What to do if the leaves turn yellow?

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**.

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.

Causes of yellowing of grape vine leaves: pesticide damage, root disease, nutrient deficiency, fungal disease, fertilizer damage.

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

The root disease will not be yellow in a large area, but the part of the grape plant is yellow, which is relatively sporadic, and it is a problem reflected in the individual or part of the plant, so it is necessary to check whether the root system has rotted or is infestation.

3. Lack of nutrients

Grape plant deficiency is actually the 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. Fungal diseases

Fungal diseases are the appearance of yellow spots, which then slowly spread and cause the leaves to dry up and die, which is the manifestation of fungal infection of the leaves.

5. Fertilizer

Fertilizer damage is because of excessive fertilization, resulting in poor nutrient absorption of the root line, root burning, etc., resulting in the phenomenon of leaf yellowing, 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.

1.Plants lack nitrogen, the old leaves first begin to turn yellow, and then gradually turn yellow from the bottom up, timely supplement urea, ammonium bicarbonate, ammonium sulfate and other nitrogen fertilizers from the roots or leaves, or import high-nitrogen water-soluble fertilizers, you can promote the leaves to turn green.

2.Crops lack phosphorus, the whole plant will turn dark green, and no luster, the leaves will also turn yellow, timely supplement of superphosphate and other phosphorus fertilizers, can promote the leaf to restore luster.

3.Crops, fruit trees, vegetables and flowers are deficient in potassium, the leaves will be uneven, and the edges of the leaves may also turn yellow and withered.

4.Plant iron deficiency, young leaves and old leaves at the same time yellowing, young leaves of the mesophyll yellow, leaf veins green, the formation of a network of yellow leaves, generally watered ferrous sulfate, but the concentration should not be too large, can be applied in stages, to avoid burning roots.

5.Crops lack calcium, young leaves turn yellow and curl, can be applied to crushed egg shells or Ribery Yanwo imported chelated calcium and magnesium fertilizer to reduce the harm.

6.Plants are deficient in magnesium, the leaves turn green and yellow, and finally dry up and die, and calcium, magnesium, phosphorus, and magnesium sulfate fertilizers are applied in time.

7.Crops are deficient in sulfur, leaf veins are yellow, and ammonium sulfate is applied in time to promote the leaves to turn green.

8.In strong alkaline soils, yellowing of leaves will also occur, and acidic fertilizers such as rice washing water and ferrous sulfate can be applied to change the soil environment.

9.Overwatering or stagnant water, the young leaves of the plant turn yellow, excessive drought, the old leaves begin to turn yellow, gradually aggravated from the bottom up, and even the whole plant dies, adjusting the soil moisture can be effectively remedied.

The whole plant is still upper, middle and lower, which part of the yellow, lack of nutrients, drought, drought, flood, pests and diseases, viruses have such a situation, it is best to see what it looks like!