How to plant a walnut tree
Cultivating strong seedlings is a prerequisite for ensuring normal results after the establishment of the park. In the nursery, we need to grasp the following aspects. 1. Cultivating rootstocks: Hebei and Shandong mostly use ordinary walnut seedlings as rootstocks. In addition, there are many wild walnut resources that can be used in various places. The wild fruit is a family fruit. Walnuts left for seeding should be harvested properly. According to the test, the harvested walnuts in early September had a germination rate of less than 50%, while the walnuts harvested from late September to early October had a germination rate of more than 90%. After harvesting, peel off the green skin, even if it is dried, treat the sand before the soil is frozen. Use salt water to select the plump seeds and lay them layer by layer in layers of wet sand and a layer of walnuts in layers of 15 centimeters, until they reach 20 centimeters from the pit. Then, the pit is laid flat with wet sand and ridged with earth. In order to vent the pit, a bundle of straw should be placed in the center of the pit. Check 1-2 times before taking seeds in spring. Without the dry seeds of the sand, germination should be carried out before spring sowing. Soak the seeds with cold water for 5-7 days, change the water once a day, or soak the seed for 10-13 days with 10% lime water, stir 1-2 times a day, then remove and expose for several hours, and then place the temperature control at 20-25 degrees. Hot beds or fire pits germinate, usually about a week to Qiqimiao. Seeding can be done as soon as the soil is thawed. Mushi 5000 kg of organic fertilizer is planted in the nursery and then leveled to make a 1-meter-wide beam for drilling. Row spacing 30 cm, spacing 15-20 cm, ditch depth 10 cm, cover 5-7 cm. When planting, the suture is perpendicular to the ground, and the tip of the plant is good to the side. The amount of seed per acre is about 110-130 kilograms, and the seedling yield is 7000-8000 strains. After emergence, fertilizer and water management should be strengthened, weeding and weed control, and pest and disease prevention at the seedling stage. Some dry and dry areas are often used to build live gardens, sowing 2-3 seeds per hole until the rootstock grows 1-2 years after grafting. When digging, dig 25-30 cm deep pits, dig loosely and apply organic fertilizer, and sow after planting. The seed is covered with 12 cm of soil, and a small pit of 14-16 cm deep is reserved above it so that the water can be preserved and the seedlings are favored. 2. Grafting: The most common ones are branching and budding. (1) Branching: Walnut branches are suitable for the period from the rootstock to the early flowering stage. It is about mid-April in North China. The scion shall use the middle and lower part of the robust development branch or long fruit branch, and then cut into the bud branch before cutting it in the 95-100 degree paraffin wax. Grafting methods can be used for splicing and skinning. After that, we must pack a strict interface. In order to prevent the impact of wound flow on the survival rate of grafting, the rootstocks can be treated with water before connecting. It is possible to knuck several knives diagonally around the base of the rootstock and go deep into the xylem to allow the wound fluid to flow from the blade. How much the knife edge should be determined according to the thickness of the rootstock and the wound flow rate when grafting, generally 3-5 knives can be. (2) Budding: North China is conducted from mid-July to mid-August. The budding splice is best followed by picking, and the scion cut off immediately removes the leaves. Budding methods often use T-shaped and square buds. In recent years, the use of T-shaped buds has worked well. This method can make the micro-injury flow from the lower part of the bud to cross the transverse incision, thereby overcoming the other bud graft method erosion erosion buds, so that the survival rate was significantly improved. (3) After the management: After grafting and survival, it is necessary to pay attention to timely untie and remove. After the scion sprouts, 10-15 kilograms of urine fertilizer can be traced per acre. Each fertilization must be combined with tank water. When the seedlings grow to 20 cm, they must be erected to prevent wind damage. In addition, pests and diseases should also be promptly controlled to ensure the normal growth of seedlings. Insect net greenhouse also known as plant and vegetables greenhouse net. Used for prevent the insect fly into the greenhouse during the plant growing, and cover the plants. Key off the approaches that the pests (adult insect) breeding. Effective control of the spread of all kinds of harmful pests spread, such as Cabbage caterpillar, diamondback moth, aphids, flea beetles, Sweet agnates, American leaf miner, literal etc and prevent the harmful of virus spread. Significantly reduced the use of chemical pesticides, so that the planting vegetables good-quality and health. Greenhouse Insect Net,Insect Mesh Netting,Insect Mesh JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , http://www.spgreenhouse.com