It's good to eat raw food, but can you guarantee the hygiene of your raw food? Can you ensure that all the eggs are washed clean? Have all the pesticides been washed away?
Lettuce Bulbous Lettuce is a 1 or biennial herb of lettuce or lettuce variety. It can grow to 0.25 to 0.8 meters high, with hollow stems and milk. Most leaves are oblate, ranging from typical oblong to needle-shaped to linear. The flowering period is from July to August, and the seed maturity is from August to September.
Ball lettuce, also known as western lettuce and round lettuce, is an annual or biennial herb of lettuce in Compositae.
Lettuce belongs to Compositae. Lettuce for leaves feeds on fresh tender leaves, and the export is mainly pelleting. Lettuce is a direct root system with shallow distribution and weak fertilizer absorption ability. The spherical lettuce is round, oblate, conical and cylindrical, with soft texture and is the main edible part.
Native to the coastal areas of China, I like the cold and humid climate. Lettuce contains dietary fiber and vitamin C, which can promote digestion. The interferon inducer and protocatechuic acid contained in it can improve human immunity, and the lettuce in its stem and leaf also has analgesic and hypnotic effects.
environmental requirement
1. temperature: lettuce head is a crop that likes cold and avoids high temperature. Seeds can germinate above 4℃, and the optimum temperature for germination is 15~20℃. The seedlings are tolerant to low temperature, and grow healthily at the daily average temperature of 65438 02℃. The optimum temperature for bulb growth is 65438 03 ~ 65438 06℃. However, at present, some varieties of lettuce can withstand high temperature, but it is best to harvest them in time before the rainy season.
2. Lettuce with bald head is a long-day crop, which needs sufficient sunshine during its growth. Insufficient light can easily lead to irregular or loose knots.
3. Soil Although leaf lettuce has wide adaptability to soil, it is bulbous lettuce. However, in order to obtain good leaf bulbs, bulbous lettuce must choose fertile loam or sandy loam. If the soil sand is poor and the application of organic fertilizer is insufficient, it is easy to cause various physiological diseases.
4. The root system of water-bearing lettuce is shallow in the soil, so it is required to have enough water supply before heading and keep the soil moist frequently. Low air humidity is required after granulation. If the soil moisture is too high or the air humidity is too high, soft rot is easy to occur.