Among the many growers of oriental lilies, the problem of “leaf burning†has always been a problem that has plagued them. In particular, growers of varieties such as 'Star Gazer' and 'Acapulco' have been particularly troubled with “leaf burningâ€.
First, "leaf burning" performance:
Lily "leaf burning" occurs when no flower buds are visible to the naked eye. First, the young leaves curl slightly inwards, and after a few days yellow-green to white spots appear on the leaves. If the "leaf burn" is lighter, the plants can also grow normally. If the "leaf burning" is serious, the white spots can turn brown, where the damage occurs and the leaves bend. In severe cases, all the leaves and buds will fall off and the plants will stop growing. This is called "top firing".
Second, "leaf burning" reasons:
1. Physiological reasons: "Leaf burning" occurs when the balance between water absorption and evaporation is destroyed. This is the result of lack of water or transpiration caused by the lack of calcium in young leaf cells, cells are damaged and die. The rapid changes in relative humidity in the general greenhouse and the poor root development can occur. Higher soil salt content and faster plant growth relative to the root system can also have an impact.
2, the impact of light: generally believe that the dramatic changes in the weather, such as long after the rainy days suddenly turn clear, will directly lead to "leaf burning". In fact, before the rapid changes in the weather, the plants have already caused some physical damage due to lack of calcium, and the weather changes only accelerate the occurrence of this phenomenon.
3. Influence of relative humidity: High relative humidity in the growth process reduces the transpiration of the plant and reduces the transfer of calcium, resulting in calcium deficiency in the plant.
4. Variety differences: Some varieties such as 'Star Gazer', 'Acapulco', 'Tahiti', etc. are sensitive species and are prone to “leaf burningâ€.
5, the ball size: large size bulb (16/18 or more) compared to the small size of the bulb is prone to "leaf burning."
Third, prevention and control methods:
1, to ensure that plants can maintain stable transpiration: In sunny, dry weather, take shade, water spray and other ways to achieve the effect of cooling, humidification. In the case of rainy days, the use of circulating fan ventilation increases air circulation and increases plant transpiration. In the time when the oriental lily has increased sensitivity to the external environment, to avoid significant changes in temperature and relative humidity in the greenhouse, the relative humidity should be maintained at about 75%.
2. Box-type cultivation: To prevent the plant from growing too fast, during the first 6 weeks of growth, the temperature is maintained at 13°C-15°C. It is recommended that the box-type cultivation be used and the rooting room be used.
3, increase the light: Lily cultivated in winter or early spring, lack of light will increase the "leaf burning" possibility, conditions can use artificial light to help increase plant transpiration, reduce the "leaf burn".
4. Keep dry: Avoid standing water on the plant for a long time. Try not to use the top spray to keep the plants and the greenhouse dry.
5, increase the calcium fertilizer: such as calcium nitrate, can be carried out by the method of root fertilization or foliar fertilizer, but to choose the right growth stage, to ensure that every new leaf absorb enough calcium before the occurrence of calcium deficiency. However, it should be noted that if the method is incorrect, it may lead to negative effects.
6, choose the right variety: use the "leaf burning" insensitive varieties, if you can not avoid, should try to use small size bulb.
7. Appropriate planting methods: Planting bulbs with good root system. The planting depth should be appropriate. There should be 8-10cm soil layer above the bulbs.
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