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What are the common physiological disorders of cut lilies

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1. Yellowing and leaf drop: yellowing and leaf drop caused by poor soil permeability, followed by root damage caused by salt accumulation and overwatering, as well as nutrient deficiency, overfertilization, water stress, and excessively low temperatures; therefore, improve the soil before planting, and never overwater. 2. Leaf scorch: apart from variety, the cause of leaf scorch is mainly excessive fluctuation in factors such as temperature, light, water, and humidity; calcium deficiency and excessively high fluorine content can also cause leaf scorch. Therefore, in daily management, especially in protected cultivation management,

1. Yellowing and leaf drop: yellowing and leaf drop caused by poor soil permeability, followed by root damage caused by salt accumulation and overwatering, as well as nutrient deficiency, overfertilization, water stress, and excessively low temperatures; therefore, improve the soil before planting, and never overwater.

2. Leaf scorch: apart from variety, the cause of leaf scorch is mainly excessive fluctuation in factors such as temperature, light, water, and humidity; calcium deficiency and excessively high fluorine content can also cause leaf scorch. Therefore, in daily management, especially in protected cultivation management, avoid excessive fluctuations in environmental factors such as day-night temperature difference, ambient temperature, and light intensity; foliar spraying of calcium nitrate or calcium chloride can prevent leaf scorch caused by calcium deficiency. For excessively high fluorine content, the fluorine content in chemical fertilizers, irrigation water, and substrate should be controlled, soil and water quality should be tested in advance, and perlite etc. should be rinsed with clean water.

3. Bud abortion and bud drop: buds that die when ≤0.25 cm are called "bud abortion," and those that die after reaching a bud length >0.25 cm are called "bud drop." Changes in environmental factors (low light, high humidity, low temperature, etc.) can cause bud abortion and bud drop; poor root development caused by poor soil permeability can cause bud abortion and bud drop, and excessively high EC value of irrigation water, long-term unreasonable application of chemical fertilizers, and "salt return" caused by flooding irrigation can all cause bud abortion and bud drop. Therefore, improving the soil before planting, controlling the EC value of water (rainwater is best), and rationally applying chemical fertilizers are the key measures to avoid bud abortion and bud drop.

4. Nutrient deficiency: the more common deficiencies are N, Fe, Mg, B, Ca, etc. When N is deficient, the color of the entire leaf becomes lighter, and later the plant becomes slender and soft; when Fe is deficient, the mesophyll tissue between the veins of young leaves turns yellow; when Mg is deficient, plant growth is slow, the leaves are light in color and bend downward; excessively high or excessively low soil acidity can cause deficiencies of trace elements such as Mn and B. Soil pH should be below 6.5, and at most should not exceed 7. Fertilization should be light and frequent. Topdressing can be done 4 weeks after planting, using 100 kg Ca(NO3)2/ha, 100 kg quick-acting nitrogen/ha, and other fertilizers, until 3 weeks before harvest. The total concentration of topdressing fertilizer should be below 1% and must not exceed 1.5%, with an interval of 7-10 days.

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