How to grow lettuce, how to grow lettuce.

Lettuce doesn't like high temperature environment, but it is not cold-tolerant. The optimum growth temperature is 15 to 20 degrees, and the optimum soil pH is 5.8 to 6.6.

2. Sowing time

Lettuce can be sown for a long time, from August of that year to February of the following year, and the most suitable sowing time is1mid-October to1mid-February. Of course, you can sow from early March to early July, but the yield is not necessarily high.

3. Seed germination

When planting lettuce in high temperature season, the seeds must germinate at low temperature. Soak in well water for about six hours, then pick it up and wrap it in wet gauze, and put it at 15 to 18 degrees Celsius for germination, or hang it in the well for germination.

4. Seedling raising and transplanting

Before sowing lettuce, fully water the seedbed, and then evenly mix the seeds with the same amount of wet fine sand before sowing. In winter and spring, when planting in greenhouse or open field, attention should be paid to keeping the temperature of seedbed.

5, scientific fertilization

Lettuce is planted on clay loam rich in organic matter and strong in fertilizer and water retention. Basically, per kilogram of lettuce, 2.5 kilograms of nitrogen fertilizer, 2.4 kilograms of phosphorus fertilizer and 9 kilograms of potassium fertilizer need to be absorbed.

6, careful planting

Be careful when planting. First, water the seedbed the day before, and bring more soil when planting seedlings the next day. When planting, first dig a ditch 4 to 6 cm deep at the edge.

Lettuce variety selection

1, lettuce

The main characteristics of lettuce are: the terminal leaves form bulbs, the leaves are complete, serrated or deeply split, the leaves are smooth or shriveled, and the terminal leaves form bulbs, which are round or nearly round. The main varieties are Hu Da 659, Qianwei 75, Sa Lin Nasi, Beishan No.3, Mamik and Green.

2, wrinkled lettuce

The main characteristics of wrinkled lettuce are no pilling, basal leaves, long oval leaves, long petiole, wavy or deeply lobed leaf margin and shriveled leaves. The main varieties are "Hongfan" purple leaf lettuce, safflower leaf lettuce, green wave lettuce and Dongshan leaf lettuce.

Step 3 stand upright

The main characteristics of erect lettuce are long and narrow leaves, vertical growth, full or serrated leaves, thick leaves, rough meat, poor flavor, few varieties, not widely distributed, and rarely planted in China.

Extended data:

The value of lettuce

1, medicinal value

Lettuce is sweet and cool. Because its stems and leaves contain lettuce, it tastes slightly bitter. It has the effects of clearing away heat, refreshing, relieving pain, hypnotizing, lowering cholesterol, and adjuvant treatment of neurasthenia. Lettuce contains mannitol and other effective ingredients, which has the effects of diuresis and blood circulation, liver-clearing and gallbladder-benefiting. ?

2. Health care value

Lettuce contains interferon inducer, which can stimulate normal cells to produce interferon, resist virus and improve human immunity. Lettuce contains a substance called protocatechuic acid, which has obvious inhibitory effect on cancer cells, especially in resisting digestive system cancers such as gastric cancer, liver cancer and colorectal cancer.

Vitamin E and carotene in lettuce can protect eyes, maintain normal vision and relieve eye dryness and fatigue. Lettuce is rich in vitamin C and has a little whitening effect. Lettuce has a high content of dietary fiber and other nutrients, which can eliminate excess fat if eaten regularly, so lettuce has the reputation of slimming lettuce.

3. Edible value

Lettuce is rich in nutrients, including a large number of β-carotene, antioxidants, vitamin B 1, B6, vitamin E, vitamin C, a large number of dietary fiber, magnesium, phosphorus, calcium and other trace elements and a small amount of iron, copper and zinc. Strengthen the digestion and absorption of protein and fat, improve the blood circulation of the stomach, and eat lettuce often.

References:

Baidu encyclopedia-lettuce