1 while the slow or not emergence
Seedling, should first ensure after seeding emergence and uniformity.Locations tend to appear in production for a long time, the emergence or not neat emergence of the problem, the main reason is that the seed quality is not high, and sprouting not neat, turns the soil too thick or less thickness, Mark Twain, soil humidity, etc.Is best done when the seed soaking seeds, therefore, washed, will not be substantial seeds removed, warm water soaked with 7 to 8 hours.After the seed sprouting in 25 ~ 30 ℃ temperature conditions.Irrigation water shoulds not be too large when sowing, bottom water is too big, too wet bed soil, Mark Twain is low, low germination rate.Covering 0.5 ~ 1.0 cm after sowing.During the emergence of Mark Twain should not be less than 17 ~ 18 ℃, with about 25 ℃ advisable.
2 the seedlings moderate growth
Moderate growth seedling "tall seedlings", because the planting too close, humidity, illumination is insufficient, bed temperature is too high, moderate growth, the seedling stem slender, thin section, thin leaf, color pale, soft, fibrous root.Fine seedbed ventilation is not timely, bed temperature, humidity, higher planting density and singling, excess nitrogen density is too high, is the main factor of moderate growth seedling formation.In addition too rainy day, illumination is one of the reasons.Prevent method is sowing to dilute;Control the humidity;Early thinning, dilute seedlings;Peel off before engraftment coverings, strengthen the light during the day, lower bed temperature.Moderate growth phenomenon, if there is any available 200 mg/kg cycocel foliar spraying, spraying on the seedling stage two, moderate growth, increase the stem diameter, can be controlled and promote root development.Cycocel spray should be in early and late, after processing can be appropriately ventilation, prohibited within 1 ~ 2 days after injection of the water bed.
Improper 3 miao miao death
Miao miao a while too much, make seedling excessive water loss is difficult to restore and dead plants, seedlings on bad points before seedling growth, root system, and miao too late, cause root damage, weak absorption capacity will dead plants.So, don't too much on seedling root damage, bring extra bed soil, a seedling don't too much;Points MiaoYi small not big, to improve the survival rate.As "miao should choose a sunny day.
4 seedling disease
Seedling disease mainly damping off, damping off and mould.This kind of disease prevention first, through the seed disinfection, soil disinfection bed;2 it is through the do a good job of the seedbed insulation and ventilation.Detection, immediately remove center strain, and prevention and control of spraying.The three kinds of diseases are fungus diseases, chlorothalonil, mildothane, prevention and cure of carbendazim and so on.In case of cold wet weather it is best to use powder broadcasting or mix some prevention and control of plant ash or dry fine soil.In addition, some for removed the cover before engraftment, rain hitting the seedling directly and produce scab.Scab for bacterial diseases, rain washed easily to the pandemic of the disease, so in the seedling stage to special waterproof job, do not let rainwater leaching on the seedling directly.
