ハクサイ
Napa cabbage has very small seeds with a thousand kernel weight of about 2.5–2.8 g. For professional cultivation it is recommended to use disinfected seeds to prevent onset diseases. With the single-grain sowing technique, about 400–500 g of seeds per hectare is required; with the normal sowing technique, about 1 kg per hectare. If the normal sowing technique is used, the seedlings must be thinned out after 2–4 weeks. The seeds should be deposited 1–2 cm deep, with a row width of 40–45 cm and 25–30 cm distance between the seeds.