The latest symptoms and causes of iron deficiency in grapes

Grape is a very popular fruit, and the planting area in our country is also very large. However, when we grow grapes, there are often many deficiency diseases, which seriously affect the yield and quality of grapes. Iron deficiency is one of them, so what are the symptoms of iron deficiency in grapes? And what caused it? Today, Xiaobian brought you the symptoms and causes of grape iron deficiency. Let's take a look at it together!

Iron deficiency symptoms

Iron in grape plant form is generally in the form of polymer compounds exist in grape trees will not easily transfer. Therefore, if the grape is iron deficient, it will first appear on the young leaves, and the young leaves will gradually lose green. Except for the veins, the rest of the parts will be completely yellowed, but the old leaves will not be affected. If the symptoms are severe, the leaves will brown and die from the bottom up, then dry and fall off. The growth of new shoots becomes worse, inflorescences yellow and fall off, and the fruit setting rate decreases obviously. It seriously affects the yield and quality of grapes and reduces the planting benefit of farmers.

II. Causes

1. Insufficient iron

Grapes have a greater iron requirement than other fruits and are therefore very sensitive to iron. However, if the planting soil is leached sand with more rainfall, the soil erosion is more serious, and iron elements are easily washed away, resulting in iron deficiency in the soil. And if you have high yields year after year, most of the iron in the soil will be absorbed. And if there is no timely application of iron elements, organic fertilizer dosage is too small, then it will lead to serious iron deficiency in the soil.

2. Soil discomfort

Soil is also a major cause of iron deficiency in grapes, and the availability of iron in soil varies with changes in soil pH. If the soil pH value is about 8 and contains a large amount of calcium carbonate, then the soluble iron salt in the soil will become insoluble, resulting in too high a total iron content in the soil, but lack of available iron, grape roots can not absorb. Moreover, if the soil is too viscous, the irrigation is poor and the temperature is too low, then the divalent iron ions in the soil are easily fixed, resulting in iron deficiency symptoms caused by the inability of grape roots to absorb.

3. Reasons for Fertilization

In June and July of each year, the vegetative growth and reproductive growth of grapes are in the same period. At this time, the demand for fertilizer is also very large, and many fruit farmers are accustomed to applying fertilizer with water, and the fertilizer will be mainly compound fertilizer such as nitrogen, phosphorus and potassium, ignoring the application of iron fertilizer. At the same time, after irrigation, the available iron in the tilled layer of soil will move down due to leaching, resulting in the decrease of available iron content in the dense root area, resulting in iron deficiency symptoms. There is also a nutritional imbalance, such as zinc, copper, magnesium and other trace elements, resulting in antagonism between the elements, affecting the absorption of iron by grape roots.

The above is a brief introduction to the symptoms and causes of iron deficiency in grapes. Today's introduction is here, this article is for reference only, I hope to help everyone oh!