Growing leeks in greenhouses

Properly cultivating seedlings

Leek seedlings grow slowly and should be sown early, preferably from late March to late April. After soaking and accelerating germination, wet seeding is used to spread the seeds in the seedling border. Cover the soil twice, with a thin layer of soil for the first time, and then cover the soil for the second time after the moisture returns. The total thickness of the soil is 2 centimeters, and the seed amount per mu is 6 to 8 kilograms. . After covering with soil, cover with mulch to increase temperature and moisture, and remove the mulch after seedlings emerge. Generally, 1 mu of seedlings can be planted in 7 to 9 mu of vegetable fields.

Seedling field management

Pour the leek seedlings about 5 cm high with light water and loosen the soil in time. After 10 cm, decomposed manure can be applied in combination with watering or urea can be applied 2 to 3 times, and 0.5 to 1 kilogram of crystal trichlorfon per acre can be applied with water to kill pests such as leek maggots. Control irrigation after the seedlings are 15 cm tall to prevent them from growing excessively and lodging. Weeds should be pulled out in time, and 0.5 to 0.75 kilograms of 25% herbicidal ether per mu should be used to control them when the seedlings are about 12 centimeters tall, or 0.15 kilograms of 33% herbicidal emulsifiable concentrate should be sprayed on the surface after sowing and before emergence.

Reasonable planting

For leek planting, choose a plot with fertile soil and convenient drainage and irrigation. Apply 4 to 5 cubic meters of decomposed farmyard manure per mu and level it to make a border. The borders are 2 to 3 meters wide, and are arranged in groups of every three. A 1-meter-wide cold protection zone is set up on the north side. Transplant from late June to early July. Before planting, cut off the ends of the fibrous roots and arrange the bulbs into small handfuls. Plant in holes on the flat border, with row spacing of 13 to 20 cm, hole spacing of 10 to 15 cm, and 6 to 8 plants per hole. It is advisable not to bury the leaf sheaths when planting. After planting, it should be firmly planted and watered in time.

Field management

After the new leaves of leeks emerge, water should be poured to slow down the seedlings, and cultivating should be carried out to maintain moisture and keep the soil dry and moist. After autumn, when the growth of leeks is at its peak, fertilizer and water must be fully supplied. In the future, the temperature will gradually decrease and the plants will grow slowly. Just keep the surface dry. Leeks require medium light intensity and are shade tolerant. However, if the light is too weak, there will be little accumulation of photosynthetic products, few and thin tillers, low yield, and prone to premature aging. The light is too strong, the temperature is too high, there are many fibers, and the quality is poor.

Harvest at the right time

The yield of leeks is low in the first 1 to 2 years after planting. The peak growth period is 3 to 6 years with the highest yield. After 10 years, it enters the senescence stage and should be harvested in time. Plant transplantation. The number of harvests per year is determined by the growth of leeks, fertilization conditions and market conditions. The standard for cutting leeks is 7 leaves and 1 heart. Harvesting is best in the early morning. It is appropriate to cut to the yellow leaf sheath 3 to 4 cm on the bulb. The cut should be slightly higher than the previous cut to ensure normal growth.

Reference material: Leek cultivation technology-Baidu Encyclopedia