Autumn and winter greenhouse vegetable seedlings insist on "three highs and three lows"
2022-10-13 15:04:10
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 transplantingâ€.
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.
There are seven tricks for greenhouse freezing vegetables
Soil surrounding the soil before the roots are frozen and combined with the cultivator, and the fine soil surrounding the roots can loosen the soil, increase the soil temperature, and can directly protect the roots. However, the cultivating soil must be carried out before the soil is frozen. The depth should be 5 to 10 cm.
Adding farm manure with warm manure such as pig manure or earth miscellaneous manure, cultivating in the roots of vegetables, can increase the root soil temperature 2 °C ~ 3 °C, the application should be carried out in the sunny.
Foliar Fertilizer Spraying the vegetable in the greenhouse with a new high-fat membrane + 0.2% potassium dihydrogen phosphate solution can not only supplement the plant nutrition, but also prevent the invasion of the plant and increase the cold resistance.
Rainproof insulation Insulation during the daytime rain, promptly peeling off the cover, preventing the beddings of grasshoppers, grasshoppers, etc. from being affected by the rain. However, care must be taken not to allow the rain to splash into the concrete; during the nightfall, the rain should be taken after the rain. Sun dried.
Cover stalks In the afternoon before the frost comes, cover the vegetables and vegetables with wheat straw, etc., to reduce the cold damage, to spread sparsely, must not cover all the vegetables, so as not to affect their photosynthesis.
Before the advent of low-temperature freezing of straw ash, a thin layer of ash is applied on the vegetables and between the rows, which is conducive to heat preservation.
Irrigation and irrigation irrigation can increase soil heat capacity and prevent soil temperature from falling, but keep in mind that irrigation should not be performed during the freezing period.
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.
There are seven tricks for greenhouse freezing vegetables
Soil surrounding the soil before the roots are frozen and combined with the cultivator, and the fine soil surrounding the roots can loosen the soil, increase the soil temperature, and can directly protect the roots. However, the cultivating soil must be carried out before the soil is frozen. The depth should be 5 to 10 cm.
Adding farm manure with warm manure such as pig manure or earth miscellaneous manure, cultivating in the roots of vegetables, can increase the root soil temperature 2 °C ~ 3 °C, the application should be carried out in the sunny.
Foliar Fertilizer Spraying the vegetable in the greenhouse with a new high-fat membrane + 0.2% potassium dihydrogen phosphate solution can not only supplement the plant nutrition, but also prevent the invasion of the plant and increase the cold resistance.
Rainproof insulation Insulation during the daytime rain, promptly peeling off the cover, preventing the beddings of grasshoppers, grasshoppers, etc. from being affected by the rain. However, care must be taken not to allow the rain to splash into the concrete; during the nightfall, the rain should be taken after the rain. Sun dried.
Cover stalks In the afternoon before the frost comes, cover the vegetables and vegetables with wheat straw, etc., to reduce the cold damage, to spread sparsely, must not cover all the vegetables, so as not to affect their photosynthesis.
Before the advent of low-temperature freezing of straw ash, a thin layer of ash is applied on the vegetables and between the rows, which is conducive to heat preservation.
Irrigation and irrigation irrigation can increase soil heat capacity and prevent soil temperature from falling, but keep in mind that irrigation should not be performed during the freezing period.
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