Asparagus pollution-free production and cultivation techniques Sub-process (1) Soaking and germination: soaking in warm water of 25~30°C for 36~48 hours, change the water 2~3 times a day, rinse 1~2 times with water every day before dew-whitening, and sow 40%~50% of dew after sowing. (2) Seeding period: The general sowing time should be determined when the temperature is stable at 10°C. Yangshuo and arch shelters are used in cold areas. Generally, they can be planted from mid-February to mid-March, and the open seedlings should be planted in late April. after. (3) Method of sowing: Before planting, firstly fill the bottom surface with water, and then sow the seeds of the germination seeds in the center of the square according to the strain and line spacing of 10 centimeters. Then use a fine sieve to evenly sieve the soil on the surface. On the cover, it is 2 cm thick. In early spring, nursery should cover small sheds immediately after sowing to increase soil temperature. Preparation before the second planting Before planting, 3000 to 5000 kilograms of organic fertilizer per acre shall be applied to the middle of the field, deep-leveling land, white bamboo shoots shall be arranged at a 1.8-meter spacing, and green bamboo shoots shall be arranged at a spacing of 1.3-1.4 meters. The north-south direction or east-west line shall be determined according to the topography. To draw a straight line, dig a 0.45-meter-wide, 0.4-0.5-meter-thick planting trench along a straight line. When digging trenches, open 25 centimeters or more of mature soil and 25 centimeters or less of raw soil, and place the mature soil at the bottom when backfilling. . Three planting time When the seedling age reaches 60 to 80 days, it can be planted in Daejeon. Planting in spring can be carried out before sprouting sprouts. Summer colonization should try to avoid high temperatures and droughts. Four colonization methods After the planting ditch is opened, the seedlings are planted at the planting distance, and 1300-1500 strains of 0.25-0.3 meters per acre are planted in white bamboo shoots, 1600-2,000 strains are planted in 0.25-0.3 meters of green bamboo shoots per acre. When planting, a small 12 to 15 cm deep ditch can be opened in the planting ditch. After the seedling is placed in the planting ditch, it should be immediately covered with 4 to 5 cm thick and compacted, and then watered. Five field management after planting (a) tillage weeding. (B) Top dressing: After 1 month of colonization, apply topdressing nitrogen fertilizer once every 20 to 30 days, continuously applying 3 to 4 times, the principle is a small number of times, when a large number of new shoots of asparagus emerge, they can increase The amount of topdressing fertilizer is mainly composed of nitrogen, phosphorus and potassium compound fertilizers, and 30 kg can be applied per acre. (3) Water Management: For planting asparagus seedlings within one month, water should be poured once every three days and watered continuously for three to four times to ensure the survival of asparagus seedlings. (IV) Pest Control Common pests such as aphids, cockroaches, and ground tigers can be used to spray the rhizomes 2500 times. Common diseases such as asparagus stem blight, brown spot can use Opel or bacteria g 1500 times spray or smear the stem. Six field harvesting management (1) Clear Garden: Clear the residue and fallen leaves from the asparagus ground before harvesting bamboo shoots, remove the overwintering mother stems, and disinfect soils with heavier diseases in the field. This will facilitate cultivating bamboo shoots and prevent pests and diseases. (ii) Pre-harvest culturing: Before the spring tender stems grow out of the ground, white bamboo shoots should be used as ridges so that the tender stems will not grow out of the ground when they grow upward, so as to avoid discoloration and reduce the quality of asparagus. According to the conditions, green bamboo shoots do not require ridges. (3) Fertilization: For continuous harvesting of bamboo shoots, fertilizer should be topdressed once every 20 days, mainly composed of nitrogen, phosphorus and potassium compound fertilizers, supplemented with quick-acting fertilizers such as urea and potassium chloride, and applied by furrows or roots. (4) Moisture: Water must be taken during shoot-shooting to maintain a certain humidity in the soil so as to facilitate the extraction and growth of tender stems. Seven harvest (1) Shooting method: two kinds of parent stems and no parent stems. In the area where the asparagus has a dormant period, it is generally harvested in the spring and summer, and the method of leaving no mother stem is adopted. (b) Shooting Season Under plastic greenhouse cultivation conditions, bamboo shoots can be started in the middle of February in the second year after planting. In the field where bamboo stems are first collected and then bamboo shoots are harvested, it is generally not until mid-April that bamboo shoots are harvested. The harvest period is 90 to 150 days. (III) Harvesting time White asparagus sees easy-to-use discoloration and aging, which reduces quality, so it is necessary to shoot bamboo shoots in the early morning and early evening. When the temperature rises above 20°C, the shoots grow faster and can be harvested each morning and evening. (4) Shooting method 1. White asparagus: Observe carefully along soil ridges. Use a hand to gently open the soil on the side of a ridge with cracks or mounds. When the tip of the bamboo shoots is exposed to 5-7 cm, hold the upper end of the stem with your left hand and hold it in your right hand. Shoot bamboo shoot blade, according to the requirements of the length of the tender stems, insert the soil quickly cut off the tender stems, put away. 2. Green asparagus: The harvester patrolled the rows of asparagus and found that asparagus was cut directly from the asparagus with a bamboo shooter.
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