Key Field Management Techniques for Lilies After Planting

After planting, for greenhouses, the main tasks are controlling light, temperature and humidity conditions, regulating soil moisture, and preventing and controlling pests and diseases.

① Temperature management: within 3-4 weeks after planting, soil temperature should be kept at 12-13°C; above 15°C is unfavorable for root development. From emergence to flowering, the indoor temperature should be raised, to 20-25°C during the day and around 15°C at night.

② Water management: keep the soil moist, not too dry, not too wet, not alternating between dry and wet; water frequently but lightly.

③ Fertilizer management: multi-element compound fertilizer is preferable. Research results by the Dutch in 1997 showed that nitrogen, phosphorus, potassium, calcium and magnesium can be mixed and applied in a ratio of 10:1.7:13.8:6.4:0.34. Apply light fertilizer frequently. After sprouting, apply once every 3-5 days, 10-25 times over the whole growing period.

④ Light management: the light period should be more than 16 hours a day; in winter, supplementary lighting for 4-6 hours is needed. In summer, shading is needed to reduce light intensity and air temperature, especially during the rooting period, when shading and cooling are even more necessary.

⑤ CO2 supplementation and ventilation: several issues need to be coordinated, namely the contradiction between ventilation and cooling and the contradiction between ventilation and heat preservation. Since the suitable CO2 concentration is 600 ppm, attention should be paid to CO2 fertilization.

⑥ Preventing lodging: cut flowers require not only large, brightly colored flowers and an elegant fragrance, but also firm, straight stems of a certain length. Lilies have large flower diameters and many flowers, and the plants are tall, so facilities to prevent lodging are essential. Usually, netting and supports are used to prevent lodging. When lilies grow to 20 cm tall, nets can be set up. After the nets are set up, manually assist the lilies so they enter the nets evenly. As the plants grow taller, the nets are raised accordingly. This can effectively prevent lodging.

⑦ Preventing bud drop and flower bud drying: when the first flower reaches 3 cm in length, spraying 0.5-1.0 mmol/L STS (silver thiosulfate) once a week can completely prevent it. STS must be applied when the first flower bud is 2-3 cm long. This is because this period is a specific stage in lily flower bud development - the end of meiosis in pollen mother cells - when the ethylene produced by the buds reaches its highest value (highest concentration). Lily flower buds are also extremely sensitive to ethylene, and ethylene can cause the buds to mature and drop. Silver ions have a strong special effect at the ethylene receptor site, blocking the action of ethylene, so when the first flower grows to nearly 3 cm long, STS gives the best effect. After treated fresh flowers are harvested (cut), even if the flowers are placed at 20°C in air with an ethylene concentration of 0.5 ppm for 24 hours, the buds still open normally, indicating that the effect of silver ions can last for a considerable time.