What should I do if the leaves of Penglai pine turn yellow?

Question 1: Why does Penglai pine turn yellow? 5 points The reasons why the leaves of Pinus bungeana turn yellow are generally:

First, water resources management:

Too much watering, the basin soil is wet for a long time, which leads to the lack of oxygen in the soil and the decay of some fibrous roots, thus weakening the ability to absorb water and fertilizer, making the tender leaves pale yellow and the leaves gradually dark yellow. Immediately after discovery, control the water, stop fertilization and loosen the soil frequently to make the basin soil breathable. If the disease is serious, take the whole field out of the basin and put it in a dry mound to make the water seep out quickly, and then plant it in the basin again after the drooping branches and leaves recover.

Too little water, or half water or water leakage for a long time, makes the leaf water evaporate more than absorb, resulting in water in short supply and yellow leaves. Drought yellowing gradually turns yellow from the lower leaves, and withered coke falls off. In severe cases, the petiole droops and withers. Immediately after discovery, move the flowerpot to the shade, spray some water on the leaves and pour a small amount of water. Later, as the stems and leaves gradually recover tall and straight, the amount of watering will gradually increase. If too much water is poured suddenly at this time, it may cause cell plasma wall separation, protoplast damage and flower death.

Second, fertilization.

Too much fertilization, especially too much nitrogen fertilizer and lack of phosphorus and potassium fertilizer, is easy to cause the leaves to turn yellow, which shows that the new leaves are thick and irregular, the old leaves gradually turn yellow and fall off, and in severe cases, the tip of the leaves is dry, or even the whole leaves are yellow. In this case, it is necessary to fertilize immediately, increase the amount of watering, and let the fertilizer flow out from the drainage hole, or immediately pour the pot, remove some old soil, wash the soil lump with water, replace it with some new culture soil, and then replant the plants in the pot.

Insufficient fertilization, especially the long-term non-application of nitrogen fertilizer or the failure to change the pot soil, leads to insufficient nitrogen nutrition in the soil, resulting in sparse branches and leaves and yellow leaves. It is necessary to dump the pots in time, remove the plants, replace them with larger pots, put in new loose and fertile culture soil and replant them. After watering, slow down the seedlings in half light. Apply dilute liquid fertilizer or compound fertilizer after it resumes growth.

Three. Soil pH value

Alkaline soil: When planting flowers that like acidic soil in the north, such as camellia, orchid, Michelia, gardenia and osmanthus, because the soil in most parts of the north contains more saline-alkali, flowers and trees will gradually turn green and yellow after a period of cultivation due to the lack of soluble iron that can be absorbed by flowers. At this time, 0.2% ferrous sulfate solution can be poured at intervals, and 0. 1% potassium dihydrogen phosphate solution can be poured alternately at the same time, so that% 26ldquo alkaline yellow% 26rdquo is cured, and potassium dihydrogen phosphate also contains phosphorus and potassium elements, which is beneficial to flower bud differentiation and improves flower quality.

Slight acidity of soil: South China is red loam, and the soil is acidic or slightly acidic, and magnesium in the soil is easy to lose. Because of magnesium deficiency, the leaves between the old leaves and veins often turn green and yellow, and if calcium, magnesium, phosphorus and evergreen are applied, it will be hurt, resulting in the leaves turning yellow and falling off; If the room temperature is lower than 5℃, most flowers that like warmth and fear cold will suffer, and their leaves, flowers and fruits will turn yellow, dry and fall off easily. Therefore, 0. 1% to 0.3% magnesium sulfate solution should be sprayed after entering the room. For the improvement of acidic soil, we should pay attention to the application of decomposed organic fertilizer and lime, which can not only neutralize the acidity of soil, but also promote the decomposition of organic fertilizer.

Fourth, sunshine.

Excessive sunshine: flowers that like semi-shade in summer and are afraid of high temperature and heat, such as asparagus, chlorophytum, clivia, cyclamen, upside-down golden bell, etc. If it is maintained in direct sunlight, it is easy to cause the young leaves or leaf edges to burn or the whole leaves to turn yellow. Once found, it should be transferred to a well-ventilated and cool place for culture.

Insufficient sunshine: if you spend a long time in a place with insufficient indoor light, it will grow weak, the leaves will become thin and yellow, and it will not bloom or rarely bloom. To cultivate this kind of flowers, it is usually necessary to put them in sunny or semi-sunny places outdoors, and then move them indoors for viewing after flowering.

Verb (abbreviation for verb) temperature and humidity

Humidity: In winter in the north, the indoor air is dry because of heating with heating or raw coal. Some flowers that like air humidity, such as orchids and bamboos, are prone to dry tips or scorched leaves, scorched spots and curling on the leaves. Therefore, we should always spray branches and leaves with warm water close to room temperature, and put a basin of clear water on the radiator or stove to increase the indoor air humidity. For some precious flowers, it is best to cover them with plastic film at night and locally scorch the leaves.

Temperature: It is cold in winter in the north. If the room temperature is lower than 8℃, some flowers like high temperature, such as poinsettia, alternate leaves, Phyllanthus urinaria, malachite bamboo, flowers and leaves, etc., adjust the indoor temperature according to the temperature requirements.

Six, pests and diseases

When flowers are infected by fungi, viruses and other pathogens, it will cause a variety of leaf spot diseases, cause local tissue necrosis of leaves, appear chlorosis spots or mottles embedded with yellow and green, or the whole >>

Question 2: What should I do if the leaves of Penglai pine turn yellow and fall? Is Penglai pine a kind of pine tree? If the pine leaves turn yellow, it may be hopeless. Did you water a lot after the sun?

Question 3: What should I do if the leaves of Penglai pine turn yellow? Plant species: juniper.

The cause of yellow leaves:

(1) Insufficient light. It likes plenty of light and can't shade all year round. Of course, it is also possible to put it in a place where it needs to be observed for a few days.

② Improper watering. Should be watered after the topsoil is dry, that is, it can not be wet or stagnant, nor can it be watered to half.

③ Soil problems. If there are holes and gaps in the lower soil, it will seep out quickly after watering, and the soil can't be completely watered, and it will dry after watering every day; In addition, if the lower part is not soil, but other things, such as large pieces of slag, foam, stones and so on. You should be careful. I suggest you pour it out and have a look, then use coarse sand grains as the bottom 2 cm, plus the prepared sandy nutrient soil. It is best to add some decomposed organic fertilizer to the soil.

Question 4: What should I do if the leaves of Penglai pine turn yellow? The soil should become hard and loose. Don't water it too much.

Question 5: How about the yellow leaves of Penglai pine? If you put it in a well-lit place, normal maintenance will be fine. Stop digging. Change the big pot in April next year, and pour some phosphorus and potassium fertilizer 1 month after changing the pot!

Question 6: The leaves of Pinus bungeana gradually turn yellow and rot. Can you feed it? Penglai pine is not watered every day. Penglai pine needs different water in different growth stages. It is enough to keep the soil dry during the dormancy period, and it needs enough water during the spring and summer growth period, but the basin soil can't accumulate water, otherwise it will rot and fall off leaves, and it can be kept moist.

Question 7: Penglai pine has sprouted several branches. Why do the old leaves turn yellow and fall off? There are many reasons. First look at whether the soil is too wet or too dry! How about fertilization! Excessive fertilization or lack of fertilizer will cause this, and the air circulation is already temperature!

Question 8: Why are the leaves of Penglai pine in the living room flourishing and the yellow leaves in the bedroom need photosynthesis?

Question 9: What happened to Penglai Song? As soon as you touch the yellow place, the leaves fall like rain. Before watering, feel the water content in the soil with your hands, then weigh the flowerpot to find out the watering rule.

Question 10: Why does Penglai pine lose its leaves when touched lightly? For plant varieties that like warmth, fear high temperature and like sunshine, they should be scattered in places with good light, so that they can maintain sufficient light in winter and spring.

The best growth period is from March to May. When watering, it is necessary to alternate dry and wet, because it is not drought-tolerant! !