When is the best time to raise asparagus seedlings?
Asparagus can be raised at any time from March to September, but if it is to be harvested immediately to obtain higher total output and economic benefits, it can only be raised in March-April in spring and planted in May-June. From March to April, asparagus can be planted with small vegetables on the street in the greenhouse. Through proper liquid fertilizer management scheme and proper pest control, bamboo shoots can grow on land with sufficient nutrition and accumulate trace elements, which can be stored in roots. Bamboo shoots have a development period of more than 4 months underground, and the total output is generally above 1 000 kg, and the well-managed land is 1.08 kg.
Since asparagus is the best seedling in spring, what are the professional points of asparagus seedling raising in spring?
Key points of asparagus seedling raising technology in spring
1. Nursery site: Choose a soil layer with loose soil layer, rich soil layer and good air permeability, with standardized irrigation and sewage pipes, spacious geographical environment and good air circulation. Because asparagus and onion garlic are similar to Liliaceae food crops, in order to reduce pests and diseases, the previous crop is an uncomfortable cooperative asparagus seedling raising or onion garlic planting place.
2. Seedling raising methods and seedling raising stages: there are important seedling raising methods such as solar greenhouse seedling raising, small plastic greenhouse seedling raising, sunny seedling raising and open field seedling raising. Advocate nutrition bowl seedling. There are few injuries when planting, and the survival rate is high.
1. Seedling raising in solar greenhouse: You can raise seedlings in nutrient pots, which should be prepared before planting. The diameter of nutrient pots is about 8 ~ 10 cm. Mould soil is made of 30% mould soil, 35% ring fertilizer, 30% peat soil, 1.5% compound fertilizer, 0.5% urea solution aqueous solution, 1% phosphorus and potassium fertilizer and 20% potassium chloride, and a powder screening cosmetic bowl is placed in the border. Before placing, use 4 ~ 5 kg phoxim at seedling stage according to the ratio of 1 mu, and add appropriate amount of crushed stone to prepare medicinal soil, and spread it at seedling stage to avoid underground pests. A few days before planting, cover the film, cover the grass and raise the temperature.
2. Seedling raising in small plastic shed or sunny border: sunny border can be prepared before winter, which is generally 1.5m wide and 10 ~ 15m long. The north wall is higher than the road leading to the sunshine border, with a height of 10cm. Seedling raising can be carried out in a nutrient bowl, which is well prepared. Like the solar vegetable greenhouse, the finished nutrition bowl is placed on a sunny bed or in a small vegetable greenhouse.
3. Open-field cultivation and seedling raising: apply 3000-5000 kg compost and 50 kg Sackford compound fertilizer per mu, spread them evenly, develop 25 cm stably, turn over the soil finely, make the border width1.2-1.5 m ... and level the border surface to ensure that the soil layer is thin. Planting white asparagus, 60-70g per mu, accounting for 20-30m2 of nursery area; Green asparagus is sown at 90-100g per mu, and the nursery covers an area of 30-40m2.
Third, soaking seeds to promote teeth: asparagus seeds have thin and hard skin, strong cutin, difficult moisture absorption and slow germination. In order to promote seed germination, try to promote teeth before planting. Before sowing, the seeds can be dried in the sun for 1 ~ 2 days, then the chaff seeds and the long worm seeds are bleached with cold water, soaked in 300 times of 50% triadimefon for 10 ~ 12 hours, soaked in warm water at 30℃ ~ 35℃ for 2 days, and replaced with 1 ~ water every day.
4. Planting: Before planting, water should be absorbed from the seedbed in the nutrition bowl or in the open field seedling stage, and then a thin layer of soil should be spread after water seepage, with the row spacing of 65,438+00 cm in the open field seedling stage, or the backfill soil with a depth of 65,438+00 cm should be pierced with a knife, and bud seeds should be planted in the middle of the grid or in the nutrition bowl, covered with medicinal soil for 2-3 cm, and covered with a film after sowing. In open fields, seeds can also be sown or sown by cultivators.
5. Seedbed management scheme: 1. Temperature: the suitable temperature for asparagus germination is 25℃ ~ 28℃, and the temperature for seedling raising in small vegetable greenhouse or sunny bed is 25℃ ~ 28℃ during the day and 15℃ ~ 18℃ at night. After budding, water at 25℃ during the day, the lowest is not less than 8℃, the highest is not more than 30℃, and the highest is not more than 30℃. And gradually improve the air circulation to temper the seedlings and make them integrate into the external geographical environment. When the seedlings have more than three stems on the ground, they can be planted.
2. Fertilizer and water: Before budding, the soil at seedling stage should be kept wet and cold, otherwise it should be watered immediately. After emergence, the underground stems of seedlings are weak and should be irrigated immediately in case of drought. When the height of seedlings is about 10cm, analytical pure chemical liquid fertilizer can be applied once with water, such as composting human manure or biogas residue, or urea solution and potassium chloride with water. Fertilize the seedlings for 2 ~ 3 times, so that the seedlings can accumulate assimilated nutrients in the second half of growth and development, and form vigorous seedlings.
3. ridging and weeding: after budding, remove the agricultural film immediately. After the seedlings are sown together, the seedlings should be spaced apart, with the spacing of 7 ~ 10 cm. Weeding should be done frequently at seedling stage, and the soil should be loosened and shoveled in time. Properly turn over the soil to make the scales grow thick and prevent the seedlings from lodging. Seedlings can be sown when they reach the standard of sowing seedlings. Planting standard: the height of asparagus seedling is about 0.3M, with more than 3 aboveground stems and 5 underground storage roots.