Greenhouse Vegetable Seedling Sticks to "Three Highs and Three Lows"

The basic principle of temperature control is “three highs and three lows,” namely, “high during the day and low at night; high in sunny days and low in cloudy days; high in seedlings before transplanting, and low in seedlings before planting after transplanting”.

The main points of temperature regulation in different growth stages are: sowing to unearthed (germination period), higher temperature should be given, generally 20-30°C for cool vegetables, 10-15°C for night, and 25-35 for warm vegetables. °C, 18 ~ 20 °C at night; Unearthed to true leaf appearance, in order to prevent seedlings long, appropriate to reduce the temperature, generally 4 ~ 5 °C lower than the germination period; sub-seedling to moderate temperature, in order to promote hair roots, generally Hi-cool vegetables are 20~25°C during the day, 10~13°C during the night, 25~30°C during the daytime, 15~18°C during the night, and the temperature is reduced during the week before planting. The cold hardening seedlings are used to improve the adaptability of the seedlings.

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