Lettuce Sowing Time And Sowing Techniques

By Author: doris zhang
Total Articles: 78
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Lettuce, also known as lettuce, leaf lettuce, is a common herb crop in the southeast coastal areas in 2012, because it contains a variety of vitamins and minerals have been absorbed by the body and quite popular with consumers, at present, China's planting area is increasing year by year, that lettuce what season to sow? What are the planting techniques? Let's take a look!

Lettuce what season to sow
Lettuce like cool climate, so sowing time is generally spring and autumn, spring generally in February to April to start sowing, May to June can be harvested, and autumn sowing can then start sowing at the end of August, September to October can be harvested, because different varieties of lettuce characteristics are different, in the choice of sowing time, to first understand the instructions to buy lettuce seeds, and then combined with the above sowing time Sowing. In spring and summer,marijuana grow system loose leaf lettuce (such as cream lettuce and colored leaf lettuce) is suitable for sowing and is more heat resistant, while in autumn ...
... and winter, nodular lettuce (also called western lettuce) is suitable for sowing and is not heat resistant.

Lettuce planting methods
1. Selecting good seeds for sowing: To select suitable varieties according to needs, such as glass lettuce,, Caesar, nodular lettuce, flowering leaf lettuce, Great Lakes 659, etc.

2. Preparation of seedbed: lettuce seedlings should be used to retain water, fertility, fertile sandy loam soil. Bed soil preparation: 10 square meters of seedbed with 10 kilograms of well-rotted organic fertilizer, ammonium sulfate 0.3 kilograms, calcium superphosphate 0.5 kilograms, potassium sulfate 0.2 kilograms, mixed evenly spread and raked fine, pour enough water, water seepage after sowing.

3. Sowing seedlings: In order to make sowing uniform, sowing seeds can be mixed with a small amount of fine sandy soil, after sowing cover 0.3 ~ 0.5 cm thick tide soil, and cover the film moisture. The amount of seeds sown per mu is 30 to 50 grams. When the seedlings start to emerge, the mulch should be removed from the beds in time to prevent growth. The temperature of the seedbed should be controlled at 18℃～20℃ during the day and 12℃～14℃ at night. Pay attention to ventilation and shading in case of strong sunlight exposure. When the seedlings grow to 2 to 3 true leaves, according to the plant spacing of 6 to 8 cm seedlings, grow to 4 to 5 true leaves can be planted, seedlings generally do not lack of water without watering.

4. Scientific fertilization: lettuce requires organic matter-rich, water- and fertilizer-holding clay loam, lettuce like slightly acidic, soil pH 5 to 7 is appropriate. Each production of 1000 kg of lettuce, need to absorb 2.5 kg of nitrogen, phosphorus 1.2 kg, potassium 4.5 kg, of which the ball lettuce needs more potassium. Nitrogen, phosphorus and potassium fertilizers need to be used together during the growth period. Planting lettuce plots to deep plowing, planting before the application of sufficient fertilizer, mu rotted farmyard manure 3000 ~ 3500 kg, after application of deep turn, watering sufficient bottom water, see dry after making the border.

5. Careful planting: irrigate the seedbed one day before planting to make the seedling heap moist, and start the seedlings the next day with as much soil as possible to reduce root damage. When planting, first open a ditch in the border, ditch depth 4-6 cm, 70 cm border planting 3 rows, after the ditching of 25 kg per mu into the ternary compound fertilizer after irrigation, water seepage according to the plant spacing 24 cm seedling cultivation to seal the ditch, rake the border, cover the film, lead seedlings out of the film.

6. Post-planting management: lettuce like wet, the whole reproductive period requires adequate water supply. Planting 5 to 7 days after the watering of a slow water. After watering the seedling water did not cover the plot of the film for 2 times in the loosening and weeding. After that, water 3-4 times and apply nitrogen and phosphorus fertilizer in stages with watering, 15-20 kg per mu. Stop watering before harvesting to facilitate storage and transportation.

7. disease and insect control: lettuce of the main diseases are downy mildew, soft rot, viral diseases and botrytis, etc., of which botrytis and soft rot are more harmful, can take crop rotation, appropriate to reduce planting density,cannabis vertical farming watering do not too much, often shallow hoeing row, keep the soil surface dry, found diseased plants in time to pull out, dead leaves concentrated burned, after the onset of the disease can be sprayed with agricultural streptomycin and Dysonium, in the high temperature and high humidity season every 5 to 7 In the hot and humid season, spray chlorothalonil once every 5-7 days to prevent the purpose. Insect pests are mainly aphids, thrips, ground tigers, etc., with oxymethoprene, quicklime and other control.

8. Scientific harvest: not ball lettuce can be harvested at the right time according to the market price, ball lettuce to the leaf ball tight after harvesting is good, too early will affect the yield, too late the leaf ball within the stem elongation, the leaf ball becomes loose quality decline.