Iceberg lettuce matures in 60-80 days, depending on the variety.
Lettuce is grown in heated rooms and greenhouses.
Plant 3-5 seeds at a distance of 1-2 cm. If you have boxes, not pots, then plant the next batch at a distance of about 40 cm.
Do not deepen the seeds too much - just make holes about 1 cm deep.
After planting, water the seeds warm filtered water and cover the containers with cling film.
Both seeded and planted lettuce are often watered by sprinkling (every 2-3 days) until seedlings emerge or take root (usually 6-10 days).
After seedlings emerge, before thinning (2 to 3 weeks after sowing), watering is not done as often.
The most common nitrogen fertilizers are ammonium nitrate and urea.
Complex mineral fertilizers are also used: nitrophoska, ammophos, diammophos.
Lettuce is sown when the soil reaches physical ripeness.
It is best to sow calibrated seeds, this makes it possible to obtain a high yield.