Planting lettuce is usually carried out in the spring and fall, if planted in the hot season, you need to do a good job of germination in advance, soak the seeds in a nutrient solution for 6-7 hours, take out the seeds and keep them at a low temperature, and they will germinate in 2-3 days.

Seeds are usually sown into soil that is loose and has a good ability to retain water and fertilizer, covered with film after sowing, and shaded in spring and summer.

A, lettuce planting time:

Whether it is stem lettuce or leaf lettuce (lettuce) can be planted all year round.

1, spring cultivation: general stem lettuce spring open field in mid-February ~ late March sowing, mid-April planting, June harvest; lettuce in mid-March ~ late April sowing, mid-May ~ late June planting, in early June ~ mid-July harvest.

2, summer cultivation: stem lettuce in early April ~ mid-May open field direct broadcast, June ~ July harvest; lettuce in mid-May ~ late June sowing, late June ~ late July planting, late July ~ late August harvest. Generally open ground with mulching.

3, fall cultivation: stem lettuce in early July ~ late August sowing, late August ~ late September planting, using the open ground. Harvest in late September ~ early December. Lettuce open ground is sown in late August, planted in late September, and harvested in late October ~ mid-November. It can also be used in the open ground plus cover in late August sowing, planting in late September, harvesting in early November ~ early December.

4, winter cultivation: stem lettuce open field cultivation, in late September ~ early October sowing, planting in early November, mid-April ~ late May harvest.

To say the best planting season should be the spring and fall cultivation is the best, that is, between March and April and September and October this time.

Two, lettuce planting methods:

1, watering management.

Watering through the planting water after plowing and moisturizing seedling retardation, to ensure that the plant is not subject to drought. After slowing down the water, depending on the soil moisture and growth to master the number of watering, generally 5 to 7 days watering 1 time, sandy loam soil 3 to 5 days watering 1 time. Spring temperatures are low, soil moisture evaporation is slow, the amount of water should be small.

Watering interval date long; late spring and early summer temperatures rise, drought winds, watering should be diligent, the amount of water should be large; summer rainy less watering or not watering, no rain dry heat and should be watered to reduce soil temperature. Growing period of water demand, watering to be sufficient, so that the soil is often kept moist. Leaf lettuce like knotting lettuce leaf ball after knotting, to control watering, to prevent uneven moisture caused by cracking ball and rotten heart.

Protected cultivation, in the beginning of the ball, the field has been sealed, watering should pay attention to, not only to ensure that the plant on the need for water, but also not too much, so as not to avoid excessive humidity.

2, fertilization.

Stem lettuce fertilizer per 667_ watering concentration of 30% ~ 40% of the rotted human and animal manure 3000 ~ 4000kg 1 ~ 2 times. Overwintering lettuce is generally not suitable for fertilizer. The loose leaf lettuce is mainly bottom fertilizer, bottom fertilizer is sufficient when the growth period can not be fertilizer. In the early stage of balling lettuce, should be chased with the water 1 time feces and urine fertilizer to promote the growth of leaves; 15 ~ 20 days after the second feces and urine fertilizer.

Approximately 1500kg per mu; ball lettuce heart leaves began to curl inward, need to be applied again a manure and urine fertilizer, about 2000kg per mu, and between the two rows of shallow ditch applied 15kg grass ash, mulch, to avoid contact with the root system fertilizer.

3, plow weeding.

After planting seedlings, in order to promote the development of the root system, it is appropriate to carry out mid-plowing, weeding, so that the soil surface is loose and breathable. Before sealing the spring lettuce sunny and warm weather plowing 1 ~ 2 times; fall lettuce should be less plowing, shallow plowing; overwintering lettuce in the next spring in time to remove weeds, shallow plowing can be. The root system of nodding lettuce is shallow, and the plowing should not be too deep to avoid damage to the root system.