cured and tempered; the film should be uncovered all day two days before transplanting to make the sprouts adapt to the field climate.
Seedling transplanting and raising seedlings require flat ground and convenient irrigation and drainage. Before transplanting, 1000 kg of organic fertilizer, 50 kg of ammonium bicarbonate and 50 kg of superphosphate shall be applied per mu before transplanting. After full mechanical tillage and rake leveling, small high ridges with a width of 60 cm are used. The furrow is 30 cm wide and 25 cm deep, and the ridge length is about 25 meters. Transplant when the seedling is 5-10 cm high. Because the roots germinate unevenly, the sprouts should be transplanted in batches, and the seedlings or ungerminated roots can continue to germinate in the hotbed. Transplanted at the end of April *** early May. It is better to transplant on a cloudy day; on a sunny day, transplant after 3 o'clock in the afternoon, avoiding the high temperature at noon, so as to prevent the sprouts from losing water and affecting their survival. When transplanting, spray water in the border first, then use a small shovel to bring the seedlings to cut soil blocks and put them in the pot; if the soil blocks are scattered, plant the sprouts immediately. When planting, use a small shovel to dig a small hole with a depth of 5 to 8 cm in a straight wall. The sprouts are planted against the straight wall and watered immediately after covering with soil. Plant two rows per ridge, the row spacing is 45 cm, and the plant spacing is 30 cm. 4900 plants per mu are planted.
Seedling management watering once a day within a week after transplanting to ensure survival. After the seedlings survived in mid-May, apply 15 kg of urea per acre to bleed the water again; in mid-June, apply 15 to 20 kg of urea per acre to bleed the water. Loosen the soil and weed in time to promote the growth of seedlings. Spray 100 times of oxidized dimethoate emulsion in time to prevent aphids from harming the seedlings when the sprouts are green and live; spray again during the vigorous growth period. In this way, it can be ensured that the height of the seedlings out of the nursery is above 2.5 meters, and most of the seedlings can meet the needs of tree planting and afforestation.