Chrysanthemum likes fertile, strong water permeability and acid soil, and the soil with a large value of < span > pH < /span > 7.5 < /span > is very easy to cause the lower part of chrysanthemum to take off leaves or the whole plant leaves to turn yellow.
Solution: often pour fermented rice washing water or rainwater. However, do not use the domestic wastewater at will, which will affect the growth of plants.
Too much water causes soil water to stay wet for a long time, poor air permeability and even some fibrous roots to rot, showing that chrysanthemum tender leaves are dark yellow and lusterless, and new shoots shrink.
Solution: the principle of chrysanthemum watering is that if the pot soil is dry, it will be watered; if not, it will be watered thoroughly. In summer, the climate is hot, and the basin soil is easy to dry, so it should be watered fully, but not at noon, in the morning, and in the evening, the basin soil can be watered again < span > 1 < /span > times. Pour water into the side basin after the rain. Prevent soil from splashing on the blades when watering.
Because chrysanthemum has not been watered or dehydrated for a long time, although the color of the new leaves is normal, the lower leaves gradually dry up and fall off.
Solution: during the growth of chrysanthemum, sufficient watering is needed. The pot soil can be watered again after it is dry, but it should not be watered when the sun is strong at noon.
Too much fertilization can also cause yellow leaves.
Solution: to fertilize chrysanthemum, it is necessary to apply more thin fertilizer, and it can be a little thick after seeing flower bud. The top dressing can be made by adding < span > 8 < /span > water in < span > 2 < /span > parts of bean cake and sesame oil residue, and applying < span > 1 < /span > times every < span > 710 < /span > days. After budding, fertilizer can be added with water and a small amount of potassium dihydrogen phosphate. After application, wash off the fertilizer solution on the leaves with clear water in time.
The infection of leaf blight is one of the reasons for the yellow and withered leaves of chrysanthemum, which mainly damages the flowers and leaves of chrysanthemum.
Solution: spray < span > 1 < /span > every < span > 15 < /span > days < span > 500 < /span > times of wettable daphnium or daphnium zinc.
