What is the cause of the yellowing of the leaves of the vine, what is missing?

Causes of yellowing of the leaves of the vine:

1. Drug damage. After spraying the grapes, if the grapes have a bad reaction, there will be a large area of yellow leaves, not the old leaves and new leaves, but the yellow leaves in the middle, which usually manifests within 3 to 5 days.

2. Root diseases.

Root diseases do not turn yellow in large areas, but yellowing of the parts of the grape plants, which is relatively sporadic and is a problem manifested by individuals or some plants, so it is necessary to check whether the root system has rotted or is infested.

3. Lack of nutrients. Grape plant deficiency is actually a lack of some micronutrients needed for plant growth, such as magnesium, iron, etc., magnesium deficiency is the yellowing of old leaves, and iron deficiency is yellowing of new leaves.

4. Viral diseases.

The yellowing of grape leaves caused by viral diseases does not have a large area, but occurs sporadically, and the leaf expression is that the leaf veins are yellow, but the middle part of the leaf veins is still green.

5. Fungal diseases.

The difference between fungal diseases and viral diseases is that the shape is different, fungal diseases are the appearance of yellow spots, and then slowly spread to cause the leaves to dry up and die, which is the embodiment of fungal infection of leaves.

6. Fertilizer. Fertilizer damage is because of too much fertilization, resulting in poor absorption of nutrients in the root system, root burning, etc., causing the phenomenon of yellowing of leaves, and most of the yellow leaf problems caused by fertilizer damage are yellowing and drying up from the edge, rather than the center of the leaf beginning to yellow.

Yellowing of grape leaves is due to too little nitrogen fertilization. 1. The amount of fruit hanging in the previous year was large, the fertilization before germination was insufficient, and the nutritional imbalance and lack of nutrients led to the yellow leaf situation.

2. Root system problems, there are few new capillary roots, and nutrients cannot be given to the leaves.

3. The amount of nitrogen fertilizer is too small, and now many people use high-phosphorus and high-potassium fertilizers in the early stage, resulting in uneven application of nitrogen fertilizer.

It is suggested that the underground should be mainly supplemented with rooting and soil supplementation, and the self-nutrient biological fertilizer should be combined with suspended carbon liquid balance water-soluble fertilizer, so that the root nutrition can be replenished and the growth can be restored.

Foliar spraying of medium and trace element fertilizers, such as organic acid boron calcium foliar fertilizer, improve the photosynthesis of plants, promote the supplement of a variety of medium and trace elements, for the reduction of yellow leaves The effect is still good, if the growth is poor, you can add some urea.

The leaves of the vine are yellowish in color, if the new leaves turn yellow, it is iron deficiency, if the old leaves turn yellow, it is magnesium deficiency.

There are many reasons why the amount of absorbable iron in the soil is insufficient:

First of all, the main reason is that the pH value of the soil is too high, and the soil pure hail soil solution is alkaline, mainly oxidation process, so that the iron ions (Fe++) in the soil are precipitated and fixed, and cannot be absorbed by the root system and are lacking.

Second, poor soil conditions, such as heavy soil clay and poor drainage, as well as low and long-lasting ground temperatures in spring, can affect the iron uptake by grape roots.

Third. Excessive tree age, aging of the tree, and large fruiting volume can also affect the absorption of iron by the root system, causing morbidity. Because iron is not transferable in plants, iron deficiency is first manifested in the tender part of the shoot.

Control method: Increase the application of organic fertilizer to reduce the pH value of the soil.

Before the grapes germinate, the soil is supplemented with ferrous sulfate, 50-100 grams of furrow or hole application per plant, and the effect is better if it is mixed with Kuanda organic fertilizer.

Foliar spray: When the grapes have just begun to yellow, spray 600-1000 times "Tianda --- 2116" + ferrous sulfate + citric acid solution to spray the foliar surface carefully, and then spray again every 10-15 days, and spray 2-3 times in a row.

If the new leaves turn yellow, it is iron deficiency, and if the old leaves turn yellow, it is magnesium deficiency. Of course, NPK deficiency can also cause the leaves to turn yellow, but it is not uniform, which can be known by observation. Related to high temperature, according to the season, now is the time to grow better, when the temperature is high and rain, water 1-2 times a day, and fertilize 10 cm from the root.

The leaves of the vine turn yellow, and if it is not excessively wet, a lack of fertilizer should be considered. Apply multi-element compound fertilizer to 1 kg per plant. Combined with the spraying of potassium dihydrogen phosphate or a spray of carbendazim.

The yellowing of the leaves of the vine is generally caused by three reasons, the first is caused by disease, the second is caused by nutrient deficiency, and the third is the normal aging of the leaves.

But the main reason is due to the lack of trace elements such as iron, magnesium and so on in the growth process of the vines. During the growth of grapes, it is possible that there is a deficiency due to uneven fertilization. When fertilizing, can not use a single compound fertilizer, every year should use a sufficient amount of organic fertilizer and trace element fertilizer, supplement the nutrients needed for growth, fertilizer can use organic fertilizer to add calcium, magnesium, iron and zinc trace elements, has appeared yellow leaves, must use foliar fertilizer for spray, can be supplemented with trace elements in a short time.

What to do if the lower leaves turn yellow during the growing season, and what will happen if you don't treat it in time!

First of all, the fertilizer is uneven, the grapes are highly dependent on nitrogen fertilizer, and ignoring the supply of other nutrients will lead to the lack of trace elements such as iron, magnesium, potassium, boron, etc., which will have an antagonistic effect between the elements, which will affect the absorption of nutrients by the plant, and will also pollute the land, causing it to turn yellow and show an unhealthy state. Reasonable fertilization, pay attention to the supplement of trace elements to the plant, whether it is organic fertilizer or inorganic fertilizer, chemical fertilizer or microbial fertilizer should be reasonably combined to ensure that the plant provides comprehensive nutrition. Strengthen the management of water and fertilizer, strengthen the application of organic fertilizer, and water in moderation and moderation.

Also loosen the soil for the plants often. Prune the grape branches and leaves in a timely manner, and pay attention to the prevention and control of diseases and pests after harvesting, so that the leaves remain intact. If it is a new vineyard, it is necessary to pay attention to ditching irrigation before the formal planting to achieve the purpose of reducing the salinity of the soil.

2.Once the grapes have borne fruit, they are subjected to decaying organic fertilizer every two years, preferably at the end of autumn, before the grapes are ready for winter.

3.During the growing season, the grapes should be given a compound fertilizer containing a variety of elements.

4.In the early stages of grape infection, it can be sprayed with ferrous sulphate solution on its leaves**.