It's too hot, Lily.

Lily planting in summer, temperature control range:

The suitable growth temperature of lily is 15 ~ 25℃. If it is lower than 10℃, it will grow slowly, and if it is higher than 30℃, it will not grow well. During the growth process, the daytime temperature is 2 1 ~ 23℃ and the nighttime temperature is 15 ~ 17℃. Bulbs for cultivation must be stored at a low temperature of 7 ~ 10℃ for 4 ~ 6 weeks.

Lily needs water, which is beneficial to the growth of stems and leaves. If the soil is too wet, stagnant or poorly drained, lily bulbs will rot and die. The watering of potted lily should be gradually increased with the growth of the plant, and the water supply should be sufficient during flowering, and the watering should be reduced after flowering, and the watering should be stopped after the overground part withered. Pot soil is too wet, which also leads to bulb rot.

Lily likes soft light. It is also resistant to strong light and semi-shade, and insufficient light will cause flower buds to fall off and reduce the number of flowers. Sufficient light, stout plants, bright flowers. Lily is a long-day plant, which can blossom early by increasing the illumination time by 6 hours every day. If the light time is reduced, flowering will be delayed.

The soil requires fertile, loose and well-drained sandy loam, and the pH value of the soil is preferably 5.5 ~ 6.5. Potted soil is a mixture of humus soil, cultivated soil and coarse sand.

Lily is cold-tolerant, but the optimum growth temperature is between 15-25 degrees, and it will grow poorly below 10 degrees or above 30 degrees. Lily generally likes acidic soil with ph value of 5.5-6.5 and humus-rich soil with bulk density below 1g/cm3. Avoid flooding and prefer semi-shading environment, but excessive shading will cause the flower stems to grow white and the flower buds to fall off.

Most lily varieties like sunshine, and the southern region should be planted in a cool and semi-shady place. Lily is suitable for fertile, loose and well-drained soil, with low requirements for humus and neutral or slightly acidic PH value. Lily is a short-day plant, which needs a warm, humid and cold climate and is afraid of high temperature and heat.

Lily planting method:

Lily likes a cool and humid environment, and sunny places and slightly cloudy environments are more suitable for lily. Avoid dry heat, cold resistance is slightly poor. The growth and flowering temperature is 16-24℃. If the temperature is lower than 5℃ for 5-7 consecutive days at night in winter, the differentiation and development of flower buds will be seriously affected, and flowering will be delayed or even blind. Lily likes fertile soil rich in humus and hates hard clay. Slightly acidic soil with good drainage is better. The propagation methods of lily include bulb propagation, scale cutting, sowing propagation and tissue culture.

First, the growth habits of lily

Lily is a bulbous flower of Liliaceae, which likes sunshine environment and belongs to long-day plants. The length of light affects not only the differentiation of flower buds, but also the growth and development of flowers. Lily doesn't like high temperature, but she likes cool and humid climate. The optimum growth temperature of Asian lily and Oriental lily is 20-25℃ in the daytime, 25-28℃ in musk lily and above 65438 04℃ at night. When the temperature is higher than 30℃, the growth and development of lily will be seriously affected, bud elimination will occur and the flowering rate will be significantly reduced. When the temperature is lower than 10~C, the growth almost stops.

Second, lily's requirements for soil

Lily requires that the soil should be sandy loam rich in humus, with deep and loose soil layer, which can maintain appropriate humidity and good drainage. Lily shouldn't be planted in the soil. Lily likes slightly acidic soil, and the suitable soil ph value of Asian lily and musk lily is 6-7, and that of Oriental lily is 5.5-6.5. Lily is generally not salt-tolerant, so the content of fluorine and chlorine in the soil should be below 50mg/L, and the total salt content in the soil should not be greater than 1.5ms/cm.

Third, the preparation work before planting

1, soil disinfection: before planting lily, soil disinfection should be carried out. Commonly used disinfection methods include steam disinfection and chemical disinfection. Steam disinfection has high energy consumption and troublesome operation, so it is rarely used at present. Chemical disinfection is to use 40% formalin to prepare 65,438+0: 50 or 65,438+0: 65,438+000 times of liquid medicine to sprinkle soil, and the dosage is 2.5 kg/m2. After spraying, cover it with plastic film for 5-7 days, and uncover it to dry for 65,438+00-65,438+.

2. Thawing and disinfection of seed balls: unpack the seed balls immediately after arrival, thaw at 10- 15℃, and disinfect after complete thawing. Disinfection method: soak the seed balls in11000 water solution such as carbofuran, chlorothalonil, carbendazim and potassium permanganate for 30 minutes, or soak the seed balls in 80 times of 40% formalin solution for 30 minutes, take them out, rinse the residual solution on the seed balls with clear water, and then dry them in the shade before planting. In some domestic planting bases, the original basal roots are cut off before planting, which is conducive to promoting the development of new basal roots.

3. Preservation of seed balls: If the thawed seed balls can't be planted immediately, they can't be frozen again, otherwise there is a danger of frostbite. They can be stored at 0-2℃, but only for two weeks at most; It can also be stored at 2-5℃ for up to one week, and plastic film packaging must be opened at the same time.

Fourth, planting depth and density.

For planting in spring and summer, the planting depth requires that the top of bulb is 8- 10 cm from the ground, and 6-8 cm in winter. Planting density varies with variety, bulb size and seasonal factors. It can be planted densely in spring and summer, and sparsely in winter when the sun is weak.

Verb (abbreviation for verb) Post-planting management

1, Temperature: In order to obtain high-quality cut lily flowers, the temperature control in the greenhouse is very important. The soil temperature must be kept at a low temperature of 9- 13℃ within 3-4 weeks after planting to promote rooting. If the temperature is too low, the growth period will be unnecessarily prolonged, and if the temperature is higher than 15℃, the rooting will be stunted. These stem roots will soon replace the basal roots to provide plants with 90% water and nutrition, so the development of stem roots is very important for obtaining high-quality lilies. After the rooting period, the ambient temperature of Oriental Lily should be controlled at 15-25℃, and that of Asian Lily and Musk Lily should be controlled at 14- 23℃. If the temperature is too high during the day, ventilation and shading should be adopted to reduce the temperature; If the temperature reaches 15-25℃ at night, the cut lily will have shorter stems, fewer buds and lower quality. At this time (in China), there is a method to spray plants with gibberellin solution to increase the length of stems. The specific dosage varies with different growth periods and environmental temperatures, generally less in the early stage of growth and more in the later stage. The winter temperature in solar greenhouse in China will generally prolong the growth period of lily and seriously affect the quality of cut flowers, so we should increase the means of temperature regulation.

2. Humidity: Before planting, the soil moisture should be compacted and loose. In high temperature season, before planting,

If possible, cold water should be poured once to reduce the soil temperature. After planting, water again to make the soil fully contact with the seed balls, and create good conditions for the development of stem rooting. The standard of watering in the future is to keep the soil moist, that is, it is appropriate to hold a handful of soil in your hand without giving water. Watering is usually done in sunny mornings. The relative humidity should be 80%-85%, and the relative humidity should avoid too big fluctuation, otherwise the phenomenon of burning leaves may occur.

3. Fertilizer: In the early stage of bulb growth of flowering lily, the nutrients stored in its scales are mainly consumed, and there is no need to add too much base fertilizer before planting. After planting for one month, it can be topdressed according to the fertility of the land. Lily has a great demand for potassium, so compound fertilizer can be prepared according to the ratio of n-P2O5-K2O =14: 7: 21. Top dressing per mu 10 kg, once every 10- 15 days until 3 weeks before flower picking. At the same time, we should also pay attention to the supplement of trace elements, such as iron, boron and zinc.

4. Illumination: Illumination is an important condition for quality control, especially for the development of lily flower buds. Insufficient light will cause poor plant growth, lily bud drop, light leaf color and color, and shorten vase life. When lily is planted in winter in northern China, about 25-30% of the sunlight is blocked due to the influence of thermal insulation materials such as glass or plastic film. Therefore, in addition to keeping the surface of glass and plastic film clean and making it transparent, some varieties also need to fill the light, and incandescent lamps can be used to fill the light. High-pressure sodium lamps for gardening should be used in good modern greenhouses. Lily production in summer should also avoid direct sunlight, and generally use sunshade nets to shade the sun. Asian and musk lilies shade 40%, and oriental lilies shade 50%.

5. Carbon dioxide: Carbon dioxide is beneficial to the growth and flowering of lily. 8- 10 on a sunny day, are you there?

In a ventilated shed, carbon dioxide gas pills are applied to increase the content of carbon dioxide in the shed. Other methods can also be used. For example, hang a plastic bucket every 15-20m (the height from the bucket to the ground is 1m), and the bucket is filled with 20% sodium bicarbonate solution (baking soda commonly used at home is sodium bicarbonate), and then gradually pour the prepared 10% dilute sulfuric acid solution into each plastic bucket for 3-4 times. A 60-meter-long and 7-meter-wide solar greenhouse needs 1.7 kg of pure sodium bicarbonate and 1 kg of concentrated sulfuric acid (concentration is 98%).