Flower leaves sometimes turn yellow during its growth. Especially for novices, it makes them confused. What is the reason why the leaves turn yellow? Next, please come with Xiaobian to see why the leaves of potted flowers turn yellow.
Leaves yellow potted flowers lack what leaves will be yellow 1. Lack of water for flowers or long-term water for half of the waist (i.e. wet up and dry down), which will affect the absorption of nutrients, and also easily lead to dull and lusterless leaves, wilting and drooping leaves. First, the old leaves in the lower part were aged and gradually withered from the bottom to the top. At this time, a small amount of water shall be poured and water shall be sprayed to make it gradually recover and then turn to normal watering. 2、 Lack of fertilizer for a long time did not apply ammonia fertilizer or change basin for soil, the lack of nitrogen and other nutrients in the soil, resulting in weak branches and leaves, thin and yellow leaves. It is necessary to pour the pot in time, and gradually increase the application of thin and mature liquid fertilizer or compound flower fertilizer in the new loose and fertile cultivation soil.
What is the lack of yellow leaves? 3. The temperature is too low in winter and the room temperature is too low. Flowers that like high temperature are often vulnerable to cold damage. Therefore, they cause yellow leaves and die when they are serious. If the room temperature is too high, the transpiration of the plant is too high, and the water and nutrition supply of the root is in short supply, the leaves will also turn yellow. Please pay attention to adjust the room temperature in time. 4、 Lack of light or ventilation if the sunshine loving flowers are placed in the shade or in the center of the lack of light for a long time, they will cause the branches and leaves to grow in vain, the leaves to be thin and yellow, and they will not bloom or rarely bloom. It is necessary to move the flowerpot to the sunny place.
If the nitrogen fertilizer is applied too much, the branches and leaves will grow luxuriantly. In addition, the branches and leaves will be short of light due to long-term untrimmed, which will easily cause the leaves to turn yellow and fall. We should apply fertilizer reasonably and strengthen pruning to make it ventilated and transparent.
Finally, it should be mentioned that the yellow leaves of potted flowers are sometimes caused by the lack of elements, and the judgment and prevention of the lack of flower nutrition.
Nitrogen deficient plants are thin and weak, branches are slender and hard, leaves and flowers are small. The color of leaves changes from old leaves to new leaves, from thick green to light, then red purple, until withering and falling off. In serious cases, the whole plant loses green.
The control method is to increase the application of rotten human manure, cake fertilizer, manure or ammonium sulfate, urea, ammonium nitrate and other fertilizers.
Phosphorus deficiency leaves changed from dark green to copper, and veins (especially petioles) were yellow with purple. The flower bud is difficult to form, and the flower is small and light, which leads to poor fruit development and even early withering.
In the control method, bone meal, fish meal, poultry fertilizer or superphosphate, ammonium phosphate, potassium phosphate (P, K compound fertilizer) were added. Generally, 0.10% aqueous solution was used as the external topdressing.
Potassium deficient plants are short and the stems are soft and prone to lodging. The leaves often shrink, the old leaves appear dark brown spots along the edge of the leaves from the tip, yellow around the leaves, and the middle and pulse of the leaves are still green.
The control method is to increase the application of plant ash, 1% - 2% potassium chloride solution (not for bulbous and tuberous flowers), 0.30% - 0.50% potassium nitrate solution as external topdressing, and inorganic fertilizer such as potassium phosphate.
What is the yellow leaf
Calcium deficient tender leaves are green and crinkled, with white stripes on the leaf margin. Flowers are blocked, and new leaves are difficult to unfold or distort.
In the first half month of sowing or potting, appropriate amount of calcium chloride is applied to the soil, which can increase calcium and disinfect (avoid acid flowers), and calcium nitrate can also be used as topdressing.
The growth of magnesium deficient plants was not vigorous. From the bottom to the top, the old leaves gradually lose green and turn white from the edge to the center, there are various spots on the veins, and finally the whole leaves turn yellow.
The control method is to spray 0.20% - 0.40% magnesium sulphate solution for 3-4 times, 7-10 days apart. 5-10 kg of magnesium sulfate is used per mu in the soil with serious magnesium deficiency, which is mixed with base fertilizer in autumn or winter.
The leaves with sulfur deficiency begin to turn yellow from vein to whole leaf, and the root system develops abnormally.
Iron deficiency from young leaves to old leaves.
0.30% ferrous sulfate aqueous solution can be used for prevention and treatment of sulfur and iron deficiency for three times in a row, with an interval of one week each time. The spray point shall be fine and uniform. At the same time, 0.20% urea iron solution can be used for external topdressing.