Lettuce planting time is all year round. Planting methods: watering management, fertilization, mid-tillage weeding, pest control.

Lettuce planting time

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

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 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.

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 intervals between the date of long; late spring and early summer temperatures rise, drought winds, watering should be diligent, the amount of water should be large; summer rainy watering or no watering, no rain dry heat and should be watered to reduce the temperature of the soil.

Water demand during the growth period, watering should 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, both to ensure that the plant's need for water, but 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 fertilized. The first stage of the ball lettuce in the ball, should be chased with the water 1 feces and urine fertilizer to promote the growth of leaves; 15 ~ 20 days after the second feces and urine fertilizer, about 1500kg per acre.

Ball lettuce heart leaves began to curl inward, need to be chased again 1 feces and urine fertilizer, about 2000kg per acre, and in the two rows of shallow ditch in between the application of 15kg of grass ash, mulch, to avoid the contact with the fertilizer root system.

3, plowing and weeding

After planting and slowing down, in order to promote the development of the root system, it is appropriate to carry out plowing and weeding, so that the soil surface is loose and breathable. Before sealing the spring lettuce sunny 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 once can. The root system of nodding lettuce is shallow, and plowing should not be too deep to avoid damage to the root system.

4, pest control

Lettuce pests and diseases are not much, in the production of few pesticides, but there are downy mildew, botrytis, viral diseases, brown spot and other diseases, aphids, red spider, tigress, greenfly and other insect pests occur.