Flowers often appear yellow during the cultivation process, which is a sign of poor growth. If we take effective measures in a timely manner, we can save the lives of flowers. If we cannot find the cause of yellowing, we can only hope to sigh. What are the reasons for flower yellowing? (a) The pests first look at pests. If the leaves are rough and dry, there are red spiders; if the leaves have yellow spots, it is a scale insect. Control can be used 70% Trichlorfon 1000 times or 40% Dimethoate water 2000 times spray. If it is caused by a virus, the leaves will be yellow and will quickly spread into pieces, should be removed in time to burn, and then sprayed with carbendazim or Bordeaux mixture to prevent and control. Do not overdosage, otherwise there will be phytotoxicity. (2) Evergreen, Fuchsia, Zhulan, etc., with strong light or less cool environment, do not like high-temperature exposure. If the sun is not properly shaded, yellow leaves will fall off. And if the flowers of Xiyang are not exposed to sunlight in the room for a long time, the leaves will turn yellow to form "Blow Yellow". Such as jasmine, white orchids due to lack of light yellow leaves. (3) Improper watering If watering too much or too much rain, it will lead to too wet basin, soil lack of oxygen, root rot, forming the top of the flower leaves yellow, the old leaves are gradually yellow, new shoots shrink . Stop watering or shelter from the rain and allow the soil to dry to improve soil ventilation, increase oxygen levels, reduce the toxic effects of excessive soil carbon dioxide on flowers, and allow flowers to grow normally and often loosen soil. If the watering is too little or the water is not poured for a long time, the color of the leaves on the top of the flower is normal, but the lower leaves gradually dry up and fall off yellow, forming a "dry yellow", which causes the trunk of the lower leaves to age. Water should be applied in an appropriate amount to keep the soil moist. (4) Inappropriate fertilization If the leaves of the flowers are thin and tender and yellow, it is generally due to large flowers and small pots or long-term no basin soil and insufficient fertilizer. Gradually increase the amount of fertilizer, but be careful not to overdo it. Potted flowers were changed for 1 to 2 years, and a small amount of basal fertilizer was added at the bottom, and part of the new soil was changed. If the leaves appear uneven, the new leaves are thick and the old leaves turn yellow, mostly due to fat. Water should be diligently and fertilizer should be suspended. If the amount of chemical fertilizer is too much or the application is uncomfortable, it will cause wilting and yellowing (fat injury). Some fertilizers, such as ammonium bicarbonate, are used when the temperature is relatively high, and it is easy to produce a large number of ammonia-burned flower leaves. The lighter leaves of the lower part of the flower are yellow, and the heavy ones are all red and yellow. Therefore, when topdressing chemical fertilizers, the amount of 1 time should not be too much, and the amount of urea per mu should not exceed 10 kg. The size of potted plants is 1.5-1.0g per pot. (five) the lack of acidic southern flowers usually like acidic, such as camellia, azaleas, orchids, white orchids, gardenia and so on. If the leaves gradually turn yellow, it is due to the alkaline nature of the soil, which can be watered with grass or ferrous sulfate, and the leaves will turn green soon.
Finished Drug,Anti-Hiv Drug ,Oem Acceptable
Glutathione For Skin Whitening & Beauty Co., Ltd. , http://www.nsrawpowder.com