Early spring cucumber cultivation in the greenhouse is not properly managed, prone to sick seedlings, weak seedlings, injury seedlings and other special-shaped seedlings, resulting in losses. Light flash seedlings that is wind flash seedlings or warm flash seedlings. In the case of a sudden rainy weather, bright light, high temperature, and (cold) hot air caused the water supply and demand of the guava seedlings to be disordered. The upper half of the seedlings softened and wilted, and the whole plant died in severe cases. Response measures: In case of more than 2 days with cloudy days, the weather will be lightly and weakly lightened after sunny days. It was found that the seedlings were wilting and immediately sprayed 300 times of rice vinegar, or low-concentration solutions such as washing powder, photosynthetic fertilizer, high yield treasure, and vegetable spirit, etc., to supplement the moisture and stimulate the vitality of the melon seedlings. Remove unrecoverable plants in time, and make up. Four days after the emergence of rigid seedling seedlings, the cotyledons were dark green, leaf margins were lower, stems were short, and growth was slow. Most of them were caused by less fertilizer, less water, excessive soil viscosity, or unfermented manure. Responsive measures: Bed soil is the best for manure soil. Watering before sowing to meet the water requirement during seedling period. Viscous heavy soil should be mixed with fine sand and deeply sun exposure. Water spray or foliar growth promotes long. Dwarf seedlings are dwarf, with small leaves, light shade and no light, internodes too dense, stems hardened and fine, roots are stunted, brownish. Seedbeds have poor soil quality and lack of water, especially when there is water shortage, low temperature, and lack of fertilizers. Responsive measures: (1) Choose fertile soil, permeable water, good physical soil or sandy soil as seedbed. The nutrient soil should be mixed with fully cooked high-quality organic fertilizer in a ratio of 6:4, and appropriate amount of plant ash should be added. Sufficient moisture is supplied. The seeds are soaked in water and then sown. The relative humidity of the soil is maintained at 70% to 80%. (2) The temperature needed to keep the seedlings germinating is generally controlled at 22 to 25°C during the daytime and 12 to 18°C ​​at night. The leggy seedlings are slender, with long internodes, large and thin leaves, light leaf color, soft breakage of petioles and stems, poor root development, and small and small root systems. The seedlings are susceptible to frost damage and bacterial infection, less flower differentiation, easy formation of melons and falling flowers, and low survival rate of colonization. The temperature is too high, the ventilation is not timely, lack of light, rainy days or grass cover early cover, night temperature is high, base fertilizer or nutrient soil nitrogen too much, too much water, the density is too easy to cause leggy seedlings. Countermeasures: (1) When the temperature is higher than 30°C, the air outlet can be closed when the temperature is lower than 20°C. The night temperature should not be too high. Generally, the temperature is 14 to 16°C in the middle of the night and 10 to 14°C in the latter part of the night. (2) Increase lighting, grass cover early cover, cover the room to increase the light curtain. (3) Take nutrition or nutritional paper bag nursery. Prepare nutrient soil, mix 6 parts of Datian soil and 4 pieces of fully-comminuted organic fertilizer, and add appropriate amount of plant ash. Appropriately sparse, expand the row spacing, suitable time seedlings and seedlings. (4) Properly spray 25 to 50 mg/l paclobutrazol solution to control growth.
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