What is the reason for an orange tree to be languished? Why do my orange trees drop a lot of fruit?

Physiological yellowing is a problem that you must face on the road to growing citrus, because it indicates the beginning of the decline of the tree, and then the decline in yield, fruit decline, and shortening of the production life will follow, especially harmful.

When talking about this problem, many orange farmers reflect that yellowing starts from the leaf veins, and then develops to the whole leaves. We all know that in addition to playing a supporting role, leaf veins are also important tissues in the leaf that transport water and nutrients, so it is not surprising that after a leaf vein problem, the leaf will become yellow and thin.

But the key question is, why do citrus veins turn yellow?

Let's start with nutrient deficiency.

When citrus is deficient, the leaves will have corresponding symptoms. For example, the yellowing of the flowers and leaves when there is a lack of manganese and zinc, and then the iron deficiency of the new shoot mesophyll is all yellow, and the leaf veins are green.

Is there a deficiency disease that is strongly related to leaf veins? Yes, nitrogen deficiency and boron deficiency are bore.

The above figure shows a typical symptom of citrus nitrogen deficiency, which is manifested by the green loss of old leaves along the leaf veins, and the greening loss is relatively symmetrical and uniform, and the whole leaf gradually yellows.

It is understood that the main reason for yellowing is that the orchard has more fruit and no winter fertilizer has been applied in the previous year, and the fertilizer demand before spring shoot extraction has risen, especially the demand for nitrogen fertilizer, which shows that the old leaves lack nitrogen and fall leaves are serious.

However, at current fertilization levels, nitrogen deficiency is still rare, so it can only be seen as a small fraction.

In addition to nitrogen deficiency, many data write that boron deficiency can cause leaf vein abnormalities, generally gross cracking (vascular tissue growth disorder) as shown in the figure above, and there is still a certain gap with yellowing, which is not representative.

The reason specifically mentioned here is that not only boron deficiency, but also severe magnesium deficiency can cause leaf vein cracking. From left to right, navel orange magnesium deficiency, navel orange boron deficiency, and navel orange boron-magnesium deficiency syndrome are respectively.

The law of leaf vein cracking is the "V" type macular vein dehiscence when magnesium deficiency occurs, the simple boron deficiency is the main vein dehiscence, and the boron-magnesium deficiency is the whole leaf vein dehiscence. It is necessary to pay attention to identification, targeted correction, and boron supplementation if the leaf veins are cracked, which may cause citrus boron poisoning.

A common problem that causes yellowing of leaf veins.

Yellowing of citrus caused by improper circumcision.

Yellowing of paddy field citrus.

Yellowing of citrus caused by unrotted organic fertilizer.

Yellowing of mountain citrus.

The above are some of the cases of citrus leaf veins that the author has collected, although the causes are different, they all show a common problem - root damage.

For example, improper circumcision can cause root starvation, paddy fields are prone to water accumulation and cause long-term lack of oxygen to the root system, unrotted organic fertilizer burns roots, and it is difficult to maintain soil and water in mountainous areas.

Since the aboveground and underground parts of citrus are an organic whole, when the root system has a problem, the aboveground part also shows corresponding characteristics, and the leaf veins are the transportation channel of fertilizer and water, which may be the first to have problems, and then the whole leaf turns yellow and falls off seriously.

In addition, such as root rot and nematode disease, which can damage the root system, the above-ground parts will also have similar symptoms. Of course, viral diseases such as citrus recession disease can also cause obvious yellowing near the main and lateral veins of leaves, but the mechanism is different, so it will not be discussed here.

Some food for thought. In the face of citrus.

The orange tree does not grow new leaves, which may be due to the agglomeration of the planting soil, which is not suitable for the growth of the orange tree, or it may be that the water or nutrients provided to the plant during the maintenance of the orange tree are improper, resulting in the poor growth of the orange tree, or it may be that the orange tree receives too much light during the growth process, resulting in the new leaves of the orange tree being burned and unable to grow normally.

The reason why orange trees don't grow new leaves.

1. The soil is unsuitable.

What is it about the orange tree that does not grow new leaves.

The fact that the orange tree does not produce new leaves may be the cause of the soil. Orange trees are suitable for growing in the soil with rich trace element content and good drainage, if the soil for planting orange trees is agglomerating, it will cause the orange trees to be unable to absorb nutrients and grow new leaves, so the maintenance of orange trees in the later stage needs to replace the soil and replant them.

2. Overwatering.

The orange tree does not grow new leaves, or it may provide too much water for the orange tree during maintenance, resulting in water rot at the roots of the orange tree, and it is impossible to grow new leaves smoothly, so it is necessary to water the plant reasonably when maintaining the orange tree in the later stage, and it is best to water the water in the soil when the soil is dry and soak all the soil.

3. Insufficient fertilization.

Orange trees do not grow new leaves may also be the orange tree in the process of growth to absorb too little nutrients, resulting in the orange tree does not have enough nutrients for the growth of new leaves, so in the later maintenance of orange trees need to provide reasonable nutrients, it is best to provide orange trees with nitrogen, phosphorus and potassium compound fertilizer, so that the plant absorbs balanced nutrients.

4. The light is too strong.

Orange trees are suitable for growing in a sunny environment, but when the orange tree grows new leaves, the light received is too strong, which will cause the new leaves of the orange tree to be burned by strong light and cannot grow, so it is necessary to provide suitable light for the plant when maintaining the orange tree in the later stage, and the orange tree needs to be shaded in time when the light is too strong.

This is because of the lack of nutrients, so we need to fertilize him properly.

Due to the limited potting soil, if the nutrients are insufficient, the growth needs of the orange tree will inevitably be affected. Orange trees prefer loose and fertile slightly acidic soil, and most of the orange trees that have just been bought from the flower market in spring come with a black nutrient bowl that needs to be repotted immediately. Families should choose a slightly larger pot for orange trees, and it is recommended to mix humus soil (or pine needle soil), garden soil and river sand (or perlite) according to 3:

2:1 ratio configuration. In order to ensure that the orange tree has sufficient nutrients during the growth period**, an appropriate amount of compound fertilizer or rotten chicken manure and sheep manure can be added to the bottom of the pot before potting.

After potting, water thoroughly, put it in a cool and ventilated place for a week to maintain normally.

Orange trees are shade-tolerant, but they also prefer plenty of light, and it is difficult for long-term shade or insufficient light to make orange trees bloom and bear fruit. If you want orange trees to bloom and bear fruit, timely pruning is indispensable, pruning is mainly to regulate the reasonable distribution of tree nutrients, so that the limited nutrients can be supplied to buds and leaves, and promote the differentiation of flower buds. It is generally recommended to carry out a re-pruning before spring shoot germination to cut off dead branches and fallen leaves, inward-looking branches, crossed branches and weak branches.

For strong branches and weak pruning, leave 2 or 3 strong bud points to promote each branch to produce more robust spring shoots. After the spring shoots grow together, in order to control their length, they can be lightly pruned and cut off the 3 4 knots of the branches. In the future, the new shoots that grow will be topped when there are 5 or 8 knots, mainly to induce more summer shoots.

1. The soil is unsuitable.

The fact that the orange tree does not produce new leaves may be the cause of the soil. Orange trees are suitable for growing in the soil with rich trace element content and good drainage, if the soil for planting orange trees is agglomerating, it will cause the orange trees to be unable to absorb nutrients and grow new leaves, so the maintenance of orange trees in the later stage needs to replace the soil and replant them.

2. Overwatering.

The orange tree does not grow new leaves, or it may provide too much water for the orange tree during maintenance, resulting in water rot at the roots of the orange tree, and it is impossible to grow new leaves smoothly, so it is necessary to water the plant reasonably when maintaining the orange tree in the later stage, and it is best to water the water in the soil when the soil is dry and soak all the soil.

3. Insufficient fertilization.

Orange trees do not grow new leaves may also be the orange tree in the process of growth to absorb too little nutrients, resulting in the orange tree does not have enough nutrients for the growth of new leaves, so in the later maintenance of orange trees need to provide reasonable nutrients, it is best to provide orange trees with nitrogen, phosphorus and potassium compound fertilizer, so that the plant absorbs balanced nutrients.

4. The light is too strong.

Orange trees are suitable for growing in a sunny environment, but when the orange tree grows new leaves, the light received is too strong, which will cause the new leaves of the orange tree to be burned by strong light and cannot grow, so it is necessary to provide suitable light for the plant when maintaining the orange tree in the later stage, and the orange tree needs to be shaded in time when the light is too strong.

Many fruit farmers will have abnormal growth problems of fruit trees during planting, such as slow growth, underdeveloped root system, less flowering and fruiting or no flowering.

Young trees grow slowly:

After planting, the seedlings have few shoots, or even no shoots, the leaf color is dark and dull, and they lack vitality, and most of them are dug too deep when planting, resulting in the phenomenon of stuffy roots.

Remedial measures: dig up and replant, so that the top root is close to the soil surface, then fill the soil, and apply fertilizer water containing rooting effect, such as Bond first root strong and gold Shibao organic matter water-soluble fertilizer rich in medium and trace elements, once every 15 20 days, to promote rooting.

Flowering more, bearing less fruit, or not bearing fruit from age-appropriate trees:

There is a phenomenon that the flowers are in full bloom in the spring, and only one basket of fruits is picked in the winter.

The main reason is --

1) Seedling scion is harvested from unfruitful young trees or summer shoots with long branches;

2) Wenzhou mandarin orange was used as rootstock, which grew vigorously, and the age of the fruit was 2 to 3 years later than that of citrus aurantium anvil.

3) The orchard did not expand the hole and change the soil all the year round, the root distribution was shallow, the orchard was waterlogged in spring, the orchard was dry in autumn and winter, the root system could not get water, and the leaf rolling, leaf fall, fruit drop, tree weakness, frost damage seriously affected the flower bud differentiation of the fruiting mother branch;

4) Insufficient nitrogen fertilizer or improper fertilization period leads to the rapid growth of spring shoots and a large number of flowers and fruits.

Remedial measures: mainly do a good job of expanding holes and changing soil, deep ploughing and turning over soil, increasing organic fertilizer, balanced combination of organic and inorganic fertilizers, increasing soil fertilizer and other technical measures can obtain high yields.

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Yellow and deciduous leaves:

1) Low temperature in winter, poor root vigor, coupled with low nitrogen content in the leaves after fruiting, poor root absorption capacity, and yellowing of leaves. The remedy is to apply a fast-acting fertilizer 10 to 15 days before fruit picking, or to spray 1000 times the liquid of Bond Shouye Strong, whose strong leaf regreening formula can reduce the yellow leaves of fruit trees.

2) Drought or high temperature sudden irrigation causes yellow leaves to fall off. The precaution is to irrigate in the evening during hot and dry conditions.

3) Rusty ticks, spider mites, cankers and other pests and diseases cause defoliation. The precautionary measure is to control pests and diseases in a timely manner.

This is normal, plants generally grow worms and get sick, and when they grow worms, they need to use drugs to kill insects, otherwise they will die due to the destruction of the leaves by pests. Generally, use dimethoate to spray the whole plant to kill insects according to the instructions for use or the dosage taught by the boss. This medicine is toxic and used with caution.

You need fertile land, and it should have plenty of rain. Also be sure to prune the orange tree, if you don't prune it all the time, it will only grow taller. It won't go any longer, so this one still has to be pruned well

This is because its nutrition has not kept up, in the orange, the density of the tree is quite dense.

The main reasons for citrus fruit drop are the following points (for reference only): 1. Insufficient tree nutrition: insufficient nutrients during the development of young fruits, which will cause physiological fruit drop in the later stage, and water and fertilizer nutrition should be supplemented in time after flowering.

2. A large number of summer shoots: the extraction of summer shoots competes with young fruits for nutrients and water, and reduces the gibberellin in the fruiting branches, thus causing fruit drop, which should be removed in time when the summer shoots are 3 5 cm. 3. Serious occurrence of pests and diseases

Orchards with serious pests and diseases such as red and rust spiders, leaf rollers, cankers, and anthracnose often have fruit drops, so attention should be paid to the timely prevention and control of large outbreaks of pests and diseases. 4. Improper management: too high fertilizer concentration can cause root damage, and too high spraying concentration can cause fruit drop.

It should be noted that fertilization should be applied scientifically and rationally in strict accordance with the instructions or under the guidance of technical personnel.

It will definitely grow, as long as there is water, the temperature and humidity are right, as long as you put it in moist soil, don't let it dry out, and it will sprout.

It is generally not possible to grow your own at home.