First, pick root seedlings (a) select the permeability of the soil as a seedbed. (B) The use of geothermal line nursery, the seedbed temperature maintained at 20 °C ~ 25 °C during the day, kept at 15 °C at night. (c) Control watering. (4) In the event of rooting, it is necessary to promptly ventilate and drain moisture. It is also possible to apply fine dry soil and ash to dampness.
Second, leggy seedling (a) strictly control the amount of sowing. (b) When the seedlings grow congested, and when they are seedlings and seedlings. (c) Expand line spacing at seedlings to prevent excessive shading. (D) to increase light as much as possible, even on cloudy days should be properly exposed, so that seedlings see more light. (e) Control watering. (6) Foliar application of 0.2% glutinous liquid fertilizer plus 0.2% to 0.3% potassium dihydrogen phosphate solution to promote seedling growth.
Third, the aging seedlings (a) strictly control the seedling age, seedlings should be appropriate to the length of time. (2) During the seedling stage, the low-temperature time should not be too long to prevent the seedlings from aging due to prolonged drought. The seedlings should preferably be controlled by temperature without water control. (C) of the aging seedlings, per square meter seedbed can be sprayed with 10 ~ 30PPm gibberellin solution plus 0.2 ~ 0.3% potassium dihydrogen phosphate solution to stimulate seedling growth.
Fourth, frozen seedlings (a) to improve the means of raising seedlings, the use of artificial temperature control seedlings, such as electric hotbed nursery. (2) Strengthen nighttime insulation measures before the advent of the cold current, such as covering grasshoppers, covering paper quilts, covering small sheds, etc., and keep them as dry as possible to prevent rain and snow from getting wet. If necessary, take warming measures such as raw stove fire. Wait. (3) Appropriately control watering, reasonably increase phosphate fertilizer, and improve the cold resistance of seedlings. (4) Spraying the nutrient solution on the frozen seedlings. The formula for the nutrient solution is: 30 ml of liquid fertilizer plus 250 g of sugar, 1 g of gibberellin, 0.3 g of rooting powder, and 15 kg of water.
Fifth, drug seedlings (a) scientific and rational use of drugs. (b) Keep the seedbed moist before use. (C) After the occurrence of drug injury, spray water or relieve the drug in time. If 0.2% zinc sulfate solution is sprayed when Formamide arsenic occurs, 0.2% borax or boric acid solution will be sprayed when Dimethoate damage occurs. Spray a 0.05% solution of gibberellin.
Sixth, wilt seedlings (a) in the event of a sudden cloudy day after sunny, the seedlings should gradually see light, do not open all the cover, should be removed in batches, and gradually increase the light. (2) If the seedlings are wilted shortly after the exposing ceremony, cover them immediately and wait till the seedlings return to normal before releasing them. Do not water the wilt seedlings.
Seven, wearing a cap seedling (a) seedbed bottom water should be enough. (b) The thickness of the cover soil should be uniform and appropriate. For example, the thickness of the nursery bed for cultivating peppers and eggplants is 1 cm, and the thickness of the seedling bed for cultivating cucumbers is 1.5 cm. (3) Before sowing, the bed surface should be covered with plastic film to keep the soil moist. (D) When the seedlings appear, spray the water first, and then remove the caps with a brush after the moisture is absorbed.
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